Lawless: 40 half-moves (i.e 20 full moves) limit is too low. As a consequence, many position, which are still full of life will be declared a draw, e.g. in this game: Dark Chess (andreas vs. Lawless) there were no captures for 28 full moves.

As alternative proposal I would suggest to keep 50-moves rule from the chess, i.e. if no capture or pawn move is made in 50 moves, a player get an option to declare the game a draw. Since players can't know when this occur, the situation should be detected by BrainKing automatically. But instead of automatically ending the game, a new button should appear on the game page: "Declare draw by 50-moves rules". The players then have an option to continue the game or finish it with a draw.