how can you assure that we are not playing against bots?
well i my self do not like to play with bots and bots cannot exist they always move with a exact timing
and there chat always is off
There does not have to be any pattern. The problem is that it could be a player, but he could just be copying his opponent moves, put them on the software, and them copy the PC move to your site. He will probably win most of his games like this, and will not have any pattern, and will respond to chat etc etc. That is the problem in chess games when you play to win coins.
I would really like to see a platform like this, but it's impossible to prevent players from cheating, that's why I don't think an online chess game for money will ever work.
Good luck on your site though. It looks good.