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In chess, prophylaxis consists of a move or series of moves done by a player to prevent their opponent from taking some action. Such preventive moves, or prophylactic moves, aim not only to improve one's position but also to restrict the opponent in improving their own. Many standard and widespread opening moves can be considered prophylactic.
This is a remarkable recreation of the film’s Final Challenge Chess Set, containing 32 highly detailed, molded pieces that replicate the wizards and goblins who fought the epic battle.
Zugzwang (from German 'compulsion to move'; pronounced [ˈtsuːktsvaŋ]) is a situation found in chess and other turn-based games wherein one player is put at a disadvantage because of their obligation to make a move; a player is said to be "in zugzwang" when any legal move will worsen their position.
In the diagram, the clearance sacrifice 1.Rf8+ vacates the f7 square and, after 1...Rxf8 (better than 1...Bxf8 2.Qg8#), White utilizes the battery on the a2–g8 diagonal. After 2.Qg8+ Rxg8 (only move), White has a classic smothered mate with 3.Nf7#, utilizing the f7 square vacated by the clearance sacrifice.
Before chess programs achieved master strength, and then became better than the best humans, adjournment was commonly offered in tournaments. When an adjournment is made, the player whose move it is secretly writes their next move on their scoresheet but does not make the move on the chessboard. Both opponents' scoresheets are then placed in ...
White's fifth move is overprotecting the key c5-square in the Grünfeld Defence, thus aspires to prevent an attack on the pawn centre by c7–c5. The extravagancy of White's idea is that they break at once two opening principles: avoid moving the same piece twice, and avoid placing a knight on the edge of the board.