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Alexey Shirov vs Vasyl Ivanchuk
XXI Magistral Ciudad de Leon (2008) (rapid), Leon ESP, rd 6, May-31
Sicilian Defense: Najdorf Variation (B96)  ·  1/2-1/2



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Kibitzer's Corner
May-31-08  chessenthus: lol again started?
Jun-01-08  Xeroxx: No, not "lol"
Jun-02-08  notyetagm: Position after 21 h2-h4!?

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Here White (Shirov) has just played 21 h2-h4!?, setting up an interesting trap. What happens if Black simply grabs the White h4-pawn with his Black g5-pawn?

(VAR) Position after 21 ... g5xh4??

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By playing the blunder 21 ... g5xh4??, Black has opened the diagonal c1-h6 to his <UNDEFENDED> Black h6-rook. Before opening this diagonal, the <UNDEFENED> Black h6-rook was not really a weakness because it could not be attacked (exploited). After 21 ... g5xh4?? it can be exploited because it can be attacked along the newly opened c1-h6 diagonal, so now it really -is- a weakness.

Black has a second weakness, the Black a5-queen which is almost <TRAPPED ON THE EDGE OF THE BOARD> and would in fact be <TRAPPED> if White could play his dark-squared White d4-bishop to b6.

So how does White exploit these <TWO WEAKNESSES>, the <UNDEFENDED> Black h6-rook and the almost <TRAPPED> Black a5-queen? With the <QUEEN FORK> 22 ♕e2-e3!.

(VAR) Position after 21 ... g5xh4?? 22 ♕e2-e3! <queen fork>

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22 ♕e2-e3! is a <DOUBLE ATTACK> against the <UNDEFENDED> Black h6-rook and the b6-trapping square. White threatens both 23 ♕e3x♖h6 and 23 ♗d4-b6 <TRAPPING> the Black a5-queen, winning material.

In the vocabulary of Weteschnik, 22 ♕e2-e3! is a <DOUBKE ATTACK> in which the <TACTICAL BASE> is the e3-square, one <TACTICAL TARGET> is a piece (<UNDEFENDED> Black h6-rook), and the other <TACTICAL TARGET> is a square (b6-trapping square).

<WETESCHNIK>: -EVERY- square (b6-trapping square) which can be reached from the <TACTICAL BASE> (e3-square) must be considered as a potential second <TACTICAL TARGET>. The e3-square became a <TACTICAL BASE> when Black played 21 ... g5xh4?? and made it possible for the White e2-queen to attack the <UNDEFENDED> Black h6-rook.

Jun-02-08  ughaibu: And 22....Ng4?
Jun-02-08  notyetagm: <ughaibu: And 22....Ng4?>

Perhaps 23 ♕e3-f3, double attacking the <UNDEFENDED> Black g4-knight and the <LOOSE> f7-square next to the Black e8-king.

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Just a quick thought.

Jun-02-08  ughaibu: 23....Qh5

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