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Larry Christiansen vs Irina Krush
United States Championship (2010), St. Louis, MO USA, rd 6, May-19
Sicilian Defense: 2.b3 Variation (B20)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
May-19-10  Riverbeast: Maybe Christiansen's position was more resilient than it first appeared

After 27 Qe3 it looked like he was barely holding on...Still, it's hard to say definitively how black should press her advantage

Ideas?

May-19-10  AgentRgent: Irina probably should have kicked the knight from g4 earlier... around move 19, before Larry got his rooks activated on the 2nd and 3rd ranks.

From move 19 through 28 it just doesn't look like she knew what to do and 28...h5 just works out really bad. It's a shame.

May-20-10  Roger Krueger: A rather odd sense of humor to play 2. b3 against someone nearly 30 years younger.
May-20-10  beenthere240: During the game I was looking at 27...h5, when the sac on e5 doesn't work. The knight has to retreat to h2, after which 28...h4 or even e5 might work. I imagine Krush was trying to calculate this, but then temporized with a horrible move 27. Re7 which unguards the F8 squqre twice -- by removing the Rook guard and simultaneously blocking the DSB. This, followed by 28. h5 which now does NOT work finally gave white a target. Up till then, it looked like white's rooks were completely uncordinated and blacks bishops were dominating.
May-20-10  Eyal: <During the game I was looking at 27...h5, when the sac on e5 doesn't work. The knight has to retreat to h2, after which 28...h4 or even e5 might work. I imagine Krush was trying to calculate this, but then temporized with a horrible move 27. Re7>

After 27...h5 the knight actually doesn't have to retreat, White has another sac - <28.Nxf6> - which is quite unpleasant for Black and should at least allow White to force a draw; e.g. 28...Rxf6 (28...gxf6 29.Rg6 and f6 falls with an ongoing attack - 29...Qe7? 30.Rh6+ Kg8 [30...Kg7 31.f5! exf5 32.Qg5+!] 31.Qg3+ Qg7 32.Rg6) 29.Bxf6 gxf6 30.Rg6 Qf7 31.f5 Be5 and now White probably has nothing better than forcing a perpetual with the rook on h6 & g6. Perhaps Krush was contemplating something along those lines, rather than just temporizing, when she played 27...Re7?

May-20-10  beenthere240: <Eyal>You may be right. Something clearly froze her during the game. Christiansen was in a bit of time trouble and she may have wanted to move something just to put him on the spot again. Unfortunately she put her rook on a real bad square.
May-26-10  AnalyzeThis: In other words, Christiansen outplayed her and won the game.
May-27-10  desiobu: <Eyal> I played out your idea, and found an interesting result if black tries to avoid the perpetual:

32. Rh6+ Kg7 33. Rg6+ Kf8 34. Qxc5+ Qe7 35. Qxe5! fxe5 and black returns the queen to avoid mate.

May-27-10  desiobu: Actually never mind, I guess 34. Re7 puts the question to white.
Dec-11-11  Derived: Nice to see this setup by White work out. One doesn't usually see this kind of structure.

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