| http://www.w3.org/ns/prov#value | - A fork is a move that uses one piece to attack two or more of the opponent's pieces simultaneously, hoping to achieve material advantage, since the opponent can only counter one of the two threats.A pin is a move which forces one of the opponent's pieces to stay put because moving it would expose a more valuable piece behind it.A skewer is a move which attacks two pieces in a line, similar to a pi
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