Bishop Entombement

[MMarco]

Nice game by Lc0 (with net BT4-6147500) against 8 threads Komodo Dragon. With 16. c4 and 17. c5! White entombs the bishop on a7 which won't ever see the light of the day. Afterwards White is effectively a piece up in the center and on the king side and went on to win.

[pgn][Event "BOTVINNIK, Blitz 10.0min+6.0sec"]
[Site "BOTVINNIK"]
[Date "2024.08.08"]
[Round "2"]
[White "Lc0 v0.31.0"]
[Black "Dragon 2.5.1 by Komodo Chess, 64-bit"]
[Result "1-0"]
[ECO "C65"]
[Annotator "0.27;0.49"]
[PlyCount "177"]
[TimeControl "600+6"]

{AMD Ryzen 9 5900HX with Radeon Graphics 3294 MHz W=10.2 plies; 7kN/s B=31.5 plies; 9 309kN/s; 2 850 254 TBAs} 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 {Les 2 dernier coup de la bibliothèque} 4. c3 {[%eval 27,19] [%emt 0:00:37]} Nf6 {[%eval 49,29] [%emt 0:00:22]} 5. O-O {[%eval 27,21] [%emt 0:00:07] (d4)} O-O {[%eval 49,33] [%emt 0:01:20]} 6. d4 {[%eval 29,21] [%emt 0:00:00]} Bb6 {[%eval 57,32] [%emt 0:00:24]} 7. a4 {[%eval 29,20] [%emt 0:00:00] (Fg5)} a6 {[%eval 28,32] [%emt 0:00:15]} 8. Bxc6 {[%eval 28,25] [%emt 0:00:01]} dxc6 {[%eval 31,33] [%emt 0:00:19]} 9. Nxe5 {[%eval 30,17] [%emt 0:00:24]} Nxe4 {[%eval 22,36] [%emt 0:00:00]} 10. Re1 {[%eval 31,15] [%emt 0:01:27]} Nd6 {[%eval 28,37] [%emt 0:00:00]} 11. a5 {[%eval 31,13] [%emt 0:00:00]} Ba7 {[%eval 26,35] [%emt 0:00:15]} 12. Be3 {[%eval 32,12] [%emt 0:00:21] (Ff4)} Re8 {[%eval 0,31] [%emt 0:00:14]} 13. Nf3 {[%eval 34,12] [%emt 0:00:41] (Cd2)} f6 {[%eval -9,33] [%emt 0:00:28]} 14. Nbd2 {[%eval 32,12] [%emt 0:00:28] (Da4)} Be6 {[%eval -7,34] [%emt 0:00:24]} 15. Qc2 {[%eval 33,13] [%emt 0:00:13] (Da4)} Qd7 {[%eval -13,29] [%emt 0:00:41] (Cf5)} 16. c4 {[%eval 42,17] [%emt 0:00:13] (Cf1)} Re7 {[%eval -34,32] [%emt 0:01:11] (c5)} 17. c5 {[%eval 69,10] [%emt 0:00:16] (Da4)} Nb5 {[%eval -44,28] [%emt 0:00:14]} 18. b4 {[%eval 72,9] [%emt 0:00:13] (Cf1)} Rae8 {[%eval -100,30] [%emt 0:00:15]} 19. h3 {[%eval 74,9] [%emt 0:00:26] (Tac1)} Bf7 {[%eval -70,36] [%emt 0:00:41] (Dd5)} 20. Kh2 {[%eval 66,9] [%emt 0:00:25] (Tac1)} Qd5 {[%eval -86,32] [%emt 0:00:25]} 21. Rac1 {[%eval 60,10] [%emt 0:00:17]} Bb8 {[%eval -66,33] [%emt 0:01:19] (Fh5)} 22. Rg1 {[%eval 87,8] [%emt 0:00:20] (Dd1)} Rd7 {[%eval -66,31] [%emt 0:00:16] (Fa7)} 23. g4 {[%eval 82,10] [%emt 0:00:22] (Tge1)} g5 {[%eval -89,28] [%emt 0:00:11]} 24. Qb2 {[%eval 81,10] [%emt 0:00:15] (Tce1)} h6 {[%eval -85,29] [%emt 0:00:27] (Fg6)} 25. Rg3 {[%eval 77,10] [%emt 0:00:18] (h4)} Kg7 {[%eval -69,31] [%emt 0:01:05] (b6)} 26. h4 {[%eval 75,9] [%emt 0:00:10]} Rg8 {[%eval -43,28] [%emt 0:00:23] (Fa7)} 27. Ng1 {[%eval 105,9] [%emt 0:00:18] (Te1)} Rh8 {[%eval -49,26] [%emt 0:00:23] (b6)} 28. Re1 {[%eval 118,10] [%emt 