Topic: Kingcoin: A delightfully simple spin-the-wheel game (that's provably fair) (Read 6366 times)
November 17, 2013, 10:40:56 AM
Is the site down for good?
March 30, 2013, 03:27:38 AM
November 28, 2012
A minimum bet amount of 0.01 is now required (either BTC or points).
A minimum bet amount of 0.01 is now required (either BTC or points).
Can that be lowered, now considering the increased BTC/USD exchange
Additionally, could the default be lowered as well, from 0.1 BTC? At nearly $10 per spin, that's a little high.
March 16, 2013, 11:44:38 PM
You guys officially made me broke XD evil little game
March 16, 2013, 10:35:50 PM
Hello, the website was working for me earlier, but i clicked play, and it comes up as it normally does, but without the spin button. My account is [email protected]. Would appreciate a refund.
EDIT: Just noticed, looked at the bottom and saw "-0.01 BTC available for withdrawal". I have a screenshot of that message if necessary.
EDIT: Just noticed, looked at the bottom and saw "-0.01 BTC available for withdrawal". I have a screenshot of that message if necessary.
March 14, 2013, 07:24:26 AM
Hello
Sanjay has fixed the problem and refund me completely. I think it a problem with the Nexus 7.
Rob
Sanjay has fixed the problem and refund me completely. I think it a problem with the Nexus 7.
Rob
March 13, 2013, 10:16:53 PM
I then logout and login again but all my bitcoins had gone.
Something like this happened to me. There is no e-mail verification and what I learned is I had signed up initially where I had typo'd on my e-mail address. Then when I went to log in the second time, it was a completely different account, with zero balance.
Fortunately I was able to figure out my typo by trying common mistakes I've made before and sure enough one had my funds.
One way you are able to tell if this is what happened is to look at the history.
- http://kingco.in/history.php <-- Click on My Games.
If you played previously and nothing shows now, then you are on a different account. If that is what happened, maybe coolidgecoin can help clue you in as to which e-mail address you might have used.
March 13, 2013, 08:00:59 PM
Hello
I deposit 0.03 on this game, wow 0.02 totally 0.05.
I then logout and login again but all my bitcoins had gone.
This does not seem a fair game to me.
Where did my coins go?
Rob
I deposit 0.03 on this game, wow 0.02 totally 0.05.
I then logout and login again but all my bitcoins had gone.
This does not seem a fair game to me.
Where did my coins go?
Rob
November 28, 2012, 06:02:32 PM
Updates to Kingcoin
November 28, 2012
A minimum bet amount of 0.01 is now required (either BTC or points).
November 28, 2012
A minimum bet amount of 0.01 is now required (either BTC or points).
November 28, 2012, 06:00:42 PM
Hello Sanjay,
This game is quite addicting. I have an uncanny urge to look at advice animals though...
One very minor thing I noticed:
When playing with actual bitcoins, if there is no immediate combo available (i.e. one spin remaining with 2 spins blue, 1 green, and 1 red) the text overlay on the wheel says "Keep spinning! Or sign up and play for real bitcoin!". It doesn't affect gameplay, but I definitely hesitated the first time I saw it.
Correction: I just replicated the message after 2 spins.
This game is quite addicting. I have an uncanny urge to look at advice animals though...
One very minor thing I noticed:
When playing with actual bitcoins, if there is no immediate combo available (i.e. one spin remaining with 2 spins blue, 1 green, and 1 red) the text overlay on the wheel says "Keep spinning! Or sign up and play for real bitcoin!". It doesn't affect gameplay, but I definitely hesitated the first time I saw it.
Correction: I just replicated the message after 2 spins.
Thanks for the feedback, tyrannis! I'll look into the messaging issue you mention.
Sanjay
November 27, 2012, 12:15:11 AM
Hello Sanjay,
This game is quite addicting. I have an uncanny urge to look at advice animals though...
One very minor thing I noticed:
When playing with actual bitcoins, if there is no immediate combo available (i.e. one spin remaining with 2 spins blue, 1 green, and 1 red) the text overlay on the wheel says "Keep spinning! Or sign up and play for real bitcoin!". It doesn't affect gameplay, but I definitely hesitated the first time I saw it.
Correction: I just replicated the message after 2 spins.
This game is quite addicting. I have an uncanny urge to look at advice animals though...
One very minor thing I noticed:
When playing with actual bitcoins, if there is no immediate combo available (i.e. one spin remaining with 2 spins blue, 1 green, and 1 red) the text overlay on the wheel says "Keep spinning! Or sign up and play for real bitcoin!". It doesn't affect gameplay, but I definitely hesitated the first time I saw it.
Correction: I just replicated the message after 2 spins.
November 26, 2012, 03:09:19 PM
Even though you cannot know that the games shown were actually played by other players, each individual player can be sure that his or her own games are correctly shown on that page. As such, if any player notices that his or her own games are not correctly shown, that player can raise a red flag and alert the community.
I think the point is that you could easily add in a bunch of imaginary winning games to make it look like on average the site is performing as advertised. Nobody could prove that the added games weren't real.
It's still interesting to see the list of recent games. I just don't think it really proves anything. (Not like your provably fair hashes do).
Ah, I see. Yep, you're right, I could be making up games in the log to make it look like people are winning (I'm not!).
Sanjay
November 26, 2012, 01:05:43 PM
Even though you cannot know that the games shown were actually played by other players, each individual player can be sure that his or her own games are correctly shown on that page. As such, if any player notices that his or her own games are not correctly shown, that player can raise a red flag and alert the community.
I think the point is that you could easily add in a bunch of imaginary winning games to make it look like on average the site is performing as advertised. Nobody could prove that the added games weren't real.
It's still interesting to see the list of recent games. I just don't think it really proves anything. (Not like your provably fair hashes do).
November 26, 2012, 03:08:40 AM
- The expected value of Kingcoin has increased to be competitive with other games. It is now approximately 0.984.
That's excellent!
- Each game is logged in the database with more details (in case I have to process refunds)
I suppose that isn't really useful as I cannot verify that the plays that weren't mine were actually for other players, so it provides really no value for verification but it was interesting to see someone else's string of luck giving me hope that maybe, just maybe, the next string like that will be mine. :-)
[Edit: History is still there. I'm not sure how I didn't see it before.
