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Leonid Stein vs Laszlo Barczay
Sousse Interzonal (1967), Sousse TUN, rd 18, Nov-08
King's Indian Attack: Smyslov Variation (A05)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Jul-18-06  notyetagm: 42 ♖xf7! ♖xf7 43 ♕e7 is a great example of the tactical theme <EXCHANGING ON THE PINNING SQUARE>.

Before the <EXCHANGE ON THE PINNING SQUARE> which starts with White's 42nd move, the f7-pinning square is attacked by two White pieces (d5-bishop, f3-rook) and defended by two Black pieces (a7-rook, g8-king).

After the <EXCHANGE ON THE PINNING SQUARE> 42 ♖xf7! ♖xf7 43 ♕e7, the tactical point is that although White still attacks the f7-pinning square with two pieces (d5-bishop, e7-queen), Black can defend it -only- with his g8-king.

The Black f7-rook is now <FULLY PINNED>, meaning that it cannot leave the square it is on, because it must <BLOCK> the a2-g8 diagonal along which it cannot move. White uses the complete immobility of the Black f7-rook to <PILE ON THIS PINNED PIECE> from a square which it no longer defends.

Hence White (Stein) regains his rook and profits a pawn in the process.

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