The power of a bishop facing three connected passed pawns.

[Ajedrecista]

Hello:

The game Paehtz 0—1 Zhu from the second round of the Nicosia FIDE Women's Grand Prix 2024/25 has left a very interesting endgame. The game was drawn until Paehtz blundered with 49.- g5??:

[d]8/8/4kp1p/8/5KPP/4PP2/8/3b4 w - - 1 49

(Video when Zhu played 49.- ..., Bd1 and onwards here).

Zhu found the winning line 49.- ..., fxg5; 50.- hxg5, h5 and eventually won the game:

https://lichess.org/broadcast/fide-wome ... G/wBFtj5Gg

[pgn][Event "2025 Cyprus FIDE Women's Grand Prix"]
[Site "Nicosia, Cyprus"]
[Date "2025.03.16"]
[Round "2.2"]
[White "Paehtz, Elisabeth"]
[Black "Zhu, Jiner"]
[Result "0-1"]
[WhiteElo "2424"]
[WhiteTitle "GM"]
[WhiteFideId "4641833"]
[BlackElo "2514"]
[BlackTitle "GM"]
[BlackFideId "8608059"]
[TimeControl "90 min / 40 moves + 30 min/end + 30 second increment per move starting from move 1."]
[Variant "Standard"]
[ECO "D38"]
[Opening "Queen's Gambit Declined: Ragozin Defense"]
[Annotator "https://lichess.org/broadcast/-/-/cAdpEfUG"]
[StudyName "Round 2"]
[ChapterName "Paehtz, Elisabeth - Zhu, Jiner"]