- http://kingco.in/history.php ]
Stephen, pardon me, I'm going to comment on your redacted (struck-out) text.
I believe the 100-game history is indeed useful. Even though you cannot know that the games shown were actually played by other players, each individual player can be sure that his or her own games are correctly shown on that page. As such, if any player notices that his or her own games are not correctly shown, that player can raise a red flag and alert the community.Sanjay
November 26, 2012, 02:47:44 AM
Looks to me like you're just showing off that you hit the King slice. 
I've fixed the "disappearing button" issue.
I've fixed the "disappearing button" issue.
Yeah, I was just showing off. Not only did I hit the king slice, but I hit it on my first game while playing for maximum stake...
As for the disappearing button, here's another one that needs fixing: when I run out of funds, the button vanishes:
November 26, 2012, 02:45:00 AM
- The expected value of Kingcoin has increased to be competitive with other games. It is now approximately 0.984.
That's excellent!
- Each game is logged in the database with more details (in case I have to process refunds)
I suppose that isn't really useful as I cannot verify that the plays that weren't mine were actually for other players, so it provides really no value for verification but it was interesting to see someone else's string of luck giving me hope that maybe, just maybe, the next string like that will be mine. :-)
[Edit: History is still there. I'm not sure how I didn't see it before.
- http://kingco.in/history.php ]
November 26, 2012, 02:34:05 AM
I wonder why the king slice is yellow. Wouldn't it be better to make it some colour that's different than all the other slices?
https://i.imgur.com/A3uwO.png
https://i.imgur.com/A3uwO.png
Looks to me like you're just showing off that you hit the King slice.
No, really--thanks. Good feedback. I was going for the King slice to look like "gold," but you're right; it looks too close to yellow. I changed it to purple.
I've fixed the "disappearing button" issue.
Thanks again, dooglus!
Sanjay
November 26, 2012, 01:33:21 AM
I wonder why the king slice is yellow. Wouldn't it be better to make it some colour that's different than all the other slices?
November 26, 2012, 01:01:57 AM
Updates to Kingcoin
November 25, 2012
Some game parameters have changed to benefit the player.
November 25, 2012
Some game parameters have changed to benefit the player.
- The expected value of Kingcoin has increased to be competitive with other games. It is now approximately 0.984.
- Game parameters are as follows: Black slice is 16% of the wheel (used to be 15%), King slice is 1.3% of the wheel (used to not exist), and other slices are a minimum of 15% of the wheel (used to be 10%).
- The maximum number of spins per game is now 5.
- Each game is logged in the database with more details (in case I have to process refunds)
Nice changes.
I just played for quite a long time and was up most of the time. Only playing for play money, but it does seem like the house edge has got smaller.
At one point I got bored and decided to bet the whole lot on a single spin. It told me the max bet was 2 chips, but then I couldn't figure out how to spin after that. I can edit my bet size, but the spin button has vanished:
November 25, 2012, 10:48:30 PM
Updates to Kingcoin
November 25, 2012
Some game parameters have changed to benefit the player.
November 25, 2012
Some game parameters have changed to benefit the player.
- The expected value of Kingcoin has increased to be competitive with other games. It is now approximately 0.984.
- Game parameters are as follows: Black slice is 16% of the wheel (used to be 15%), King slice is 1.3% of the wheel (used to not exist), and other slices are a minimum of 15% of the wheel (used to be 10%).
- The maximum number of spins per game is now 5.
- Each game is logged in the database with more details (in case I have to process refunds)
November 20, 2012, 11:39:58 AM
I think it could be fun if you did a type of freeroll thing. Make an account and if you get up to 50 (or however many) you get .1 chips to play with.
If you drop to -50 (or however many) it'll bump you back to zero.
This could keep people playing on the site longer and make them more likely to invest actual chips.
If you drop to -50 (or however many) it'll bump you back to zero.
This could keep people playing on the site longer and make them more likely to invest actual chips.
November 20, 2012, 05:00:46 AM
Thanks for the refund.
Tried on a faster connection and had less issues, plus I was more careful not to try and play too fast.
Tried on a faster connection and had less issues, plus I was more careful not to try and play too fast.
November 19, 2012, 11:01:15 PM
This is with Chrome browser on Android. This occurs the same under both a mobile device as well as with a tablet (Nexus 7)
Right now the site is a black hole when using my Android mobile (with Chrome). The press on the spin button does do a spin and then the spin button reappears. But the second press causes the button to disappear but no spin occurs. There is no recovery as far as I could tell. This occurs when playing for free as well as if I've signed in and have placed an actual wager (and thus the black hole, you will lose your wager). Something should be done to either disable the game when on a mobile or the game should function on a mobile as well.
My mobile (LG Optimus Elite) is running Android v2.3.7. Incidentally, this same behavior does not occur on a tablet (Nexus 7) running Android v4.2.
I'll put up a "doesn't work on mobile" redirect of some sort asap. I wanted to get a basic version out there to see what the response was (test the waters) before investing in other platforms. But yes, I should at least have a redirect. Sorry for the poor experience.
Sanjay
November 19, 2012, 09:42:04 PM
This is with Chrome browser on Android. This occurs the same under both a mobile device as well as with a tablet (Nexus 7)
Right now the site is a black hole when using my Android mobile (with Chrome). The press on the spin button does do a spin and then the spin button reappears. But the second press causes the button to disappear but no spin occurs. There is no recovery as far as I could tell. This occurs when playing for free as well as if I've signed in and have placed an actual wager (and thus the black hole, you will lose your wager). Something should be done to either disable the game when on a mobile or the game should function on a mobile as well.
My mobile (LG Optimus Elite) is running Android v2.3.7. Incidentally, this same behavior does not occur on a tablet (Nexus 7) running Android v4.2.
November 19, 2012, 03:21:31 PM
I just lost .5 playing this game.
It was a combination of freeze outs and delays clicking New Game. If you click it twice too fast it'll steal your bet.
=(
It was a combination of freeze outs and delays clicking New Game. If you click it twice too fast it'll steal your bet.
=(
Hi, jjustinn--
First off, I am truly sorry you had trouble with the game. I've refunded your account for the full 0.5 BTC. In addition, I've credited you 0.1 BTC for your troubles. Good luck...hope you win!
In the game log, I see only one game where your game didn't complete possibly due to a slow connection. The other games show a legitimate win or loss.
