Rules of engagement

Chess, without the waiting

Both players may move whenever their own three-second cooldown has elapsed. The server accepts moves one at a time in arrival order and rechecks each move against the live board.

What stays standard

Piece movement, captures, promotion, castling, king safety, check, checkmate, stalemate, repetition and insufficient-material draws remain.

What changes

There is no side to move. After your move is accepted, only your side cools down. If the board changes before your move reaches the server, it is accepted only when it remains legal.

Check

Check does not reset or bypass a cooldown. When your side can move, only a legal check evasion is accepted. Kings are never captured.