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The triangle mate involves a queen, supported by a rook on the same file two squares away, delivering checkmate to a king that is either at the edge of the board or whose escape is blocked by a piece; the queen, rook, and king together form a triangular shape, hence the name of the mating pattern.
A back-rank checkmate is a checkmate delivered by a rook or queen along a back rank (that is, the row on which the pieces [not pawns] stand at the start of the game) in which the mated king is unable to move up the board because the king is blocked by friendly pieces (usually pawns) on the second rank. [45]
The king and rook involved in castling must not have previously moved; There must be no pieces between the king and the rook; The king may not currently be under attack, nor may the king pass through or end up in a square that is under attack by an enemy piece (though the rook is permitted to be under attack and to pass over an attacked square);
In chess, a back-rank checkmate (also known as a corridor mate) is a checkmate delivered by a rook or queen along the opponent's back rank (that is, the row closest to them) in which the mated king is unable to move up the board because the king is blocked by friendly pieces (usually pawns) on the second rank.
The king (♔, ♚) is the most important piece in the game of chess.It may move to any adjoining square; it may also perform, in tandem with the rook, a special move called castling.
Castling is permitted only if neither the king nor the rook has previously moved; the squares between the king and the rook are vacant; and the king does not leave, cross over, or finish on a square attacked by an enemy piece. Castling is the only move in chess in which two pieces are moved at once. [3]
With a rook pawn, usually in actual play the defending rook or king is able to get in front of the pawn. If the defending king gets in front of the pawn, the game is a draw. If the defending rook gets in front of the pawn, the result depends on which king arrives on the scene first. [61] The attacking king or rook may be in front of the pawn.
Generally, moving the rook away from the king loses quickly. The queen plays two roles in breaking down the second-rank defense; it restricts the enemy king's movement and prevents the enemy rook from checking its king from behind. [12] This allows its king to penetrate through to the sixth rank. [8]