I haven't been able to reproduce the errors you experienced. Are you on a very slow connection?
Anyway, I've refunded your account with 0.5 BTC (plus 0.1 BTC to aplogize). Please try on a reliable connection and let me know how it goes. On my end, I will simulate a slow connection and add some checks to try and prevent this in the future.
I'm really sorry you had a bad experience and hope you give it another shot.
Thanks,
Sanjay
November 19, 2012, 05:00:25 AM
I just lost .5 playing this game.
It was a combination of freeze outs and delays clicking New Game. If you click it twice too fast it'll steal your bet.
=(
It was a combination of freeze outs and delays clicking New Game. If you click it twice too fast it'll steal your bet.
=(
November 17, 2012, 10:27:29 PM
I might add a special slice on the wheel that is a mega-jackpot (10x or 20x). That will give me an easy parameter to tweak in order to adjust the expected value.
That will increase your variance significantly I think, and so also increase your 'risk of ruin'.
If you're thinking of tinkering with the existing payouts, you can quickly calculate the return to player percentage using:
Code:
>>> 1.5*13.23 + 2*11.88 + 2.5*12.26 + 3*7.21
95.885
95.885
and just changing the 1.5, 2, 2.5, and 3 accordingly.
For instance, changing the 3x to 3.5x gives:
Code:
>>> 1.5*13.23 + 2*11.88 + 2.5*12.26 + 3.5*7.21
99.49
99.49
Edit: notice that the 2.5x payout happens slightly more often than the 2x payout. Most games reserve the bigger payouts for rarer events.
November 17, 2012, 06:00:46 PM
November 17, 2012, 05:59:07 PM
Hi, dooglus-- I sent 1 BTC to 146aSkxyXWM4U7jPnsXhVHd1RfohnVDhPx. Enjoy!
Received, thanks.
I played 10 games at 0.1 BTC each:
https://i.imgur.com/07LyB.png
So I kept only 0.6 BTC. Well less than expected.
I asked to withdraw 0.6 BTC, and it appeared to let me, but some seems to be gotten lost in transaction:
https://i.imgur.com/Q8R7j.png
Yep, I include a very small transaction fee.
About taking only 0.6 BTC, looks like you just got unlucky.
Sanjay
November 16, 2012, 07:32:41 PM
Also, I ran my simulator on 1 million plays, and show the average payout over each 10k plays. It seems to suggest the true house edge is more like 4.25%:
Code:
average return over 10000 spins is 0.982250
average return over 20000 spins is 0.971225; average return over last 10000 spins is 0.960200
average return over 30000 spins is 0.972617; average return over last 10000 spins is 0.975400
average return over 40000 spins is 0.967612; average return over last 10000 spins is 0.952600
average return over 50000 spins is 0.968010; average return over last 10000 spins is 0.969600
average return over 60000 spins is 0.965833; average return over last 10000 spins is 0.954950
average return over 70000 spins is 0.963571; average return over last 10000 spins is 0.950000
average return over 80000 spins is 0.960931; average return over last 10000 spins is 0.942450
average return over 90000 spins is 0.960939; average return over last 10000 spins is 0.961000
average return over 100000 spins is 0.960825; average return over last 10000 spins is 0.959800
average return over 110000 spins is 0.959377; average return over last 10000 spins is 0.944900
average return over 120000 spins is 0.958413; average return over last 10000 spins is 0.947800
average return over 130000 spins is 0.958342; average return over last 10000 spins is 0.957500
average return over 140000 spins is 0.959057; average return over last 10000 spins is 0.968350
average return over 150000 spins is 0.958917; average return over last 10000 spins is 0.956950
average return over 160000 spins is 0.959762; average return over last 10000 spins is 0.972450
average return over 170000 spins is 0.960424; average return over last 10000 spins is 0.971000
average return over 180000 spins is 0.960592; average return over last 10000 spins is 0.963450
average return over 190000 spins is 0.960305; average return over last 10000 spins is 0.955150
average return over 200000 spins is 0.959715; average return over last 10000 spins is 0.948500
average return over 210000 spins is 0.960100; average return over last 10000 spins is 0.967800
average return over 220000 spins is 0.960327; average return over last 10000 spins is 0.965100
average return over 230000 spins is 0.960565; average return over last 10000 spins is 0.965800
average return over 240000 spins is 0.960127; average return over last 10000 spins is 0.950050
average return over 250000 spins is 0.959996; average return over last 10000 spins is 0.956850
average return over 260000 spins is 0.959887; average return over last 10000 spins is 0.957150
average return over 270000 spins is 0.959263; average return over last 10000 spins is 0.943050
average return over 280000 spins is 0.959348; average return over last 10000 spins is 0.961650
average return over 290000 spins is 0.959778; average return over last 10000 spins is 0.971800
average return over 300000 spins is 0.959428; average return over last 10000 spins is 0.949300
average return over 310000 spins is 0.959876; average return over last 10000 spins is 0.973300
average return over 320000 spins is 0.959642; average return over last 10000 spins is 0.952400
average return over 330000 spins is 0.959198; average return over last 10000 spins is 0.945000
average return over 340000 spins is 0.959329; average return over last 10000 spins is 0.963650
average return over 350000 spins is 0.959156; average return over last 10000 spins is 0.953250
average return over 360000 spins is 0.958596; average return over last 10000 spins is 0.939000
average return over 370000 spins is 0.958392; average return over last 10000 spins is 0.951050
average return over 380000 spins is 0.958522; average return over last 10000 spins is 0.963350
average return over 390000 spins is 0.958156; average return over last 10000 spins is 0.944250
average return over 400000 spins is 0.957544; average return over last 10000 spins is 0.933650
average return over 410000 spins is 0.957546; average return over last 10000 spins is 0.957650
average return over 420000 spins is 0.957874; average return over last 10000 spins is 0.971300
average return over 430000 spins is 0.958094; average return over last 10000 spins is 0.967350
average return over 440000 spins is 0.958113; average return over last 10000 spins is 0.958900
average return over 450000 spins is 0.958157; average return over last 10000 spins is 0.960100
average return over 460000 spins is 0.957914; average return over last 10000 spins is 0.947000
average return over 470000 spins is 0.957834; average return over last 10000 spins is 0.954150
average return over 480000 spins is 0.957831; average return over last 10000 spins is 0.957700
average return over 490000 spins is 0.957845; average return over last 10000 spins is 0.958500
average return over 500000 spins is 0.958034; average return over last 10000 spins is 0.967300
average return over 510000 spins is 0.958103; average return over last 10000 spins is 0.961550
average return over 520000 spins is 0.957910; average return over last 10000 spins is 0.948050
