Dropping Upon capturing an opponent's piece, you can drop that piece back on the board. You cannot drop if you dropped last turn. You can drop only one piece per turn. You drop instead of moving. You can only drop on an empty square of your castle.
Dropped pieces are in their unpromoted state.
The player on the Queen's side goes first. The King or Queen cannot move into a square which puts it into check. Also called checkmate. If a player's only move is into a check, that player loses. Also called stalemate.