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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.
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.
A player may move the king, capture the threatening piece, or block the check with another piece. [1] A king cannot itself directly check the opposing king, since this would place the first king in check as well. A move of the king could expose the opposing king to a discovered check (and, rarely, checkmate) by another piece, however.
In the illustration, White checkmates by forcing the Black king to the edge, one row at a time. The ladder checkmate can be used to checkmate with two rooks, two queens, or a rook and a queen. [18] Checkmate using a queen and rook. 1.Qg5+ Ke4 2.Rf4+ Ke3 3.Qg3+ Ke2 4.Rf2+ Ke1 5.Qg1# [19]
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]
Neither the king nor the rook has previously moved. There are no pieces between the king and the rook. The king is not currently in check. The king does not pass through or finish on a square that is attacked by an enemy piece. Conditions 3 and 4 can be summarized by the mnemonic: A player may not castle out of, through, or into check.
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);
Rook versus pawns: If the rook's king is not near, one pawn draws and two pawns win. If the rook's king is near, the rook wins over one or two pawns and draws against three. Four pawns usually win but the rook may be able to draw, depending on their position. More than four pawns win against the rook. [68]