Check is a situation in chess and other chess-like games that describes a king that is threatened by another piece. It is illegal for a king to move into check in the official international rule, which is why the game ends in a draw if there are only two kings, since they can't check each other. It is also illegal for a king to castle to escape check, end up in check, or encounter check while castling. If the king is in check and cannot:
- Capture the threatening piece with your pieces (but the king cannot capture if the opponent threatening piece is defended)
- Put a piece between the king and the threatening piece (blocking a check)
- Move the king to a square that is safe for it
it's checkmate, is when a player cannot get out of check in any of the 3 ways, this ends the game immediately and the player who wins achieves Checkmate and wins the game.
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Chess Move Types Check