The bishop is capable of skewering or pinning a piece, while the knight can do neither. In certain positions a bishop can by itself lose a move (see triangulation and tempo), while a knight can never do so. A bishop and knight can force mate, but with far greater difficulty than two bishops. Two bishops on opposite-colored squares and king can force checkmate against a lone king, whereas two knights cannot. A player possessing a pair of bishops has a strategic weapon in the form of a long-term threat to trade down to an advantageous endgame. In an open endgame, a pair of bishops is decidedly superior to either a bishop and a knight, or two knights. A bishop can easily influence both wings simultaneously, whereas a knight is less capable of doing so. īishops usually gain in relative strength towards the endgame as more pieces are captured and more open lines become available on which they can operate. More experienced players understand the power of the bishop. Less experienced players tend to underrate the bishop compared to the knight because the knight can reach all squares and is more adept at forking. This means bishops are approximately equal in strength to knights, but depending on the game situation, either may have a distinct advantage. Knights and bishops are each worth about three pawns. A king and two bishops on opposite-colored squares, however, can force mate. A king and rook can force checkmate against a lone king, whereas a king and bishop cannot. When unobstructed, a rook attacks fourteen squares regardless of position, whereas a bishop attacks no more than thirteen (from one of four center squares) and sometimes as few as seven (from sides and corners). The bishop has access to only half of the squares on the board, whereas all squares of the board are accessible to the rook. See also: Chess piece relative value and The exchange (chess)Ī rook is generally worth about two pawns more than a bishop.
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