Rook pawn
A rook pawn is a pawn on the a-file or the h-file, the edge of the board, which has fewer capture options and gives the attacker less room to maneuver.
Also called: edge pawn
A rook pawn stands on the a-file or the h-file. Because it is on the edge, it can capture in only one direction and attacks a single square. This limits its use in the middlegame, and it also changes many endgames.
In king and pawn endings, a rook pawn is easier for the defender to stop. If the defending king reaches the corner in front of the pawn, the position is a draw, because the pawn can never get past, and the attacking king cannot dislodge it. With a pawn on another file, the attacker often has room to force the defender away.
Rook pawns also produce stalemate tricks. A defending king shut in on the edge, with the pawn blocking a square, can often be stalemated if the attacker is careless. Several textbook draws rely on this idea, and knowing them can save a lost game.
In rook endings, a rook pawn tends to be drawish, because the attacking king has little room to shelter from checks on the edge side. With a bishop, the color of the bishop matters, as seen in the wrong rook pawn draw.
A common mistake is to push a rook pawn automatically in a pawn ending. Check whether the defender can reach the corner first, and consider whether trading to a different structure gives you better winning chances.
Also worth reading is Queen versus pawn. Queen versus pawn is an endgame in which a queen faces an enemy pawn that is about to promote, and the queen usually wins except against a bishop or rook pawn defended by a nearby king.
It sits close to Vancura position. The Vancura position is a drawing setup against a rook pawn on the sixth rank with its rook in front: the defending rook attacks the pawn from the side, and the defending king waits on the far side of the board.
It sits close to Wrong-colored bishop. A wrong-colored bishop runs on the opposite color to the queening square of its side's rook pawn, so it can never cover that corner or drive out a defending king sitting there, and the ending is drawn.
If "Rook pawn" has cost you half a point, a first lesson is a good place to find the pattern behind it: George Li goes through your games and builds a plan.
Related terms
A wrong rook pawn is an a-pawn or h-pawn whose promotion square is the opposite color to its side's bishop, so king, bishop and pawn cannot win once the defending king reaches the corner in front of it.
Stalemate is a draw that occurs when the side on move has no legal move at all while its king is not attacked, so the game ends on the spot with half a point to each player.
A king and pawn endgame is an ending in which only kings and pawns remain, so the result depends on promotion races, king placement, opposition, and exact counting of moves.
Key squares are the target squares for the attacking king in a pawn ending: once it reaches one while its pawn is safe, the pawn promotes by force, no matter whose move it is.
The short side is the side of a pawn's file that has fewer files between it and the edge of the board, the opposite of the long side where more room is available.
A theoretical draw is a position in which perfect play by both sides leads to a draw, so neither player can force a win no matter how many moves are left.
Guides that go further
What to decide first, the questions to ask, what a first lesson should show and the red flags to avoid.
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A game review, a read on your level and a written study plan from George Li.
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A first lesson starts with your games: George reviews them and builds a study plan around what he finds.