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Up Topic The Rybka Lounge / Computer Chess / A human game under the enginescope
- By MrKris (**) Date 2019-04-15 09:23 Edited 2019-04-15 09:27
2018 World Womens Chess Championship
https://ugra2018.fide.com/2018/11/22/ju-wenjun-equalizes-the-score-in-the-final/
Wenjun needed this win to force the tie-break that she won for the Title.

Stockfish, last move to 1st at 30 seconds each (Arena, amdphIIx6).
Notes by saved variations (not shown) and infinite.

After 16.Qa4? white was worse because of its passive bishop on a2 and out of play queen.

Black overlooked the crushing 19...c4!, blocking the protection of both of white's knights at once, when if whites saves its knight its king is too weak after the rook sacrifice on g2, as in the note.

White still had a chance until 28.Kh1?? allowed black to sacrifice a rook on g3, with its other rook holding the king to the h-file and its bishop on the long diagonal enougth to win; Stockfish pointing out that it would have been a little better 2 moves sooner.

[Event "WWCC 2018"]
[Site "Khanty-Mansiysk, RUS"]
[Date "2018.11.22"]
[Round "37.1"]
[White "Lagno Kateryna (RUS)"]
[Black "Ju Wenjun (CHN)"]
[Result "0-1"]
[ECO "B31"]
[Opening "Sicilian"]
[Variation "Rossolimo, 3...g6 4.O-O Bg7 5.Re1 e5"]
[Termination "normal"]
[PlyCount "64"]
[WhiteType "human"]
[BlackType "human"]

1. e4 {+0.03/27 30} c5 {-0.55/26 30} 2. Nf3 {0.00/27 30} Nc6 {-0.46/28 30}
3. Bb5 {+0.11/27 30} g6 {-0.31/28 30} 4. O-O {+0.04/30 30} Bg7 {-0.36/27
30} 5. Re1 {0.00/32 30} e5 {-0.69/29 30} 6. a3 {-0.15/30 30} Nge7 {-0.31/28
30} 7. Nc3 {-0.22/28 30} O-O {-0.13/28 30} 8. Bc4 {-0.29/31 30} d6
{-0.20/28 30} 9. d3 {-0.20/28 30} h6 {-0.42/27 30} 10. Nd5 {-0.32/30 30}
Kh7 {-0.09/25 30} 11. c3 {-0.42/29 30} f5 {-0.46/24 30} 12. exf5 {-0.67/27
30} gxf5 {-0.38/31 30} 13. b4 {-0.39/28 30} Ng6 {0.00/27 30} 14. b5
{-0.73/28 30 ? =+} (14. Rb1 {=}) 14. .. Na5 {+0.37/29 30} 15. Ba2 {-0.78/24
30} Be6 {+0.16/26 30} 16. Qa4 {-0.87/31 30 ? /+} (16. Bd2 {=+}) 16. .. b6
{+0.67/25 30} 17. Bd2 {-0.84/28 30} Rg8 {+0.14/27 30} 18. Rad1 {-1.00/27
30} Qd7 {+0.35/26 30} 19. Nh4 {-3.18/29 30 ??} (19. Kh1) 19. .. Bh8
{+1.00/32 30 ; ?} (19. .. c4 {! -+ , for example:} 20. Nxg6 Bxd5 21. dxc4 Be6 22. Nh4 Bf6
23. Nf3 Qb7 24. Kh1 Rxg2 {!! , same if 24.Kf1} 25. Kxg2 Rg8+ 26. Kf1 Qxf3 27. Re3 Qg2+ 28.
Ke2 Kh8 29. h3 e4 30. Qc2 Nxc4 31. Rf1 f4 32. Qxe4 Qxf1+ 33. Kxf1 Nxd2+ 34.
Ke2 Nxe4) 20. Nxg6 {-1.30/31 30} Rxg6 {+0.92/31 30} 21. Qh4 {-1.07/31 30}
Rag8 {+1.20/29 30} 22. g3 {-2.23/32 30} Qf7 {+1.54/32 30} 23. c4 {-1.31/30
30} Bf6 {0.00/37 30 ; ? =} (23. .. f4 {/+}) 24. Nxf6+ {0.00/36 30} Rxf6
{0.00/36 30} 25. f4 {0.00/34 30} Rg4 {0.00/35 30} 26. Qh3 {0.00/31 30} Rfg6
{0.00/28 30} 27. Rf1 {-0.85/31 30 ? /+} (27. Qf1 Qe7 28. Re2 {=}) 27. ..
Qg7 {+0.34/29 30} 28. Kh1 {-10.11/33 30 ; ?? -+} (28. Qh5 Bc8 (28. .. Qf7
{=+}) 29. Rf2 {=}) 28. .. Bc8 {+7.38/28 30} (28. .. Rxg3 {-+ faster} 29. hxg3
Rxg3 30. Qh5 Qb7+ 31. Rf3 Rxf3 32. Kg2 Rxf4+ 33. Kh3 Rf3+ 34. Kg2 Rf4+ 35.
Kh3 Bf7 36. Qe2 Rg4 37. Rf1 Be6 38. Qf2 Qf7) 29. Qh5 {-M10/61 30 ; ?} (29.d4 cxd4 (29...exd4 30.Kg2 d3 {! -+} ) 30.c5 dxc5 31.Bd5 Bb7 {-+} ) Bb7+
{+M9/72 30} 30. Kg1 {-M9/66 30} Rxg3+ {+M8/68 30} 31. hxg3 {-M4/126 30}
Rxg3+ {+M3/126 30} 32. Kf2 Rg2+ 0-1


Stockfish's rook sacrifice theme 24...Rxg2!! in its unplayed improvement 19...c4!
r7/pq5k/1p1pbb1p/nP2pp2/Q1P5/P1P2N2/B2B1PrP/3RR2K w - - 0 25

The human rook sacrifice played in the game 30...Rxg3! Mate in 8
8/pb4qk/1p1p2rp/nPp1pp1Q/2P2P2/P2P2r1/B2B3P/3R1RK1 w - - 0 31
Up Topic The Rybka Lounge / Computer Chess / A human game under the enginescope

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