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Yifan Hou vs Michal Vladimirovich Krasenkow
Corus Group C (2007), Wijk aan Zee NED, rd 2, Jan-14
Modern Defense: Two Knights. Suttles Variation (B06)  ·  0-1


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Kibitzer's Corner
Jan-15-07  notyetagm: From

<Down in the C Group, 12-year-old Hou Yifan missed a winning tactic pointed out by the computer: 22.Bxf4 Rxf4 23.Nd5! wins the exchange. Instead she went on to lose to Krasenkow (trying the same tactic a few moves later to little effect).>

Jan-15-07  notyetagm: Hou Yifan missed KNIGHT OPPOSITION (White c3-knight versus Black f4-knight) combined with RELOADING on the d5-square, which is a TACTICAL BASE for -both- the White c3-knight and White g2-bishop.

21 ... ♘f4? 22 ♗xf4 <removes guard of d5-tactical base> ♖xf4 <decoy to f4> 23 ♘d5! <forks ♗lack e7-queen, f4-rook> cxd5 24 ♗xd5+ <the point: White reloads on d5> and 25 ♗x♖a1

RELOAD: one defender (Black c6-pawn) cannot keep two attackers (White c3-knight, g7-bishop) out of d5

KNIGHT OPPOSITION: White c3-knight versus Black f4-knight creates TACTICAL BASES on d5, e2

The White c3-knight has a TACTICAL TARGET in the undefended Black e7-queen, which makes d5 a possible TACTICAL BASE, again using one TACTICAL TARGET to identify a potential TACTICAL BASE.

Jan-16-07  notyetagm: (VAR) Position after 22 ♗xf4 ♖xf4 23 ♘d5!:

click for larger view

This is the 2-move combination that Hou Yifan missed that would have won the exchange and probably the game.

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(VAR) 23 Nd5! Black c6-pawn cannot keep out White c3-N, g2-B
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