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In a chess endgame of a king, bishop, and pawn versus a bare king, or, less commonly, a king, rook, and pawn versus a bishop and king, a wrong rook pawn is a rook pawn (a pawn on the a- or h-file) whose promotion square is the opposite color from the bishop's square color.
A rook and a rook pawn always win against the wrong bishop, as in this position. The defender has the wrong bishop if it is the one on the same color as the pawn's promotion square. The winning procedure is to give up the pawn at the right time to get to a winning rook versus bishop endgame. If the bishop was on the other color, the defender ...
If the pawns are on the opposite color as the defender's bishop, the defender may be able to blockade the pawns and draw. If both pawns can safely reach the sixth rank, they win unless one is the wrong rook pawn, i.e. the rook pawn that promotes on the square of the same color as the defending bishop. [23]
A pawn that advances to its last rank is promoted to a queen, rook, bishop, or knight of the same color. The pawn is replaced by the new piece on the same move. The choice of promotion is not limited to pieces that have been captured; thus, a player could, in theory, have as many as nine queens, ten rooks, ten bishops, or ten knights on the board.
In an endgame with a bishop, in some cases the bishop is the "wrong bishop", meaning that it is on the wrong color of square for some purpose (usually promoting a pawn). For example, with just a bishop and a rook pawn, if the bishop cannot control the promotion square of the pawn, it is said to be the "wrong bishop" or the pawn is said to be ...
Note that the bishop and wrong rook pawn ending (i.e. where the pawn is a rook pawn whose promotion square is the color opposite to that of the bishop) in the diagram is a draw even if the pawn is on the seventh rank or further back on the a-file. Heading for a bishop and wrong rook pawn ending is a fairly common drawing resource available to ...
The Classic Bishop Exchange has Black's rook pawn advanced all the way to the middle rank 5 and White has defended the second file with a gold development. White initiates the standard bishop trade, and then, after Black captures the promoted bishop and White moves their silver up to defend the second file is when the Wrong Diagonal Bishop ...
Being a five-piece endgame, the rook and bishop versus rook endgame has been fully analysed using computers. Endgame tablebases show that 40.1% of the legal positions with this material are theoretical wins, but that includes many unnatural positions that are unlikely to occur in games.