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an extra rook is helpful in the "threshold" case, but not otherwise (because two rooks fighting against a queen benefit from the ability to defend each other, but minor pieces against a rook need a rook's help more than the rook needs the help of another rook);
The rook is worth about five pawns. In general, rooks are stronger than bishops or knights and are considered greater in value than either of those pieces by nearly two pawns, but less valuable than two minor pieces by approximately a pawn. Two rooks are generally considered to be worth slightly more than a queen (see chess piece relative value ...
In chess, the exchange is the material difference of a rook for a minor piece (i.e. a bishop or knight). Having a rook for a minor piece is generally advantageous, since the rook is usually more valuable. A player who has a rook for a minor piece is said to be up the exchange, and the other player is down the exchange.
A rook versus a minor piece: normally a draw but in some cases the rook wins, see pawnless chess endgame. A rook versus a minor piece and one pawn: usually a draw but the rook may win. A rook versus a minor piece and two pawns: usually a draw but the minor piece may win. A rook versus a minor piece and three pawns: a win for the minor piece.
A chess piece, or chessman, is a game piece that is placed on a chessboard to play the game of chess.It can be either white or black, and it can be one of six types: king, queen, rook, bishop, knight, or pawn.
A rook is generally worth about two pawns more than a bishop. The bishop has access to only half of the squares on the board, whereas all squares of the board are accessible to the rook . When unobstructed, a rook attacks fourteen squares regardless of position, whereas a bishop attacks no more than thirteen (from one of four center squares ...
Positions with two rook pawns are often a draw. A position with a rook pawn and bishop pawn on the same side of the board is usually a draw if they are not far advanced, but the defense is difficult. Overall, the rook pawn and bishop pawn win in 61% of games. [85] The rook pawn and bishop pawn almost always win if they both reach their sixth rank.
Chess piece relative value – relative value of chess pieces, based on their relative power. Premove – used in fast online games, it refers to a player making his next move while his opponent is thinking about his move. After the opponent's move, the premove will be made, if legal, taking only 0.1 seconds on the game clock.