A quick question. Could you show some pseudocode of how you handle the bets? Does the acceptor plays any role in the odds?
After creation of a new addresses pair (your address + acceptor address) site generates random secret, shows sha256(secret) to you and waits for your bet. After bet is accepted and game played new random secret generated immediately and site waits bet again.
What are the odds of each individual ring?
Each ring of various diameters and area, respectively, the different probability of shooting to them.
Each ring has a width 0.05 of a target radius. (But 1500% ring and 3500% circle has radius and width 0.025 each.)
My calculations of probability for each ring (from center):
0.0019634954 <- 3500%
0.0058904862 <- 1500%
0.0235619449
0.0392699082
0.0549778714
0.0706858347
0.086393798
0.1021017612
0.1178097245
0.1335176878 <- 65%
0.149225651 <- 50%