FPS Chess inside ULTRAKILL. Play chess on FPS Chess's own board, in its own room. Every capture is a best-of-three ULTRAKILL duel between the two pieces.
Online 1v1 with a friend (Join through Melty or invite a Steam friend), or practice against the computer, whose pieces are ULTRAKILL enemies.
FPS Chess's VS screen before every duel. Win and you take the square; lose as the attacker and your piece is gone.
No checkmate, as in FPS Chess. You win by taking the enemy king, and a cornered king fights back with everything it has.
Every piece fights differently (each gun with its blue, green and red variants):