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The game Stein - Petrosian switches from an equal position to winning for white in an even more subtle way.
18. Qe7 which is a perfectly fine looking move even to a chess engine, leads to the sacrifice of the a pawn to get the dark square bishop on a3 - a very cool manoevre.
At this stage the engine shows that 21. Qd8 should be played in preference to Qd7 and the position would still be equal. There is no difference in my eyes to 21. Qd7 and 21. Qd8, but the engine has them separated by 0.78 with 21. Qc7 coming in as 3rd choice at 1.79. Further down the line when white doubles rooks on the f file we can see why the queen should be back on the 8th rank leaving the 7th rank clear for the rook to defend f7.
The really decisive blunder comes in at move 24. with Rh6. The other rook leaves the protection of the f8 square and Bxe6 is already possible uncovering the attack on f7 and an x-ray attack on f8.
25. Bxe6 fxe6 26. Rf8+ Nxf8 27. Rxf8+ Kd7 28. Qg4 b4 29. Qxg7+ Kc6 30. Qxh6 Qd7 31. Bxb4 Bxc2
In the line played 25. Bc1 if black played the better defence Rh8 then white should've responded 26. Bh5 Nxe5 27. dxe5 g6 28. Bg4
Both games have innocent looking moves which are attributed by video authors WGM Tatev Abrahamyan and GM Roman Dzindzichashvili as being the decisive mistake of the game.
In the game Nakamura - Shulman 23. Rh2 looks fine in my patzer eyes. Shulman, however finds the accurate continuation 23...Qd3 24. Qf6 Rxg5.
Woah! that looks like a desparado sacrifice of the exchange.
But after 25.Qxg5 Qd4+ 26.Kh1 Qe3 with threats on the back rank white resigned.
Possible continuations I saw were;
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by jadedog 7 months ago
by jadedog 8 months ago
Queen & Knight Mating Puzzles
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