Great
It's brilliant to see a half decent chess game on here, and by half decent I mean that the opponant AI is quite challenging, yet not ridiculously difficult.
It's also nice to see that it varies as well, most games like this will keep following the same play pattern if you copy moves from previous rounds.
Great twist on the game by adding the 'executions'.
I agree with a post below, low reviews simply be off people who don't like chess (ie are not very good at it)