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Pavel Mikhailovich Kotsur vs Andrei Volokitin
Aeroflot Open (2011), Moscow RUS, rd 2, Feb-09
Scotch Game: Mieses Variation (C45)  ·  0-1
ANALYSIS [x]

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Kibitzer's Corner
Feb-09-11  Chesscomedian: Wow.
18...f6! 22...Bg7!! 23...Na4!
Analysis please.
Feb-09-11
Premium Chessgames Member
  Sastre: 23.Qxg7 Rxe6 24.Ba5 (to prevent 24...Na4+ 25.bxa4 Rb6+) would have been equal.

White was lost after 23...Na4+. If 24.bxa4, then 24...Rb6+ 25.Ka3 Bc6 and White can only delay mate.

Feb-09-11  riverunner: 22... Bg7
I think he just wanted to pull the knight away from attacking the c5 pawn.

But I could be wrong.

23... Na4
If white follows with PxN, Black checks with rook and coordinates with the queen for mate.

Feb-09-11
Premium Chessgames Member
  beenthere240: I think 22 Bg7 is a diversion. If 22. Na4+ etc. immediately, the white knight is still on e6, then Nxc7 is possible, which protects the h6 square and prevents an immediate rook check and if Kxc7 Qxc5 and the mating net is torn. This analysis is done on the fly and almost as full of holes as the final mating net wasn't.
Feb-10-11
Premium Chessgames Member
  Rob Morrison: 22. . . Bg7!! is indeed a brilliant diversion. The problem with 22. . . Na4+ immediately is that on 23. bxa4 Rb6+ 24. Ka3 black would like to play 24. . . Bc6, threatening 25. . . Qxa4 mate. But white would then have 25. Qxc7+ Ka8 26. Qc8+ and mate next.

So 22. . . Bg7!! draws the white knight away from being able to attack c7.

Sastre says that 23. Qxg7 Rxe6 24. Ba5 is equal. Actually, black then has 24. . . Be4!!, winning. White can then try:

A) 25. Qg8+ Kb7 26. Qxe6 Qb1+ with mate next.

B) 25. Bxb6 Rxb6 and there is no answer to the threat of 26. . . Qb1+.

C) 25. Bd3!! (best try) Qxh1 (25. . . Qxd3? 26. Qg8+ and 27. Qxe6) 26. Qg8+ Kb7 27. Qxe6 Bxd3 28. Bxb6 Qxg2+ wins.

Feb-10-11
Premium Chessgames Member
  Sastre: <Rob Morrison> After 23.Qxg7 Rxe6 24.Ba5, you're right in that 24...Be4 gives Black an advantage. Yet I think White is still alive after 25.Qc3 Qb1+ 26.Ka3 Rd6 27.Qb2 Qxb2+ 28.Kxb2 Rd1 29.h4 Bd3 30.f5 gxf5 31.Bxd3 Rxh1 32.Bxf1 .
Feb-10-11
Premium Chessgames Member
  Rob Morrison: Still alive? This will surely get to a position where white will be hopelessly tied up. On 25. Qc3 Qb1+ 26. Ka3 Rd6 27. Qb2 Rd1 (let's keep white's king stuck on a3) 28. Qxb1 Rxb1 29. h4. White can now hardly move and there is no need to force things with 29. . . Bd3.

Better would be 29. . . h5! Black can now look at repositioning the knight or moving the king up the board. White must be dead, though it could take a while.

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