The rules as stated are ambiguous. If there's no check, then there's no checkmate, so what's the win condition? Experimentation indicates that you win when your opponent's king is removed from the board. Is it a draw when both kings are removed on the same turn?
Yes and yes. Thanks for the feedback, I'll make that more clear.
Nice, but its really hard to win even at "easy", or maybe its just hard to unlearn the normal way of thinking for chess. Good fun though.
I probably should make the current "very easy" the default and relabel the difficulty levels. Thanks for the feedback!
Finally won a game on "easy". I also found the right moves to win every time on "very easy".