average return over 530000 spins is 0.958014; average return over last 10000 spins is 0.963450
average return over 540000 spins is 0.958069; average return over last 10000 spins is 0.960950
average return over 550000 spins is 0.958285; average return over last 10000 spins is 0.970000
average return over 560000 spins is 0.957993; average return over last 10000 spins is 0.941900
average return over 570000 spins is 0.957975; average return over last 10000 spins is 0.956950
average return over 580000 spins is 0.958003; average return over last 10000 spins is 0.959600
average return over 590000 spins is 0.958335; average return over last 10000 spins is 0.977600
average return over 600000 spins is 0.958202; average return over last 10000 spins is 0.950400
average return over 610000 spins is 0.958202; average return over last 10000 spins is 0.958150
average return over 620000 spins is 0.958641; average return over last 10000 spins is 0.985450
average return over 630000 spins is 0.958611; average return over last 10000 spins is 0.956750
average return over 640000 spins is 0.958415; average return over last 10000 spins is 0.946050
average return over 650000 spins is 0.958482; average return over last 10000 spins is 0.962800
average return over 660000 spins is 0.958675; average return over last 10000 spins is 0.971200
average return over 670000 spins is 0.958600; average return over last 10000 spins is 0.953650
average return over 680000 spins is 0.958597; average return over last 10000 spins is 0.958400
average return over 690000 spins is 0.958434; average return over last 10000 spins is 0.947350
average return over 700000 spins is 0.958416; average return over last 10000 spins is 0.957150
average return over 710000 spins is 0.958258; average return over last 10000 spins is 0.947200
average return over 720000 spins is 0.958257; average return over last 10000 spins is 0.958200
average return over 730000 spins is 0.958037; average return over last 10000 spins is 0.942200
average return over 740000 spins is 0.958268; average return over last 10000 spins is 0.975100
average return over 750000 spins is 0.958549; average return over last 10000 spins is 0.979400
average return over 760000 spins is 0.958555; average return over last 10000 spins is 0.959000
average return over 770000 spins is 0.958670; average return over last 10000 spins is 0.967400
average return over 780000 spins is 0.958659; average return over last 10000 spins is 0.957800
average return over 790000 spins is 0.958528; average return over last 10000 spins is 0.948300
average return over 800000 spins is 0.958378; average return over last 10000 spins is 0.946550
average return over 810000 spins is 0.958323; average return over last 10000 spins is 0.953900
average return over 820000 spins is 0.958302; average return over last 10000 spins is 0.956650
average return over 830000 spins is 0.958460; average return over last 10000 spins is 0.971400
average return over 840000 spins is 0.958351; average return over last 10000 spins is 0.949300
average return over 850000 spins is 0.958142; average return over last 10000 spins is 0.940600
average return over 860000 spins is 0.957822; average return over last 10000 spins is 0.930600
average return over 870000 spins is 0.957674; average return over last 10000 spins is 0.944950
average return over 880000 spins is 0.957515; average return over last 10000 spins is 0.943700
average return over 890000 spins is 0.957448; average return over last 10000 spins is 0.951500
average return over 900000 spins is 0.957381; average return over last 10000 spins is 0.951450
average return over 910000 spins is 0.957069; average return over last 10000 spins is 0.929000
average return over 920000 spins is 0.957115; average return over last 10000 spins is 0.961300
average return over 930000 spins is 0.957189; average return over last 10000 spins is 0.964000
average return over 940000 spins is 0.957286; average return over last 10000 spins is 0.966300
average return over 950000 spins is 0.957279; average return over last 10000 spins is 0.956600
average return over 960000 spins is 0.957481; average return over last 10000 spins is 0.976650
average return over 970000 spins is 0.957582; average return over last 10000 spins is 0.967300
average return over 980000 spins is 0.957528; average return over last 10000 spins is 0.952300
average return over 990000 spins is 0.957527; average return over last 10000 spins is 0.957450
average return over 1000000 spins is 0.957537; average return over last 10000 spins is 0.958500
average return over 20000 spins is 0.971225; average return over last 10000 spins is 0.960200
average return over 30000 spins is 0.972617; average return over last 10000 spins is 0.975400
average return over 40000 spins is 0.967612; average return over last 10000 spins is 0.952600
average return over 50000 spins is 0.968010; average return over last 10000 spins is 0.969600
average return over 60000 spins is 0.965833; average return over last 10000 spins is 0.954950
average return over 70000 spins is 0.963571; average return over last 10000 spins is 0.950000
average return over 80000 spins is 0.960931; average return over last 10000 spins is 0.942450
average return over 90000 spins is 0.960939; average return over last 10000 spins is 0.961000
average return over 100000 spins is 0.960825; average return over last 10000 spins is 0.959800
average return over 110000 spins is 0.959377; average return over last 10000 spins is 0.944900
average return over 120000 spins is 0.958413; average return over last 10000 spins is 0.947800
average return over 130000 spins is 0.958342; average return over last 10000 spins is 0.957500
average return over 140000 spins is 0.959057; average return over last 10000 spins is 0.968350
average return over 150000 spins is 0.958917; average return over last 10000 spins is 0.956950
average return over 160000 spins is 0.959762; average return over last 10000 spins is 0.972450
average return over 170000 spins is 0.960424; average return over last 10000 spins is 0.971000
average return over 180000 spins is 0.960592; average return over last 10000 spins is 0.963450
average return over 190000 spins is 0.960305; average return over last 10000 spins is 0.955150
average return over 200000 spins is 0.959715; average return over last 10000 spins is 0.948500
average return over 210000 spins is 0.960100; average return over last 10000 spins is 0.967800
average return over 220000 spins is 0.960327; average return over last 10000 spins is 0.965100
average return over 230000 spins is 0.960565; average return over last 10000 spins is 0.965800
average return over 240000 spins is 0.960127; average return over last 10000 spins is 0.950050
average return over 250000 spins is 0.959996; average return over last 10000 spins is 0.956850
average return over 260000 spins is 0.959887; average return over last 10000 spins is 0.957150
average return over 270000 spins is 0.959263; average return over last 10000 spins is 0.943050
