Herlock Sholmes: as far as I understand, two kings and two bishops is automatic draw, and ofering doubling cube is a nonsens.

First of all, there's no such thing as an "automatic draw" in Chess. There are some blitz rules that state that if your opponent runs out of time, you cannot claim a win if you don't have the material to mate, regardless how bad your opponent plays; there are also some rules stating in which situations one of the players may claim a draw - but those are not enforced in BrainKing. Second, I'm not a fool. I picked a situation that's theoretically a draw, but does allow a mate: White: Kc1, Bc3; Black: Ka1, Ba2. Black is in check, a2 is occupied by his own Bishop, b1 and b2 are covered by the white King. Third, how is the "nonsense" part to be coded? A game starts with a doubling cube. At what moment in the game does offering a double lead to BrainKing replying "heh, dude, we're playing with a doubling cube, but obviously, doubling is nonsense, so I'm not going to let you"?