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Stanislav G Kriventsov vs Jennifer Shahade
United States Championship (2003), Seattle, WA USA, rd 7, Jan-16
Sicilian Defense: Najdorf Variation (B90)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Jun-06-05  Shams: Shahade finished calmly in this nice game but I think she had a quick mate with 30...Rxa1+! 31.Kxa1. Now:

31...Nxb2 32.Ka2 and I can find nothing for black, but

31...Bxb2+ 32.Kb1 (32.Ka2 Nc1+ 33.Kb1 Bxa3+ with mate in two or the skewer of the queen)

32...Bc3+ (not ...Bxa3+? 33.Ka2 Nc1+ 34.Kxa3 Qc5+ 35.Kxa4 [35.Kb2?? a3+ is nifty] and I believe the black king marches forward for a likely perpetual) 33.Kc2 (33.Ka2? Nc1#) Qb2+ winning the queen and the game.

the game would have been over much sooner if white tried to get his piece back with 21.gxf6, since 21...Bxf6 22.Qc1 Nc5 and black's threats of ...a3 and ...Na4 can not be countered.

May-29-07  Crowaholic: Thanks, Shams! Nice observation. One correction, though: 30. ..Rxa1+ 31. Kxa1 Bxb2+ 32. Ka2 Nc1+ 33. Kb1 Bxa3+ 34. Ka1 is not a mate in two. This is an important line because computers seem to prefer it (I played this out against Sigma Chess at max. strength and high search time). Black continues with

34. ..Bc5! 35. Qb2 (or Rh2, but Qb2 gives White more options) Bd4 36. Qxd4 (again, Rh2 is possible) Qxd4+ 37. Kb1 a3! 38. Rh2 (forced) Qxd1 39. f4 (waiting move, White doesn't have anything better) a2+!

and now:

If 40. Rxa2 then Nd3#
If 40. Ka1 then Qd4+ 41. Rb2 Nd3 42. (any) Qxb2#
If 40. Kb2 then Qb3+ 41. Kxc1 a1=Q+ 42. Kd2 Qad1#

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