The One Thing
The Lucena position wins by promoting the pawn to a queen, forcing a rook trade, then converting the resulting King and Rook vs King endgame.
Chess Endgame · KRKP
White winsLucena Position (Building a Bridge)
For sub-1000 ELO players
The Lucena position is a rook endgame where you have a king, rook, and far-advanced pawn against the opponent's king and rook. The winning technique is straightforward when the pawn is one square from promotion: push the pawn, exchange pieces if necessary, and win with the extra material. Stockfish 17 at depth 25 confirms this position is a forced win in 5 moves.
The Technique
Key Moves
The moves that decide the game
What Happens With Perfect Play
When your pawn is one square from queening and your king supports it, push the pawn and trade pieces. The resulting position is won.
Stockfish confirms the starting position is a forced win for White (+M5).
This technique works for b, c, d, e, f, and g pawns. Rook pawns (a and h files) have special drawing cases -- see the draw exceptions below.
3 Mistakes Sub-1000 Players Make
These are the patterns we see in endgames below 1000 ELO. Fix these and you will stop drawing won games.
Promoting while the enemy rook is on the promotion file
Beginners see the pawn one square from queening and push immediately. But if the Black rook is on the e-file or d-file, it captures the new queen instantly. White must move the rook first or create a safe promotion.
Rd1d8=Q Rxd8 and Black's rook takes the queen. White has only a king and a rook left. The material advantage disappears.
Not knowing when the position is won
Sub-1000 players do not recognize the Lucena position. They play random moves, lose the pawn, or stalemate the enemy king. The technique is simple once you know it.
Rd1White wastes time, Black's rook infiltrates, and the pawn gets captured. A winning position turns into a draw or loss.
Forgetting the piece trade wins
After trading queens (or rooks), beginners think the position is equal. But White still has a rook and Black has nothing. That is a won endgame.
Kxd8If White does not recapture after Rxd8, Black escapes with a rook. Recapture and win the rook endgame.
Key Squares to Know
These are the squares that decide the game. Get your king to these squares and the pawn promotes.
d8Promotion squareThe square where the pawn becomes a queen. Once the pawn reaches d8, White has achieved the goal.
d1Rook support squareThe rook moves here to get out of the way and prepare for the promotion or piece trade.
Engine-verified by Stockfish 17 at depth 25. Theoretical result: White wins. Published by Jon Stenstrom, Chess.com 759 Daily, Founder, 1000elo.com.
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