average return over 280000 spins is 0.959348; average return over last 10000 spins is 0.961650
average return over 290000 spins is 0.959778; average return over last 10000 spins is 0.971800
average return over 300000 spins is 0.959428; average return over last 10000 spins is 0.949300
average return over 310000 spins is 0.959876; average return over last 10000 spins is 0.973300
average return over 320000 spins is 0.959642; average return over last 10000 spins is 0.952400
average return over 330000 spins is 0.959198; average return over last 10000 spins is 0.945000
average return over 340000 spins is 0.959329; average return over last 10000 spins is 0.963650
average return over 350000 spins is 0.959156; average return over last 10000 spins is 0.953250
average return over 360000 spins is 0.958596; average return over last 10000 spins is 0.939000
average return over 370000 spins is 0.958392; average return over last 10000 spins is 0.951050
average return over 380000 spins is 0.958522; average return over last 10000 spins is 0.963350
average return over 390000 spins is 0.958156; average return over last 10000 spins is 0.944250
average return over 400000 spins is 0.957544; average return over last 10000 spins is 0.933650
average return over 410000 spins is 0.957546; average return over last 10000 spins is 0.957650
average return over 420000 spins is 0.957874; average return over last 10000 spins is 0.971300
average return over 430000 spins is 0.958094; average return over last 10000 spins is 0.967350
average return over 440000 spins is 0.958113; average return over last 10000 spins is 0.958900
average return over 450000 spins is 0.958157; average return over last 10000 spins is 0.960100
average return over 460000 spins is 0.957914; average return over last 10000 spins is 0.947000
average return over 470000 spins is 0.957834; average return over last 10000 spins is 0.954150
average return over 480000 spins is 0.957831; average return over last 10000 spins is 0.957700
average return over 490000 spins is 0.957845; average return over last 10000 spins is 0.958500
average return over 500000 spins is 0.958034; average return over last 10000 spins is 0.967300
average return over 510000 spins is 0.958103; average return over last 10000 spins is 0.961550
average return over 520000 spins is 0.957910; average return over last 10000 spins is 0.948050
average return over 530000 spins is 0.958014; average return over last 10000 spins is 0.963450
average return over 540000 spins is 0.958069; average return over last 10000 spins is 0.960950
average return over 550000 spins is 0.958285; average return over last 10000 spins is 0.970000
average return over 560000 spins is 0.957993; average return over last 10000 spins is 0.941900
average return over 570000 spins is 0.957975; average return over last 10000 spins is 0.956950
average return over 580000 spins is 0.958003; average return over last 10000 spins is 0.959600
average return over 590000 spins is 0.958335; average return over last 10000 spins is 0.977600
average return over 600000 spins is 0.958202; average return over last 10000 spins is 0.950400
average return over 610000 spins is 0.958202; average return over last 10000 spins is 0.958150
average return over 620000 spins is 0.958641; average return over last 10000 spins is 0.985450
average return over 630000 spins is 0.958611; average return over last 10000 spins is 0.956750
average return over 640000 spins is 0.958415; average return over last 10000 spins is 0.946050
average return over 650000 spins is 0.958482; average return over last 10000 spins is 0.962800
average return over 660000 spins is 0.958675; average return over last 10000 spins is 0.971200
average return over 670000 spins is 0.958600; average return over last 10000 spins is 0.953650
average return over 680000 spins is 0.958597; average return over last 10000 spins is 0.958400
average return over 690000 spins is 0.958434; average return over last 10000 spins is 0.947350
average return over 700000 spins is 0.958416; average return over last 10000 spins is 0.957150
average return over 710000 spins is 0.958258; average return over last 10000 spins is 0.947200
average return over 720000 spins is 0.958257; average return over last 10000 spins is 0.958200
average return over 730000 spins is 0.958037; average return over last 10000 spins is 0.942200
average return over 740000 spins is 0.958268; average return over last 10000 spins is 0.975100
average return over 750000 spins is 0.958549; average return over last 10000 spins is 0.979400
average return over 760000 spins is 0.958555; average return over last 10000 spins is 0.959000
average return over 770000 spins is 0.958670; average return over last 10000 spins is 0.967400
average return over 780000 spins is 0.958659; average return over last 10000 spins is 0.957800
average return over 790000 spins is 0.958528; average return over last 10000 spins is 0.948300
average return over 800000 spins is 0.958378; average return over last 10000 spins is 0.946550
average return over 810000 spins is 0.958323; average return over last 10000 spins is 0.953900
average return over 820000 spins is 0.958302; average return over last 10000 spins is 0.956650
average return over 830000 spins is 0.958460; average return over last 10000 spins is 0.971400
average return over 840000 spins is 0.958351; average return over last 10000 spins is 0.949300
average return over 850000 spins is 0.958142; average return over last 10000 spins is 0.940600
average return over 860000 spins is 0.957822; average return over last 10000 spins is 0.930600
average return over 870000 spins is 0.957674; average return over last 10000 spins is 0.944950
average return over 880000 spins is 0.957515; average return over last 10000 spins is 0.943700
average return over 890000 spins is 0.957448; average return over last 10000 spins is 0.951500
average return over 900000 spins is 0.957381; average return over last 10000 spins is 0.951450
average return over 910000 spins is 0.957069; average return over last 10000 spins is 0.929000
average return over 920000 spins is 0.957115; average return over last 10000 spins is 0.961300
average return over 930000 spins is 0.957189; average return over last 10000 spins is 0.964000
average return over 940000 spins is 0.957286; average return over last 10000 spins is 0.966300
average return over 950000 spins is 0.957279; average return over last 10000 spins is 0.956600
average return over 960000 spins is 0.957481; average return over last 10000 spins is 0.976650
average return over 970000 spins is 0.957582; average return over last 10000 spins is 0.967300
average return over 980000 spins is 0.957528; average return over last 10000 spins is 0.952300
average return over 990000 spins is 0.957527; average return over last 10000 spins is 0.957450
average return over 1000000 spins is 0.957537; average return over last 10000 spins is 0.958500
November 16, 2012, 07:29:14 PM
Hi, dooglus-- I sent 1 BTC to 146aSkxyXWM4U7jPnsXhVHd1RfohnVDhPx. Enjoy!
Received, thanks.
