Queen vs Rook: The Ponziani Perpetual Check
Black to play and draw, after Ponziani
PlayA queen beats a lone rook, but here your rook holds the draw on its own. The rule: give check on every move, from a square where the rook cannot simply be taken. Your king never moves. It guards e7, f7 and g7, so a check from there is safe. From any other square, check only where taking the rook is stalemate.
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Rook versus Queen: Ponziani's Perpetual
Black to play and draw · Hold the draw against perfect play
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The theory
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A queen wins against a solitary rook. The exceptions are narrow and worth stating precisely: the attacking king escapes the checks neither when taking the rook would be stalemate, nor when stopping the checks would cost the queen.
Ponziani, 1782. The black king on f8 guards f7 and g7, so the rook can check from either square and the white king can never take it. Only Rh7+ starts the chain; every quiet rook move loses.
Why White cannot break it. To end a check he must interpose the queen, which the rook takes, or capture the rook with the queen, which leaves bare kings.
Do not generalize the huddle. A rook parked beside its king with no checks available is Philidor's position, and Philidor's position is lost. The draw here comes from the checks, not from the coordination.
Keep going
Philidor's Position: Winning Queen versus Rook
White to play and win
Two Protected Squares, No Zugzwang
White to play and draw
The Rook Pawn on the Seventh: Only One Protected Square
White to play and win
All 19 queen vs rook positionsFollow the full curriculum (free)