Each player move one piece. There is no turn, it's realtime!
BUT you have to wait until each move, few time for pawns, more time for rooks, bishops and knights, even more time for queens.
Coil members have to wait for half a second less. It's not much, but it can be decisive!
No castling or en passant to simplify the game.
I ran out of time, so no scoreboard or extensive debugging...