I played 10 games at 0.1 BTC each:
So I kept only 0.6 BTC. Well less than expected.
I asked to withdraw 0.6 BTC, and it appeared to let me, but some seems to be gotten lost in transaction:
November 16, 2012, 12:38:45 PM
Btw, dooglus, if you sign up for Kingcoin, let me know your receive address and I'll send you 1.0 BTC to play with to say thanks for this analysis!
I just signed up, but I was confused by the interface. I think I ended up signing up with a blank password.
The signup page doesn't ask for the password twice, like every other signup page in the world does, so I thought it was a login page. You shouldn't allow people to use blank passwords either, I think. I can't find any way of changing my password. Is there a way?
I made another account, this time specifying a password. Its receive address is 146aSkxyXWM4U7jPnsXhVHd1RfohnVDhPx.
Thanks!
I sped up the simulation code - there's no need to shuffle all 1000 spots on the wheel when we only ever use the first 6. It's still pretty slow, being written in Python and all, but I got another result:
average return over 100000 spins is 0.961925
Also, I couldn't find a way to get rid of the big grey 'Send to this address to play for real BTC!' box that popped up showing me my deposit address. Eventually I found a slightly differently grey coloured X somewhere near the top right corner, but not close enough to the corner to really look like a 'close' button. That closed the dialog, but it's pretty hard to notice it given its low contrast and unusual positioning.
Hi, dooglus-- I sent 1 BTC to 146aSkxyXWM4U7jPnsXhVHd1RfohnVDhPx. Enjoy!
Sanjay
November 16, 2012, 12:32:04 AM
I just noticed on http://kingco.in/history.php your verify links are using the bitZino verifier directly, rather than your own.
I don't know whether that's cool (using a 3rd party to verify your results makes the verification more believable) or rude (did you ask their permission?). Probably it's both...
I don't know whether that's cool (using a 3rd party to verify your results makes the verification more believable) or rude (did you ask their permission?). Probably it's both...
For the record, it's definitely cool with us
The proliferation of provably fair games is good for bitcoin and it just good in general, so I'm all for it! November 15, 2012, 02:31:13 PM
I just noticed on http://kingco.in/history.php your verify links are using the bitZino verifier directly, rather than your own.
I don't know whether that's cool (using a 3rd party to verify your results makes the verification more believable) or rude (did you ask their permission?). Probably it's both...
I don't know whether that's cool (using a 3rd party to verify your results makes the verification more believable) or rude (did you ask their permission?). Probably it's both...
November 15, 2012, 02:25:14 PM
Also, I couldn't find a way to get rid of the big grey 'Send to this address to play for real BTC!' box
Once I did get rid of the box, the 'click to refresh balance' popup appeared. It stayed up as I moused over the 'add btc' button, leading to this ugly mess:
It would be better to close the other popup before opening the new one, so only 1 ever shows up at a time.
November 15, 2012, 02:19:59 PM
Btw, dooglus, if you sign up for Kingcoin, let me know your receive address and I'll send you 1.0 BTC to play with to say thanks for this analysis!
I just signed up, but I was confused by the interface. I think I ended up signing up with a blank password.
The signup page doesn't ask for the password twice, like every other signup page in the world does, so I thought it was a login page. You shouldn't allow people to use blank passwords either, I think. I can't find any way of changing my password. Is there a way?
I made another account, this time specifying a password. Its receive address is 146aSkxyXWM4U7jPnsXhVHd1RfohnVDhPx.
Thanks!
I sped up the simulation code - there's no need to shuffle all 1000 spots on the wheel when we only ever use the first 6. It's still pretty slow, being written in Python and all, but I got another result:
average return over 100000 spins is 0.961925
Also, I couldn't find a way to get rid of the big grey 'Send to this address to play for real BTC!' box that popped up showing me my deposit address. Eventually I found a slightly differently grey coloured X somewhere near the top right corner, but not close enough to the corner to really look like a 'close' button. That closed the dialog, but it's pretty hard to notice it given its low contrast and unusual positioning.
November 15, 2012, 01:55:14 PM
According to some simulations I've run, the house edge for this game is around 4%:
average return over 20000 games is 0.965675
average return over 20000 games is 0.951625
average return over 20000 games is 0.961850
average return over 100000 games is 0.960370
average return over 20000 games is 0.965675
average return over 20000 games is 0.951625
average return over 20000 games is 0.961850
average return over 100000 games is 0.960370
Code:
#!/usr/bin/env python
import MersenneTwister19937
import random, string
class KingCoin:
def __init__(self):
seed = random.randint(0, 2**60)
self.mt = MersenneTwister19937.MersenneTwister19937(seed)
self.FOUR_DIFFERENT = 3 # 4 different colors in 4 spins
self.SIX_SPINS = 2.5 # 6 spins, any color
self.THREE_IN_ROW = 2 # 3 in a row
self.THREE_OF_FIVE = 1.5 # 3 out of 5 (needs 5 non-black spins to pay)
self.LOSE = 0 # spinning black = lose
def play_once(self):
wheel = '1'*3 + '0'*450
wheel = [150] + map(lambda x: len(x)+100, string.split(self.mt.shuffle_string(wheel), '1'))
n = 0
spots = []
for c in wheel:
spots += c*[n]
if (n == 0):
n += 1
else:
n *= 2
self.spots = self.mt.shuffle(spots)[:6]
s0, s1, s2, s3, s4, s5 = self.spots
# 3 spins
if s0==0 or s1==0 or s2==0: return self.LOSE
if s0==s1 and s1==s2: return self.THREE_IN_ROW
# 4 spins
if s3==0: return self.LOSE
if s0+s1+s2+s3 == 15: return self.FOUR_DIFFERENT
if s1==s2 and s2==s3: return self.THREE_IN_ROW
# 5 spins
if s4==0: return self.LOSE
if s1+s2+s3+s4 == 15: return self.FOUR_DIFFERENT
if s2==s3 and s3==s4: return self.THREE_IN_ROW
c = {}
for i in self.spots[0:5]:
if c.has_key(i):
c[i] += 1
if c[i] == 3: return self.THREE_OF_FIVE
else:
c[i] = 1
# 6 spins
if s5==0: return self.LOSE
if s2+s3+s4+s5 == 15: return self.FOUR_DIFFERENT
else: return self.SIX_SPINS
k = KingCoin()
spins = 100000
sum = 0.0
for i in range(spins):
sum += k.play_once()
print "average return over %d spins is %f" % (spins, sum / spins)
Btw, dooglus, if you sign up for Kingcoin, let me know your receive address and I'll send you 1.0 BTC to play with to say thanks for this analysis!