1. d4 { [%eval 0.17] [%clk 1:30:57] } 1... Nf6 { [%eval 0.19] [%clk 1:30:52] } 2. c4 { [%eval 0.18] [%clk 1:31:24] } 2... e6 { [%eval 0.14] [%clk 1:31:17] } 3. Nf3 { [%eval 0.12] [%clk 1:31:49] } 3... d5 { [%eval 0.17] [%clk 1:31:43] } 4. Nc3 { [%eval 0.1] [%clk 1:32:14] } 4... Bb4 { [%eval 0.16] [%clk 1:31:52] } 5. Qb3 { [%eval 0.11] [%clk 1:32:34] } 5... a5 { [%eval 0.12] [%clk 1:31:56] } 6. cxd5 { [%eval 0.05] [%clk 1:31:59] } 6... exd5 { [%eval 0.11] [%clk 1:30:08] } 7. Bg5 { [%eval 0.14] [%clk 1:32:20] } 7... c6 { [%eval 0.38] [%clk 1:15:20] } 8. e3 { [%eval 0.19] [%clk 1:32:15] } 8... h6 { [%eval 0.18] [%clk 1:13:42] } 9. Bh4 { [%eval 0.28] [%clk 1:31:30] } 9... Nbd7 { [%eval 0.43] [%clk 1:10:10] } 10. Bd3 { [%eval 0.43] [%clk 1:30:19] } 10... c5 { [%eval 0.36] [%clk 1:05:45] } 11. Bxf6 { [%eval 0.3] [%clk 1:14:55] } 11... Nxf6 { [%eval 0.33] [%clk 1:05:51] } 12. dxc5 { [%eval 0.35] [%clk 0:58:05] } 12... O-O { [%eval 0.34] [%clk 1:04:58] } 13. O-O { [%eval 0.37] [%clk 0:58:14] } 13... Bxc5 { [%eval 0.4] [%clk 1:02:42] } 14. Rfd1 { [%eval 0.47] [%clk 0:57:22] } 14... Bg4 { [%eval 0.47] [%clk 0:55:33] } 15. Be2 { [%eval 0.46] [%clk 0:57:40] } 15... Be6 { [%eval 0.72] [%clk 0:55:55] } 16. Qxb7 { [%eval 0.71] [%clk 0:45:36] } 16... Rb8 { [%eval 0.8] [%clk 0:55:54] } 17. Qa6 { [%eval 0.71] [%clk 0:45:58] } 17... Qe7 { [%eval 0.74] [%clk 0:35:58] } 18. Nd4?! { [%eval 0.17] } { Inaccuracy. b3 was best. } { [%clk 0:39:09] } (18. b3 Bb4 19. Rac1 Bxc3 20. Rxc3 Qa3 21. Nd4 Ra8 22. Qb6 Qxa2 23. Rcc1 Qa3) 18... Bxd4 { [%eval 0.13] [%clk 0:33:51] } 19. Rxd4 { [%eval 0.12] [%clk 0:39:31] } 19... Rxb2 { [%eval 0.1] [%clk 0:34:03] } 20. Bf3 { [%eval 0.0] [%clk 0:27:57] } 20... Qa3 { [%eval 0.0] [%clk 0:24:05] } 21. Qd3 { [%eval -0.09] [%clk 0:22:10] } 21... Rc8 { [%eval -0.05] [%clk 0:21:09] } 22. Nxd5 { [%eval -0.04] [%clk 0:16:13] } 22... Qxd3 { [%eval -0.08] [%clk 0:21:33] } 23. Nxf6+ { [%eval -0.06] [%clk 0:10:47] } 23... gxf6 { [%eval -0.03] [%clk 0:21:57] } 24. Rxd3 { [%eval -0.04] [%clk 0:11:15] } 24... Rxa2 { [%eval -0.02] [%clk 0:22:15] } 25. Rxa2 { [%eval -0.02] [%clk 0:09:32] } 25... Bxa2 { [%eval -0.02] [%clk 0:22:39] } 26. h4 { [%eval 0.0] [%clk 0:09:47] } 26... a4 { [%eval 0.0] [%clk 0:22:09] } 27. Bd1 { [%eval -0.14] [%clk 0:08:26] } 27... Bb1 { [%eval 0.0] [%clk 0:22:23] } 28. Rd2?! { [%eval -0.65] } { Inaccuracy. Rd6 