0:00:12]} Bg6 {[%eval -38,29] [%emt 0:00:00] (Te8)} 29. Rh3 {[%eval 104,12] [%emt 0:00:20] (Cgf3)} Re8 {[%eval 0,29] [%emt 0:00:16]} 30. Ne2 {[%eval 100,13] [%emt 0:00:06] (Cgf3)} Kg8 {[%eval 0,26] [%emt 0:00:11] (b6)} 31. Nc3 {[%eval 217,11] [%emt 0:00:20] (Tg1)} Nxc3 {[%eval 27,26] [%emt 0:00:12]} 32. Qxc3 {[%eval 208,10] [%emt 0:00:10]} Rde7 {[%eval 40,29] [%emt 0:00:10] (Fa7)} 33. f3 {[%eval 238,9] [%emt 0:00:31]} Kf7 {[%eval 56,28] [%emt 0:00:00] (Fa7)} 34. hxg5 {[%eval 239,10] [%emt 0:00:23] (Rg1)} hxg5 {[%eval 65,27] [%emt 0:00:07]} 35. Kg3 {[%eval 242,10] [%emt 0:00:07] (Rg2)} Kg7 {[%eval 55,30] [%emt 0:00:12] (Te6)} 36. Nf1 {[%eval 246,10] [%emt 0:00:30] (Rf2)} Qa2 {[%eval 68,32] [%emt 0:00:09] (Fa7)} 37. Rh2 {[%eval 306,8] [%emt 0:00:12]} Qd5 {[%eval 69,36] [%emt 0:00:00] (Df7)} 38. Bd2 {[%eval 353,10] [%emt 0:00:16] (Rf2)} Rxe1 {[%eval 90,31] [%emt 0:00:05]} 39. Bxe1 {[%eval 344,9] [%emt 0:00:03]} Qe6 {[%eval 93,29] [%emt 0:00:05]} 40. Bd2 {[%eval 332,9] [%emt 0:00:27] (Ff2)} Kf7 {[%eval 127,28] [%emt 0:00:30] (Fa7)} 41. Ne3 {[%eval 341,9] [%emt 0:00:16]} Rd8 {[%eval 145,29] [%emt 0:00:00] (Fa7)} 42. Be1 {[%eval 388,8] [%emt 0:00:26]} Rd7 {[%eval 183,31] [%emt 0:00:06] (Rg7)} 43. Bf2 {[%eval 461,7] [%emt 0:00:13]} Kg8 {[%eval 219,31] [%emt 0:00:00] (Td8)} 44. Rh1 {[%eval 468,8] [%emt 0:00:22] (Th6)} Rd8 {[%eval 214,34] [%emt 0:00:19] (Th7)} 45. Re1 {[%eval 440,7] [%emt 0:00:14] (Da1)} Qd7 {[%eval 265,27] [%emt 0:00:05]} 46. Kg2 {[%eval 428,7] [%emt 0:00:13] (d5)} Kg7 {[%eval 156,28] [%emt 0:00:10]} 47. Qb3 {[%eval 402,6] [%emt 0:00:16] (Th1)} Kf8 {[%eval 209,33] [%emt 0:00:08] (Df7)} 48. Rh1 {[%eval 407,7] [%emt 0:00:12]} Kg7 {[%eval 203,34] [%emt 0:00:04]} 49. Qa4 {[%eval 403,7] [%emt 0:00:14] (Dc3)} Qe6 {[%eval 213,34] [%emt 0:00:16] (Th8)} 50. Re1 {[%eval 390,7] [%emt 0:00:12]} Qd7 {[%eval 219,34] [%emt 0:00:01]} 51. Qb3 {[%eval 385,7] [%emt 0:00:13] (Da2)} Kf8 {[%eval 208,32] [%emt 0:00:09]} 52. Qa2 {[%eval 384,7] [%emt 0:00:11] (Td1)} Re8 {[%eval 216,34] [%emt 0:00:09]} 53. Rh1 {[%eval 369,7] [%emt 0:00:08] (Dc4)} Kg7 {[%eval 220,36] [%emt 0:00:04]} 54. Qa1 {[%eval 363,7] [%emt 0:00:13] (Dc4)} Qe6 {[%eval 220,33] [%emt 0:00:07] (Th8)} 55. Qe1 {[%eval 357,7] [%emt 0:00:11] (Te1)} Qb3 {[%eval 203,32] [%emt 0:00:13] (Rf7)} 56. Nf5+ {[%eval 364,9] [%emt 0:00:06]} Kf7 {[%eval 233,29] [%emt 0:00:00]} 57. Qd2 {[%eval 371,10] [%emt 0:00:12]} Rf8 {[%eval 256,29] [%emt 0:00:00] (Fa7)} 58. Re1 {[%eval 552,10] [%emt 0:00:06] (Rg3)} Bxf5 {[%eval 260,33] [%emt 0:00:03]} 59. gxf5 {[%eval 542,11] [%emt 0:00:02]} Qd5 {[%eval 319,33] [%emt 0:00:08]} 60. Qd3 {[%eval 600,10] [%emt 0:00:04] (De3)} g4 {[%eval 274,33] [%emt 0:00:12] (Te8)} 61. Kg3 {[%eval 700,11] [%emt 