Thanks,
Sanjay
November 15, 2012, 03:02:34 AM
Does "red, red, yellow, red, red" count as a "3 out of 5" win? It's a 4 out of 5, so I can imagine you might not count it as a win, though that would seem a little harsh.
Yes, that would count as a "3 out of 5 win". Per the official rules:
"3 out of 5: Hit the same color in any 3 of the previous 5 spins. Note that this winning pattern can only be achieved after the wheel has been spun at least 5 times."
I do not say "exactly 3 of the previous 5." But still, good question.
Sanjay
November 15, 2012, 03:01:00 AM
According to some simulations I've run, the house edge for this game is around 4%:
average return over 20000 games is 0.965675
average return over 20000 games is 0.951625
average return over 20000 games is 0.961850
average return over 100000 games is 0.960370
average return over 20000 games is 0.965675
average return over 20000 games is 0.951625
average return over 20000 games is 0.961850
average return over 100000 games is 0.960370
Code:
#!/usr/bin/env python
import MersenneTwister19937
import random, string
class KingCoin:
def __init__(self):
seed = random.randint(0, 2**60)
self.mt = MersenneTwister19937.MersenneTwister19937(seed)
self.FOUR_DIFFERENT = 3 # 4 different colors in 4 spins
self.SIX_SPINS = 2.5 # 6 spins, any color
self.THREE_IN_ROW = 2 # 3 in a row
self.THREE_OF_FIVE = 1.5 # 3 out of 5 (needs 5 non-black spins to pay)
self.LOSE = 0 # spinning black = lose
def play_once(self):
wheel = '1'*3 + '0'*450
wheel = [150] + map(lambda x: len(x)+100, string.split(self.mt.shuffle_string(wheel), '1'))
n = 0
spots = []
for c in wheel:
spots += c*[n]
if (n == 0):
n += 1
else:
n *= 2
self.spots = self.mt.shuffle(spots)[:6]
s0, s1, s2, s3, s4, s5 = self.spots
# 3 spins
if s0==0 or s1==0 or s2==0: return self.LOSE
if s0==s1 and s1==s2: return self.THREE_IN_ROW
# 4 spins
if s3==0: return self.LOSE
if s0+s1+s2+s3 == 15: return self.FOUR_DIFFERENT
if s1==s2 and s2==s3: return self.THREE_IN_ROW
# 5 spins
if s4==0: return self.LOSE
if s1+s2+s3+s4 == 15: return self.FOUR_DIFFERENT
if s2==s3 and s3==s4: return self.THREE_IN_ROW
c = {}
for i in self.spots[0:5]:
if c.has_key(i):
c[i] += 1
if c[i] == 3: return self.THREE_OF_FIVE
else:
c[i] = 1
# 6 spins
if s5==0: return self.LOSE
if s2+s3+s4+s5 == 15: return self.FOUR_DIFFERENT
else: return self.SIX_SPINS
k = KingCoin()
spins = 100000
sum = 0.0
for i in range(spins):
sum += k.play_once()
print "average return over %d spins is %f" % (spins, sum / spins)
Wow, impressive! I did some simulations myself and got virtually the same figures. Thanks for doing this!
November 14, 2012, 04:57:25 PM
According to some simulations I've run, the house edge for this game is around 4%:
average return over 20000 games is 0.965675
average return over 20000 games is 0.951625
average return over 20000 games is 0.961850
average return over 100000 games is 0.960370
average return over 20000 games is 0.965675
average return over 20000 games is 0.951625
average return over 20000 games is 0.961850
average return over 100000 games is 0.960370
Code:
#!/usr/bin/env python
import MersenneTwister19937
import random, string
class KingCoin:
def __init__(self):
seed = random.randint(0, 2**60)
self.mt = MersenneTwister19937.MersenneTwister19937(seed)
self.FOUR_DIFFERENT = 3 # 4 different colors in 4 spins
self.SIX_SPINS = 2.5 # 6 spins, any color
self.THREE_IN_ROW = 2 # 3 in a row
self.THREE_OF_FIVE = 1.5 # 3 out of 5 (needs 5 non-black spins to pay)
self.LOSE = 0 # spinning black = lose
def play_once(self):
wheel = '1'*3 + '0'*450
wheel = [150] + map(lambda x: len(x)+100, string.split(self.mt.shuffle_string(wheel), '1'))
n = 0
spots = []
for c in wheel:
spots += c*[n]
if (n == 0):
n += 1
else:
n *= 2
self.spots = self.mt.shuffle(spots)[:6]
s0, s1, s2, s3, s4, s5 = self.spots
# 3 spins
if s0==0 or s1==0 or s2==0: return self.LOSE
if s0==s1 and s1==s2: return self.THREE_IN_ROW
# 4 spins
if s3==0: return self.LOSE
if s0+s1+s2+s3 == 15: return self.FOUR_DIFFERENT
if s1==s2 and s2==s3: return self.THREE_IN_ROW
# 5 spins
if s4==0: return self.LOSE
if s1+s2+s3+s4 == 15: return self.FOUR_DIFFERENT
if s2==s3 and s3==s4: return self.THREE_IN_ROW
c = {}
for i in self.spots[0:5]:
if c.has_key(i):
c[i] += 1
if c[i] == 3: return self.THREE_OF_FIVE
else:
c[i] = 1
# 6 spins
if s5==0: return self.LOSE
if s2+s3+s4+s5 == 15: return self.FOUR_DIFFERENT
else: return self.SIX_SPINS
k = KingCoin()
spins = 100000
sum = 0.0
for i in range(spins):
sum += k.play_once()
print "average return over %d spins is %f" % (spins, sum / spins)
November 14, 2012, 04:01:03 PM
Does "red, red, yellow, red, red" count as a "3 out of 5" win? It's a 4 out of 5, so I can imagine you might not count it as a win, though that would seem a little harsh.
November 13, 2012, 09:23:03 PM
I would include this kind of detail on the site somewhere, along with what the total 'size' of the wheel is, etc. Then people can calculate (via simulation, if not analytically) the house edge.