was best. } { [%clk 0:08:02] } (28. Rd6 Ra8 29. Rxf6 Kg7 30. Rf4 a3 31. Bb3 Ra7 32. f3 Kg6 33. Rg4+ Kf6) 28... a3 { [%eval -0.71] [%clk 0:11:34] } 29. Bb3 { [%eval -0.82] [%clk 0:08:26] } 29... Rc3?! { [%eval -0.19] } { Inaccuracy. Rb8 was best. } { [%clk 0:09:43] } (29... Rb8 30. Bc4 Bf5 31. Ra2 Rb1+ 32. Kh2 Rb4 33. Bxf7+ Kxf7 34. Rxa3 Rxh4+ 35. Kg3) 30. Ba2 { [%eval -0.21] [%clk 0:07:33] } 30... Rd3 { [%eval -0.26] [%clk 0:09:42] } 31. Re2 { [%eval -0.26] [%clk 0:04:22] } 31... Rd1+ { [%eval -0.32] [%clk 0:09:03] } 32. Kh2 { [%eval -0.28] [%clk 0:04:50] } 32... Bd3 { [%eval -0.1] [%clk 0:09:29] } 33. Bxf7+ { [%eval -0.16] [%clk 0:05:16] } 33... Kxf7 { [%eval -0.01] [%clk 0:09:55] } 34. Ra2 { [%eval -0.3] [%clk 0:05:43] } 34... Be4 { [%eval -0.07] [%clk 0:07:54] } 35. Rxa3 { [%eval 0.0] [%clk 0:06:08] } 35... Kg6 { [%eval 0.0] [%clk 0:08:15] } 36. Ra4 { [%eval 0.0] [%clk 0:06:15] } 36... Bd5 { [%eval 0.01] [%clk 0:07:51] } 37. Rg4+ { [%eval -0.31] [%clk 0:06:22] } 37... Kf5 { [%eval 0.0] [%clk 0:08:05] } 38. Rf4+ { [%eval 0.0] [%clk 0:06:38] } 38... Ke5 { [%eval 0.0] [%clk 0:08:27] } 39. Rg4 { [%eval -0.09] [%clk 0:06:16] } 39... Rd2 { [%eval -0.09] [%clk 0:06:15] } 40. Kg3 { [%eval -0.11] [%clk 0:06:35] } 40... Rc2 { [%eval -0.16] [%clk 0:06:32] } 41. Rg7 { [%eval 0.0] [%clk 0:26:34] } 41... Rc8 { [%eval 0.0] [%clk 0:30:20] } 42. Re7+ { [%eval 0.0] [%clk 0:26:59] } 42... Kd6 { [%eval 0.0] [%clk 0:30:46] } 43. Rg7 { [%eval 0.0] [%clk 0:27:26] } 43... Ke6 { [%eval 0.0] [%clk 0:19:03] } 44. f3 { [%eval 0.0] [%clk 0:27:11] } 44... Rc2 { [%eval 0.0] [%clk 0:18:59] } 45. Kf4 { [%eval 0.0] [%clk 0:21:59] } 45... Bc4 { [%eval 0.0] [%clk 0:15:37] } 46. Rc7 { [%eval 0.0] [%clk 0:18:14] } 46... Bd3 { [%eval 0.0] [%clk 0:15:35] } 47. Rxc2 { [%eval 0.0] [%clk 0:13:59] } 47... Bxc2 { [%eval 0.0] [%clk 0:16:00] } 48. g4 { [%eval 0.0] [%clk 0:13:57] } 48... Bd1 { [%eval -0.07] [%clk 0:15:39] } 49. g5?? { [%eval -6.77] } { Blunder. e4 was best. } { [%clk 0:13:07] } (49. e4) 49... fxg5+ { [%eval -6.25] [%clk 0:12:38] } 50. hxg5 { [%eval -6.23] [%clk 0:13:34] } 50... h5 { [%eval -5.76] [%clk 0:13:04] } 51. Kg3?! { [%eval -8.7] } { Inaccuracy. Ke4 was best. } { [%clk 0:13:07] } (51. Ke4 Kf7 52. Kf5 Kg7 53. e4 Bxf3 54. g6 Kh6 55. e5 Bd5 56. e6 Bxe6+) 51... Kf5 { [%eval -8.7] [%clk 0:13:20] } 52. f4 { [%eval -8.7] [%clk 0:13:32] } 