When a pawn advances two squares from its original square and ends the turn adjacent to a pawn of the opponent's on the same rank, it may be captured by that pawn of the opponent's, as if it had moved only one square forward.

A king is in it when it is under attack by at least one enemy piece. A piece unable to move because it would place its own king in it (it is pinned against its own king) may still deliver it to the opposing player.

If a player's king is attacked and there is no legal move that player can make to escape of it, then the game ends, and that player loses.

Either player may do it at any time, conceding the game to their opponent.

The game is automatically it if the player to move is not in check and has no legal move.

It is defined as a position where neither player can win the game by any sequence of legal moves.

If a player advances a pawn to its eighth rank, the pawn is then converted to a queen or other chess piece less a king or another pawn.

How many squares is a chessboard divided?