I see you're shuffling 450 0's and 3 1's. I saw one wheel where there were no 0's after the 3rd 1. I guess that means the corresponding colour was at its minimum of 10%.
It looks to me like each 0 represents 1/1000th of the wheel, since 10+10+10+10+15 = 55% of the wheel is already accounted for by the fixed size black and the 4 10% minimums leaving 45% represented by the 450 0's you shuffle. I'd like to see this explicitly stated in your 'how it works' section.
November 13, 2012, 09:10:08 PM
Each game, the minimum size of each slice is 10% of the total wheel.
I would include this kind of detail on the site somewhere, along with what the total 'size' of the wheel is, etc. Then people can calculate (via simulation, if not analytically) the house edge.
Edit: I notice the 'division of the wheel' isn't shown in the 'provably fair' section until after my first spin. It could be shown as soon as the division has been revealed graphically, since by then I've already committed to playing and spent my BTC.
November 13, 2012, 06:37:00 PM
It's designed for Chrome and Firefox only. I'll add a message on the site about this.
This is with Chrome browser on Android. This occurs the same under both a mobile device as well as with a tablet (Nexus 7)
November 13, 2012, 06:13:14 PM
I welcome any and all feedback! I plan to make the game even more fun by introducing a daily jackpot, so stay tuned.
There's still this issue, with Android:
from an Android mobile when I login, the logout button isn't clickable for some reason.
The only way to logout is to get to a 0 balance and then a link for logout is shown.
The only way to logout is to get to a 0 balance and then a link for logout is shown.
Ack, my apologies. It's designed for Chrome and Firefox only. I'll add a message on the site about this.
Thanks,
Sanjay
November 13, 2012, 06:12:26 PM
I welcome any and all feedback! I plan to make the game even more fun by introducing a daily jackpot, so stay tuned.
I like it. I only played play money, but didn't do very well.
Do you have any idea what the house edge is?
Hi, dooglus-- It is actually very difficult to compute the house edge because the color slices are of random and variable sizes each game. If Kingcoin becomes popular, I'll figure out the precise odds and post.
Each game, the minimum size of each slice is 10% of the total wheel. The black slice is a constant 15%. The wheel is spun randomly (per the seeds, which are provided by the user but otherwise based on a timestamp), but the precise same location cannot be hit twice (because the wheel is represented as a randomized string of integers (each slice represented by one integer), and the first 6 integers of the string are the outcome of each game). I believe that is all there is to the game!
I'm glad you like the game!
EDIT: Forgot to mention one more thing. I publish each and every paid game's outcome at http://kingco.in/history.php
Thanks,
Sanjay
November 13, 2012, 06:06:26 PM
It appears there is no memory of games that have started.
Specifically, let's say a browser crashes in the middle of a spin. The funds are lost. I can log out and log back in and my funds are lost and it is looking for me to start a new game. I don't see any way to resume from where the crash occurred.
(This happened to me after starting to play with some newly deposited coin.)
Specifically, let's say a browser crashes in the middle of a spin. The funds are lost. I can log out and log back in and my funds are lost and it is looking for me to start a new game. I don't see any way to resume from where the crash occurred.
(This happened to me after starting to play with some newly deposited coin.)
Hi, Stephen-- Let me know how much you lost and your address and I'll refund you. You are right; as of now, you must finish a game once you start it, otherwise you lose the game. I will change this if Kingcoin becomes popular, but right now it seems to be a corner case that probably doesn't merit the time needed to fix.
I do log every game, wager, and outcome (as well as all items required for provability) in my database once the game has started. So even if your browser crashes mid-game, I have a record of it.
EDIT: I apologize for the inconvenience, Stephen!
Thanks,
Sanjay
November 13, 2012, 03:47:27 AM
It appears there is no memory of games that have started.
Specifically, let's say a browser crashes in the middle of a spin. The funds are lost. I can log out and log back in and my funds are lost and it is looking for me to start a new game. I don't see any way to resume from where the crash occurred.
(This happened to me after starting to play with some newly deposited coin.)
Specifically, let's say a browser crashes in the middle of a spin. The funds are lost. I can log out and log back in and my funds are lost and it is looking for me to start a new game. I don't see any way to resume from where the crash occurred.
(This happened to me after starting to play with some newly deposited coin.)
November 13, 2012, 02:28:18 AM
I welcome any and all feedback! I plan to make the game even more fun by introducing a daily jackpot, so stay tuned.
There's still this issue, with Android:
from an Android mobile when I login, the logout button isn't clickable for some reason.
The only way to logout is to get to a 0 balance and then a link for logout is shown.
The only way to logout is to get to a 0 balance and then a link for logout is shown.
November 13, 2012, 12:11:54 AM
I welcome any and all feedback! I plan to make the game even more fun by introducing a daily jackpot, so stay tuned.
I like it. I only played play money, but didn't do very well.
Do you have any idea what the house edge is?
November 06, 2012, 05:45:51 PM
I've built a delightfully simple bitcoin game called Kingcoin (at http://kingco.in) that I'd like to share with the community. Spin a multi-colored wheel and match various patterns (like, hitting the same color three times in a row) to win. You can try it out for free and play for real bitcoins when you're ready. Kingcoin uses a slight modification of Bitzino's technique to prove that it's fair.
http://kingco.in
I welcome any and all feedback! I plan to make the game even more fun by introducing a daily jackpot, so stay tuned.
Thanks,
Sanjay
Updates to Kingcoin
November 28, 2012
A minimum bet amount of 0.01 is now required (either BTC or points).
November 25, 2012
Some game parameters have changed to benefit the player.
http://kingco.in
I welcome any and all feedback! I plan to make the game even more fun by introducing a daily jackpot, so stay tuned.
Thanks,
Sanjay
Updates to Kingcoin
November 28, 2012
A minimum bet amount of 0.01 is now required (either BTC or points).
November 25, 2012
Some game parameters have changed to benefit the player.
- The expected value of Kingcoin has increased to be competitive with other games. It is now approximately 0.984.
- Game parameters are as follows: Black slice is 16% of the wheel (used to be 15%), King slice is 1.3% of the wheel (used to not exist), and other slices are a minimum of 15% of the wheel (used to be 10%).
- The maximum number of spins per game is now 5.
- Each game is logged in the database with more details (in case I have to process refunds)
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