52... Bb3 { [%eval -8.68] [%clk 0:13:12] } 53. Kf3 { [%eval -8.07] [%clk 0:10:26] } 53... Bd5+ { [%eval -60.89] [%clk 0:13:33] } 54. Kg3 { [%eval -37.87] [%clk 0:10:52] } 54... Bc6 { [%eval -70.65] [%clk 0:13:30] } 55. Kh3 { [%eval -73.56] [%clk 0:10:29] } 55... Be8 { [%eval -17.05] [%clk 0:13:25] } 56. Kg3 { [%eval #-25] [%clk 0:10:02] } 56... Ke4 { [%eval -66.22] [%clk 0:12:48] } 57. Kf2?! { [%eval #-24] } { Checkmate is now unavoidable. g6 was best. } { [%clk 0:08:51] } (57. g6 Bxg6) 57... Bg6 { [%eval #-24] [%clk 0:13:09] } 58. Ke2 { [%eval -8.54] [%clk 0:09:15] } 58... Bf5 { [%eval #-21] [%clk 0:13:18] } 59. Kf2 { [%eval #-22] [%clk 0:09:27] } 59... h4 { [%eval #-21] [%clk 0:06:03] } 60. Ke2 { [%eval #-23] [%clk 0:09:43] } 60... Bg4+?! { [%eval -25.57] } { Lost forced checkmate sequence. Bg6 was best. } { [%clk 0:05:58] } (60... Bg6 61. Kf2 Kf5 62. Kf3 Bh5+ 63. Kg2 Kg4 64. e4 Kxf4 65. e5 Kxg5 66. e6) 61. Kf2 { [%eval -8.03] [%clk 0:10:06] } 61... Bf5 { [%eval -7.99] [%clk 0:04:37] } 62. Ke2 { [%eval -7.79] [%clk 0:10:32] } 62... Bg4+ { [%eval -5.82] [%clk 0:03:55] } 63. Kf2 { [%eval -6.65] [%clk 0:10:58] } 63... Be6 { [%eval -8.87] [%clk 0:04:15] } 64. g6 { [%eval -8.32] [%clk 0:04:28] } 64... Kf5 { [%eval -7.49] [%clk 0:04:37] } 65. g7 { [%eval -7.11] [%clk 0:04:54] } 65... Kg6 { [%eval -6.9] [%clk 0:05:03] } 66. Kf3?! { [%eval -23.81] } { Inaccuracy. e4 was best. } { [%clk 0:05:03] } (66. e4 Kxg7 67. Ke3 Bg4 68. Kf2 Kh6 69. Ke3 Kh5 70. Kf2 Bd1 71. f5 Kg4) 66... Kxg7 { [%eval -18.4] [%clk 0:05:28] } 67. e4 { [%eval -13.64] [%clk 0:05:22] } 67... Bh3 { [%eval -12.77] [%clk 0:05:42] } 68. f5 { [%eval -8.4] [%clk 0:05:42] } 68... Kh7 { [%eval -80.53] [%clk 0:05:43] } 69. Kf4 { [%eval -63.92] [%clk 0:06:06] } 69... Kh6 { [%eval -45.04] [%clk 0:05:55] } 70. f6?! { [%eval #-23] } { Checkmate is now unavoidable. Ke3 was best. } { [%clk 0:05:26] } (70. Ke3) 70... Bd7 { [%eval -5.57] [%clk 0:04:53] } 71. e5?? { [%eval #-18] } { Checkmate is now unavoidable. Ke5 was best. } { [%clk 0:05:27] } (71. Ke5 Kg6 72. Kd6 Kxf6 73. Kxd7 Ke5 74. Ke7 Kxe4 75. Kf6 Kf4 76. Ke6 Kg5) 71... Be6 { [%eval #-17] [%clk 0:05:10] } 72. Kf3 { [%eval #-15] [%clk 0:05:41] } 72... Kg5 { [%eval #-14] [%clk 0:05:32] } 73. Kg2 { [%eval #-13] [%clk 0:06:08] } 73... Kg4 { [%clk 0:05:33] } 74. Kh2 { [%clk 0:06:33] } 74... h3 { [%clk 0:05:52] } 0-1[/pgn]