0:00:10] (Th1)} Qxf3+ {[%eval 329,35] [%emt 0:00:04]} 62. Qxf3 {[%eval 651,10] [%emt 0:00:04]} gxf3 {[%eval 334,39] [%emt 0:00:00]} 63. Rh1 {[%eval 640,8] [%emt 0:00:11]} Rd8 {[%eval 352,43] [%emt 0:00:00] (Rg7)} 64. Rh7+ {[%eval 761,8] [%emt 0:00:19] (Rxf3)} Kg8 {[%eval 361,35] [%emt 0:00:04]} 65. Re7 {[%eval 754,9] [%emt 0:00:06] (Th6)} Kf8 {[%eval 502,38] [%emt 0:00:05]} 66. Rh7 {[%eval 751,9] [%emt 0:00:07] (Te4)} Kg8 {[%eval 546,35] [%emt 0:00:03]} 67. Re7 {[%eval 779,9] [%emt 0:00:08] (Th6)} Kf8 {[%eval 511,35] [%emt 0:00:04]} 68. Re1 {[%eval 744,9] [%emt 0:00:07] (Te4)} Kg7 {[%eval 528,37] [%emt 0:00:12] (Rf7)} 69. Kxf3 {[%eval 668,8] [%emt 0:00:04]} Kf7 {[%eval 580,35] [%emt 0:00:03]} 70. Rh1 {[%eval 568,8] [%emt 0:00:05]} Kg7 {[%eval 586,34] [%emt 0:00:00]} 71. Rg1+ {[%eval 546,8] [%emt 0:00:09]} Kf7 {[%eval 634,34] [%emt 0:00:00]} 72. Rg6 {[%eval 482,8] [%emt 0:00:07]} Rg8 {[%eval 539,34] [%emt 0:00:00]} 73. Rh6 {[%eval 456,10] [%emt 0:00:02]} Kg7 {[%eval 595,33] [%emt 0:00:10]} 74. Be3 {[%eval 430,11] [%emt 0:00:06] (Th4)} Rd8 {[%eval 664,35] [%emt 0:00:06] (Th8)} 75. Rg6+ {[%eval 727,10] [%emt 0:00:07] (Th4)} Kf7 {[%eval 726,27] [%emt 0:00:04]} 76. Kg4 {[%eval 862,10] [%emt 0:00:01]} Rd5 {[%eval 750,27] [%emt 0:00:04] (Td7)} 77. Bf2 {[%eval 1115,10] [%emt 0:00:07]} Rd7 {[%eval 826,28] [%emt 0:00:00] (Fa7)} 78. Kf4 {[%eval 1429,10] [%emt 0:00:07]} b5 {[%eval 904,29] [%emt 0:00:19] (Fa7)} 79. Ke4 {[%eval 1769,8] [%emt 0:00:13]} Re7+ {[%eval 979,28] [%emt 0:00:00]} 80. Kd3 {[%eval 2006,8] [%emt 0:00:03]} Re8 {[%eval 1042,28] [%emt 0:00:05]} 81. Bh4 {[%eval 2194,8] [%emt 0:00:03]} Rh8 {[%eval 1061,29] [%emt 0:00:03]} 82. Bxf6 {[%eval 2647,8] [%emt 0:00:14] (Txf6+)} Rh1 {[%eval 1077,31] [%emt 0:00:06] (Th3+)} 83. Be5 {[%eval 2963,7] [%emt 0:00:04]} Rh3+ {[%eval 1101,28] [%emt 0:00:13] (Tf1)} 84. Ke4 {[%eval 2564,7] [%emt 0:00:07]} Rh4+ {[%eval 1196,26] [%emt 0:00:00]} 85. Kf3 {[%eval 2553,7] [%emt 0:00:08]} Rh1 {[%eval 1253,27] [%emt 0:00:02]} 86. Rxc6 {[%eval 4254,6] [%emt 0:00:05]} Re1 {[%eval 1253,29] [%emt 0:00:09] (Tf1+)} 87. Rxa6 {[%eval 4812,5] [%emt 0:00:07]} Rf1+ {[%eval 1491,27] [%emt 0:00:06]} 88. Ke4 {[%eval 3812,6] [%emt 0:00:05]} Rg1 {[%eval 1707,26] [%emt 0:00:10] (Te1+)} 89. Ra8 {[%eval 4757,5] [%emt 0:00:07] (Rd5)} 1-0

[/pgn]
According to Lc0 (and Stockfish 16.1), better for black at move 16 would have been to sacrifice a pawn with 16... c5! to avoid the dreadful locking up of the a7 bishop. Can your engine find 16... c5! ?

[d]r3r1k1/bppq2pp/p1pnbp2/P7/2PP4/4BN2/1PQN1PPP/R3R1K1 b - - 0 16

[Viz]

Stockfish lost to leela from the same opening in the same way at some TCEC bonus event IIRC.
Well, good to know it sees need in c5 nowadays.