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Stephen Richard Burns-Mannion vs John Nunn
Walsall Kipping Jubilee Tournament (1992), Walsall ENG, rd 2, Apr-??
Sicilian Defense: Lasker-Pelikan. Sveshnikov Variation Novosibirsk Variation (B33)  ·  1/2-1/2
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
May-14-07  notyetagm: Position after 27 ♖f1-d1??


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In "John Nunn's Chess Puzzle Book", Dr. Nunn points out that he missed an instant win here with the <DISCOVERED ATTACK> 27 ♗e4-f3!, <SKEWERING> the White e2- and d1- rooks that are lined up diagonally.

(VAR) Position after 27 ... ♗e4-f3!


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The point is that 28 g2x♗f3 ♖e5x♖e2 costs White the exchange and 28 ♖e2x♖e5 ♗f3x♖d1 does not save White either because then his White e5-rook hangs to the Black d6-pawn while his White c2-knight is now <EN PRISE>.

(VAR) Position after 27 ... ♗e4-f3! 28 ♖e2x♖e5 ♗f3x♖d1


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White cannot then simultaneously meet both threats to his e5-rook and c2-knight.

Note that this combination would not be possible were it not for the White c2-knight being <LOOSE> and <DEFENDED ONLY BY OTHER PIECES> (which is equivalent to being <UNDEFENDED>) (one Black c8-rook attacker, one White b3-bishop defender) in the initial position because then 28 ... ♗f3x♖d1 would not be such a problem.

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Featured in the Following Game Collections[what is this?]
27 Rf1-d1 lines up rooks diagonally, 27 - Be4-f3! skewers them
from Do not line up your rook diagonally! by notyetagm
27 ... Be4-f3! unmasks the Black e5-rook, wins material
from DISCOVERED ATTACK! by kishchess
27 ... Be4-f3! unmasks the Black e5-rook, wins material
from DISCOVERED ATTACK! by notyetagm


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