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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.
Philidor's mate, also known as Philidor's legacy, is a checkmating pattern that ends in smothered mate. This method involves checking with the knight forcing the king out of the corner of the board, moving the knight away to deliver a double check from the queen and knight, sacrificing the queen to force the rook next to the king, and mating with the knight.
The opponent’s king being unable to move to any safe square, usually because all escape routes are covered or blocked by the attacking pieces. An example of a mating net might involve a queen and rook working together to corner the enemy king, while other pieces cover any escape squares.
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]
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]
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.
Therefore, in order to get White to move their king to that position, Black drops his rook to the 91 square in a sacrifice move. Since White is now in check and without any safe square for an escape, White must capture the rook with his king. Now, with the king on 91, Black can check the king with a bishop drop to 73. Now the White's king is ...
A queen wins against a lone rook, unless there is an immediate draw by stalemate or due to perpetual check [3] (or if the rook or king can immediately capture the queen). In 1895, Edward Freeborough edited an entire 130-page book of analysis of this endgame, titled The Chess Ending, King & Queen against King & Rook.