Huntsman sees a checkmate in 30 moves from 50.- h5.

Code: Select all

FEN: 8/8/4k2p/6P1/5K2/4PP2/8/3b4 b - - 0 50

Huntsman:
Found 145 tablebases
classical evaluation enabled
[...]
 35/6	00:00	     652.044	956.076	 0,00	h6xg5+ Kf4g3 Ke6f5 Kg3f2 Bd1xf3
 36/6	00:01	     844.470	805.791	 0,00	h6xg5+ Kf4g3 Ke6f5 Kg3f2 Bd1xf3
 37/20	00:01	   1.256.212	726.134	 0,00	h6xg5+ Kf4xg5
 38/3	00:02	   1.616.806	717.942	 0,00	h6xg5+ Kf4xg5
 39/34+	00:07	   6.274.314	869.379	+0,07	h6h5
 39/34+	00:07	   7.230.077	947.709	+0,15	h6h5
 39/50+	00:13	  18.741.113	1.418.599	+60,65	h6h5
 39/50	00:13	  18.788.757	1.419.412	+60,65	h6h5 Kf4e4 Bd1a4 Ke4f4 Ba4d7 e3e4 Ke6f7 Kf4g3 Kf7g6 f3f4 Bd7c6 Kg3f3 Bc6b5 Kf3e3 Bb5a4 Ke3f3 Ba4c6 Kf3e3 h5h4 Ke3f3 Bc6d7 Kf3e2 Kg6h5 Ke2e1 Bd7a4
 40/46+	00:14	  19.966.287	1.425.450	+152,00	h6h5
 40/46	00:18	  28.951.778	1.600.783	+152,44	h6h5 Kf4e4 Bd1b3 Ke4f4 Bb3a4 Kf4g3 Ke6f5 f3f4 Ba4c6 Kg3h4 Bc6e8 Kh4g3 Kf5e4 Kg3f2 Be8g6 Kf2e2 h5h4 Ke2f2 Ke4f5 Kf2f3 Bg6h5+ Kf3g2 Kf5g4 Kg2h2 Bh5g6 Kh2g2 Bg6c2 Kg2h1 Kg4g3 Kh1g1 h4h3 Kg1f1 Bc2g6 Kf1e1 h3h2 Ke1d1 h2h1Q+ Kd1d2 Qh1e4 Kd2e2 Qe4d3+ Ke2e1
 41/47	00:20	  35.206.040	1.744.514	+152,47	h6h5 Kf4e4 Bd1a4 Ke4f4 Ba4c6 e3e4 Ke6f7 Kf4e3 Kf7g6 f3f4 Bc6d7 Ke3f2 h5h4 Kf2g2 Bd7g4 Kg2f2 Bg4d1 Kf2e3 Kg6h5 Ke3f2 Kh5g4 Kf2e3 h4h3 Ke3f2 Bd1c2 g5g6 Kg4xf4 g6g7 Bc2b3 Kf2g1 Kf4g3 Kg1f1 h3h2 Kf1e2 Kg3f4 Ke2d3 h2h1Q Kd3d2 Qh1xe4 Kd2c3
 42/42	00:20	  35.675.114	1.753.507	+152,47	h6h5 Kf4e4 Bd1a4 Ke4f4 Ba4c6 Kf4g3 Ke6e5 f3f4+ Ke5f5 Kg3h4 Bc6e8 Kh4g3 Kf5e4 Kg3f2 Be8g6 Kf2e2 h5h4 Ke2f2 Ke4f5 Kf2f3 Bg6h5+ Kf3g2 Kf5g4 Kg2h2 Bh5g6 Kh2g2 Bg6f5 Kg2f2 h4h3 g5g6 Bf5xg6 Kf2e2 Kg4g3 Ke2d1 Kg3f3 Kd1d2 Bg6e4 Kd2c1 Kf3xe3 Kc1b2 Ke3xf4 Kb2c3
[...]
 56/59	00:36	  85.752.586	2.342.966	+152,47	h6h5 Kf4g3 Ke6f5 f3f4 Bd1b3 Kg3f3 Bb3d5+ Kf3g3 Bd5c6 Kg3h4 Bc6e8 Kh4g3 Kf5e4 Kg3f2 Be8g6 Kf2e2 h5h4 Ke2f2 Ke4f5 Kf2f3 Bg6h5+ Kf3g2 Kf5g4 Kg2h2 Bh5g6 Kh2g2 h4h3+ Kg2f2 Bg6f5 g5g6 Bf5xg6 Kf2e2 Kg4g3 Ke2d1 Kg3f3 Kd1d2 Bg6e4 Kd2c1 Kf3xe3 Kc1d1 Ke3xf4 Kd1d2 h3h2 Kd2c3
