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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.
The Barnes Opening (sometimes called Gedult's Opening) is a chess opening where White opens with: . 1. f3. The opening is named after Thomas Wilson Barnes (1825–1874), an English player who had an impressive [1] eight wins over Paul Morphy, including one game where Barnes answered 1.e4 with 1...f6, known as the Barnes Defence.
Due to moving first, White starts the game with the initiative, [2] but it can be lost in the opening by accepting a gambit.Players can also lose initiative by making unnecessary moves that allow the opponent to gain tempo, such as superfluous "preventive" (prophylactic) moves intended to guard against certain actions by the opponent, that nonetheless require no specific response by them.
This is an important prophylactic move by Black, as White is constantly threatening to push d4–d5 to break through in the center. White now has the option of playing either 10.h4 or 10.0-0. A typical line after the former is 10.h4 g4 11.Ne5 h5 12.0-0 Nbd7, 13.Qc2 Nxe5 14.Bxe5 Bg7 with various possible continuations and possibly still a slight ...
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.
Dec. 2—HIGH POINT — When most people see a chess set, they see the individual pieces — the king and queen, the bishops, the knights, the rooks and the pawns. When Larry Cates sees a chess ...