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Up Topic The Rybka Lounge / Computer Chess / Bishpo move lost, pawn move had drawing chances
- By MrKris (***) Date 2020-11-15 21:30
(from a Lc0 nets match here)

DIAGRAM 1: from Cfish's improvement 21...h5(!), after 25.Qd2 = Cfish 0.00
6k1/q2b2b1/3p1r2/3Pp1pp/P1N1Pnp1/8/1P1Q1PPP/R3R1K1 b - - 1 25


DIAGRAM 2: from the game 21...Bf8?? lost, after 25.Qd2 +- Cfish +3.16
5bk1/q2b4/3p1r1p/3Pp1p1/P1N1Pnp1/8/1P1Q1PPP/R3R1K1 b - - 1 25


Re DIAGRAM 1: Black's bishop needs to stay on the long diagonal, AND black needs advanced pawns counter-play on the kingside:
[FEN "r2q2k1/p2b2b1/1p1p1r1p/1N1Pp1p1/P1N1Pnp1/4B3/1P3PPP/R2QR1K1 b - - 1 21"]

21. .. h5 {! <<-- Cfish 1 minute +0.66 with 22.Qb3} 22. Nxa7 {?! -to
compare to the wining variation-} Rxa7 23. Bxb6 {= Cfish 0.00 10 minutes}
Qb8 24. Bxa7 Qxa7 25. Qd2 {@@ = Cfish 0.00 90 seconds, DIAGRAM 1 @@}
Qd4 {<<<< Key move.} 26. Qxd4 exd4 27. Nb6 Rf7 28. Nxd7 Rxd7 29. a5 d3 30.
Kf1 Bxb2 31. Rab1 Bd4 32. Red1 Rc7 33. g3 {?? -to compare with the wining
variation, 33.Rbc1 = 0.00 Cfish 1 minute-} Rc2 {black can use its advanced g & h pawns} 34. gxf4 Rxf2+ 35. Ke1 (35. Kg1 Rc2+ 36. Kh1 gxf4 {-+ Cfish
black+9.40}) 35. .. Rxh2 36. Rb8+ Kg7 37. Rxd3 Bf2+ 38. Kf1 g3 39. fxg5 h4
{-+ Cfish black+17.87}


Re DIAGRAM 2: The game actually continued: [Event "G/90''+1'' Sy.6"]
[Site "RTX 2060"]
[Date "+- for mover, 2020.11.15"]
[Round "61"]
[White "Lc0v0.26.3_J94-40"]
[Black "Lc0.24.1_SVt40-1541"]
[Result "1-0"]
[BlackElo "2400"]
[ECO "E92"]
[Opening "King's Indian"]
[Variation "Gligoric-Taimanov, Main Line"]
[WhiteElo "2400"]
[TimeControl "90+1"]
[Termination "normal"]
[FEN "r2q2k1/p2b2b1/1p1p1r1p/1N1Pp1p1/P1N1Pnp1/4B3/1P3PPP/R2QR1K1 b - - 1 21"]

21... Bf8 {?? -0.46/11 0 4.1s} 22. Nxa7 {+0.65/14 0 2.8s <<-- Cfish 1 minute +2.71} Rxa7 {-1.10/14 0 2.4s}
23. Bxb6 {+0.63/15 0 0.92s} Qb8 {-1.26/18 0 4.9s} 24. Bxa7 {+0.65/14 0
3.2s} Qxa7 {-1.28/19 0 0.46s} 25. Qd2 {+0.68/14 0 1.2s @@ +- Cfish +3.16
90 seconds DIAGRAM 2 @@} h5 {-1.37/15 0 1.8s}

(25. .. Qd4 {<<<< Key move succeeds if 21...h5! above, but fails here after 21...Bf8?? >>} 26.
Qxd4 {+- Chish +5.61, 1 minute} exd4 27. Nb6 Rf7 28. Nxd7 Rxd7 29. Red1
(29. a5 d3 30. Kf1 Bg7 31. Red1 Bxb2 32. Rab1 Bd4 33. g3 Nh3 34. Rxd3 {+-})
29. .. Bg7 30. Kf1 d3 31. a5 Bd4 32. g3 Rb7 33. Ra2 Nh3 34. Rxd3 Bxf2 35.
e5 {+-})

26. b4 {+0.76/15 0 4.7s} h4 {-1.27/15 0 4.3s} 27. Qe3 {+0.78/19 0
4.1s} Qc7 {-1.02/17 0 4.9s} 28. Rec1 {+0.83/12 0 2.7s} Qb7 {-0.97/18 0
0.91s} 29. Rc2 {+0.73/14 0 7.0s} g3 {-1.00/14 0 5.3s} 30. fxg3 {+0.75/15 0
0.53s} hxg3 {-0.99/16 0 0.96s} 31. b5 {+0.84/15 0 1.4s} Be8 {-1.01/16 0
3.0s} 32. Re1 {+0.91/12 0 4.6s} gxh2+ {-1.16/12 0 4.0s} 33. Kh1 {+1.13/10 0
2.9s} g4 {-1.12/17 0 4.7s} 34. b6 {+1.37/10 0 2.2s} Bh6 {-1.14/15 0 0.48s}
35. Qg3 {+1.93/10 0 2.9s} Qg7 {-1.85/11 0 4.5s} 36. Qb3 {+2.23/11 0 2.7s}
Nh5 {-2.28/12 0 4.6s} 37. b7 {+3.39/9 0 3.3s} Qf7 {-2.72/10 0 4.3s} 38.
b8=Q {+5.78/9 0 3.2s} Kh7 {-3.04/10 0 2.8s} 39. Qd3 {+8.55/7 0 3.4s} Rf3
{-3.59/7 0 2.9s} 40. gxf3 {+14.23/7 0 2.7s} Ng3+ {-4.21/8 0 1.5s} 41. Kxh2
{+10.74/7 0 3.5s} Qh5+ {-4.31/8 0 2.5s} 42. Kxg3 {+17.22/8 0 2.6s} Qh3+
{-8.00/8 0 4.6s} 43. Kf2 {+24.37/6 0 0.001s} Qh2+ {-8.73/8 0 1.2s} 44. Kf1
{+21.62/1 0 0.001s} Qh1+ {-11.88/8 0 2.4s} 45. Ke2 {+35.05/6 0 5.2s} Qg2+
{-17.99/7 0 4.1s} 46. Kd1 {+58.14/1 0 0s} Bxa4 {-10.85/6 0 2.6s, White wins
by adjudication} 1-0
Up Topic The Rybka Lounge / Computer Chess / Bishpo move lost, pawn move had drawing chances

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