Opposition and Outflanking: Why One File Decides
White to play and win
PlayYou had the opposition, and Black had to give way: he has just stepped aside with Kd7. One file to the left, against the edge, that same opposition would be worth nothing, and the extra room here is what turns the draw into a win.
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Opposition With Room: The d5 Breakthrough
White to play and win · Win against perfect defense
Waking the engine…
The theory
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Opposition is the most quoted idea in pawn endings and the most misunderstood. Holding it is worth nothing on its own. It is worth something only when the board gives you somewhere to go with it.
Only d5 wins. The move looks like a gift, because Black replies cxd5 at once. It is not a gift: after Kxd5, also the only move, the pawn left on the board is the b-pawn, and your king stands in front of it with the black king obliged to give way.
Then outflank. Kc5 is again the only winning move, and after Kb7 only Kb5 keeps it. Once the kings are locked, White walks around the side the defender cannot cover.
The edge version is a draw. Our position "The Opposition Is Worthless Without an Outflank" is the identical structure pushed one file toward the a-file. There the defending king has the edge of the board at his back and White has nowhere to walk around to. The whole difference is a single file of space.
Keep going
Give Both Pawns Away to Save the Game
White to play and draw
Corresponding Squares: One Move Holds, Six Lose
Black to play and draw
Grigoriev 1920: Two Spare Tempi and a Stalemate
White to play and draw
All 68 king & pawn positionsFollow the full curriculum (free)