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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.
Promotion to knight may also be done for defensive reasons. For example, a knight promotion is a standard defensive technique in a rook versus pawn endgame; [48] a 2006 game between Gata Kamsky and Étienne Bacrot shows such a case. [49] White threatens to capture the pawn or checkmate by Rh1 if the black pawn promotes to a queen, rook, or bishop.
(It would still be drawn by perpetual check with the queen on f1 through f4, but it is won with the queen on f5 by the plan of getting the White king to h6, which no longer causes stalemate.) [15] Finally, diagram 3 has the defending king immobilised in the corner by the enemy queen a knight's move away, so the rook may give perpetual check ...
The diagram shows an example checkmate position. The white king is threatened by the black queen; the empty square to which the king could move is also threatened; and the king cannot capture the queen, because it would then be in check by the rook.
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]
A mating pattern where a pinned knight moves, allowing the capture of the player's queen but leading to a checkmate with three minor pieces, occasionally occurs at lower levels of play, though masters would not normally fall for it. According to Bjerke (Spillet i mitt liv), the Légal Trap has ensnared countless unwary players. One author ...
The queen is used to keep the king in front of its pawn. The queen is used to prevent the white queen from becoming active. If the queen is on e5 it will draw against a pawn on h7 and queen on g6 or f7 if the black king is in the far corner. The queen is kept active and in a flexible place. It will be more active on c2 than h7.
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. [1]