That's a very good question. I guess though that Op means how much profit/increase will make to our starting portfolio value.
If we start with 1BTC and at the end of the trial/contest period you have 2BTC and i have 1.3BTC, i guess you are the winner.
@Op : I just register to get notification about this Contest. I also hope that this exchanger of yours to be something steady and reliable and not another bubble...
Good luck, i will watch this closely.
Yeah it is so interesting contest with nice prizes as well, hopefully it will go as planned and there will be real winners on this contest as we all know there are too many fake contest in online world. Would be even better if OP can put the prizes on a trusted escrow.