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The example shown is a helpmate in 2 by Henry Forsberg (published in 1935 in Revista Romana de Şah). The twins are created by substituting the black queen on a6 with a different piece. The solutions are: a) diagram position: 1. Qf6 Nc5 2. Qb2 Ra4# b) with black rook at a6: 1. Rb6 Rb1 2. Rb3 Ra1# c) with black bishop at a6: 1. Bc4 Ne1 2. Ba2 Nc2#
But puzzles can also set different objectives. Examples include deducing the last move played, the location of a missing piece, or whether a player has lost the right to castle. Sometimes the objective is antithetical to normal chess, such as helping (or even compelling) the opponent to checkmate one's own king.
For example, White might play 2.Bc4. In all variations, the basic idea is the same: the queen and bishop combine in a simple mating attack, occurring on f7 for White or on f2 for Black. Scholar's mate is sometimes referred to as the four-move checkmate, although there are other ways for checkmate to occur in four moves.
An enemy pawn or a piece other than a knight is used to restrict the enemy king's movement. It is a type of Anderssen's mate and closely resembles Mayet's mate. The checkmate was named after its implementation by Paul Morphy in 1858 at a game at the Paris opera against Duke Karl of Brunswick and Count Isouard; see Opera game.
In chess, an ideal mate is a checkmate position that is a special form of model mate.While in a model mate, each piece on the mating player's side (possibly excluding the king and pawns depending on context) participates in the mate, an ideal mate involves all the pieces of the mated player's as well, typically by blocking the mated king's field of movement so that it cannot escape.
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.
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A checkmate may occur in as few as two moves on one side with all of the pieces still on the board (as in fool's mate, in the opening phase of the game), in a middlegame position (as in the 1956 game called the Game of the Century between Donald Byrne and Bobby Fischer), [3] or after many moves with as few as three pieces in an endgame position.