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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.
The king is the most valuable piece—it is illegal to play any move that puts one's king under attack by an opponent piece. A move that attacks the king must be parried immediately; if this cannot be done, the game is lost. (See § Check and checkmate.) A rook can move any number of squares along a rank or file. A rook is involved in the king ...
The black king starts on e8, directly across from the white king. Each king starts on a square opposite its own color. A king can move one square horizontally, vertically, and diagonally unless the square is already occupied by a friendly piece or the move would place the king in check.
Mayet's mate involves the use of a rook attacking the black king supported by a bishop. It often comes about after the black king castles on its kingside in a fianchetto position. White usually arrives at this position after a series of sacrifices on the a-file or h-file. It is a type of Anderssen's mate and closely resembles the Opera mate.
This is the move that Saavedra introduced. White threatens 7. Ra8+ and mate. Material is even, but the unfortunate positions of Black's king and rook doom him to a loss. 6... Ra4 7. Kb3. Black must either lose the rook (allowing White an elementary checkmate) or be checkmated by 8.Rc1. [3]
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 medieval England, Spain, and France, the white king was allowed to jump to c1, c2, d3, e3, f3, or g1 [14] if no capture was made and the king was not in check and did not move over check; the black king might move analogously. In Lombardy, the white king might also jump to a2, b1, or h1, with corresponding squares applying to the black king.
The two knights endgame is a chess endgame with a king and two knights versus a king. In contrast to a king and two bishops (on opposite-colored squares), or a bishop and a knight, a king and two knights cannot force checkmate against a lone king (however, the superior side can force stalemate [1] [2]).
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