The f-Pawn Breaks the a8 Fortress
White to play and win
PlayThe same drawn structure, plus one white pawn on f5. Add a g-pawn or an h-pawn instead and nothing changes, because Black just ignores it. The f-pawn wins, and the reason is a single check.
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The f-Pawn Breaks the a8 Fortress
White to play and win · Win against perfect defense
Waking the engine…
The theory
Watch the method: press play to see the winning idea run, or step through it move by move.
The draw depends on the black king holding g7 or h7, where it covers g8 and h8 and keeps your rook chained to a8. Only a bishop's pawn can evict it, because only from f5 does a pawn arrive with check.
A rook stuck in front of its own pawn on the seventh draws, and adding a second pawn does not automatically change that.
The pawn that does nothing. Give White a g-pawn or an h-pawn and Black simply ignores it. His king stays on g7 or h7 and the fortress stands.
The pawn that wins. A bishop's pawn on f5 arrives on f6 with check. The king has to step to f7, out of the corner zone, and now the rook can leave a8 along the eighth rank: Rh8 promotes the pawn, and grabbing on a7 loses the rook to Rh7+.
In this drill the check has to come first. Every rook move on move one throws the win away.
Keep going
The Vancura Position
Black to play and draw
One Tempo Too Late for Vancura
Black to play and draw
Vancura With an Extra Rook Pawn
Black to play and draw
All 83 rook endgames positionsFollow the full curriculum (free)