 57/60	00:38	  90.759.551	2.375.407	+152,47	h6h5 Kf4g3 Ke6f5 f3f4 Bd1b3 Kg3f3 Bb3d5+ Kf3g3 Bd5c6 Kg3h4 Bc6e8 Kh4g3 Kf5e4 Kg3f2 Be8g6 Kf2e2 h5h4 Ke2f2 Ke4f5 Kf2f3 Bg6h5+ Kf3g2 Kf5g4 Kg2h2 Bh5g6 Kh2g2 h4h3+ Kg2f2 Bg6e4 g5g6 Be4xg6 Kf2e2 Kg4g3 Ke2d1 Kg3f3 Kd1d2 Bg6e4 Kd2c1 Kf3xe3 Kc1b2 Ke3xf4 Kb2c3 h3h2 Kc3b4 h2h1Q Kb4c5 Qh1a1 Kc5b5 Qa1c3 Kb5b6 Kf4g5 Kb6b5 Be4f3 Kb5b6 Qc3c6+ Kb6a5
 58/68	01:11	 203.546.915	2.873.211	+152,52	h6h5 Kf4g3 Ke6f5 f3f4 Bd1b3 Kg3f3 Bb3d5+ Kf3g3 Bd5c6 Kg3h4 Bc6e8 Kh4g3 Kf5e4 Kg3f2 Be8g6 Kf2e2 h5h4 Ke2f2 Ke4f5 Kf2f3 Bg6h5+ Kf3g2 Kf5g4 f4f5 Kg4xf5 g5g6 Bh5xg6 Kg2f3 Kf5g5 e3e4
 59/66	06:42	1.744.756.697	4.335.908	+M31	h6h5 Kf4g3 Ke6f5 f3f4 Bd1b3 Kg3f3 Bb3d5+ Kf3g3 Bd5c6 g5g6 Kf5xg6 Kg3h4 Bc6d5 Kh4g3 Kg6f5 Kg3h3 Bd5f7 Kh3h4 Bf7e8 Kh4g3 Kf5e4 Kg3h4 Ke4xe3 Kh4g5 Ke3e4 f4f5 Ke4e5 f5f6 Be8f7 Kg5h4 Ke5xf6 Kh4g3 Kf6g5 Kg3f3 h5h4 Kf3e4 Bf7h5 Ke4e3 h4h3 Ke3f2 Kg5g4 Kf2e3 h3h2 Ke3d4 h2h1Q Kd4c5 Bh5g6 Kc5b5 Qh1d5+ Kb5b4 Kg4f4 Kb4a4 Qd5c5 Ka4b3 Bg6e4 Kb3b2 Qc5b4+ Kb2a2 Kf4f3 Ka2a1 Qb4b1+
 60/62	08:47	2.347.266.976	4.453.303	+M30	h6h5 e3e4 Bd1c2 g5g6 Ke6f6 g6g7 Bc2b3 Kf4g3 Kf6xg7 Kg3h4 Kg7g6 Kh4g3 Bb3d1 f3f4 Bd1a4 Kg3h4 Ba4c6 e4e5 Bc6e8 Kh4h3 Kg6f5 Kh3g3 Be8g6 Kg3f3 h5h4 e5e6 Bg6h5+ Kf3g2 Kf5xf4 Kg2h3 Kf4g5 Kh3h2 Kg5g4 Kh2g2 h4h3+ Kg2f2 Bh5g6 Kf2f1 Kg4f3 Kf1e1 h3h2 Ke1d2 h2h1Q Kd2c3 Qh1c1+ Kc3b4 Bg6e8 Kb4a5 Kf3f4 Ka5b6 Qc1c6+ Kb6a7 Kf4g5 Ka7b8 Be8g6 Kb8a7 Qc6c7+ Ka7a6 Bg6d3+
 61/64	10:12	2.755.970.560	4.503.248	+M30	h6h5 e3e4 Bd1c2 g5g6 Ke6f6 g6g7 Bc2b3 Kf4g3 Kf6xg7 Kg3h4 Kg7g6 Kh4g3 Bb3d1 f3f4 Bd1a4 Kg3h4 Ba4c6 e4e5 Bc6e8 Kh4h3 Kg6f5 Kh3g3 Be8g6 Kg3f3 h5h4 e5e6 Bg6h5+ Kf3g2 Kf5xf4 Kg2h3 Kf4g5 Kh3h2 Kg5g4 Kh2g2 h4h3+ Kg2f2 Bh5g6 Kf2f1 Kg4f3 Kf1e1 h3h2 Ke1d2 h2h1Q Kd2c3 Qh1c1+ Kc3b3 Qc1c5 e6e7 Kf3f4 e7e8Q Bg6xe8 Kb3b2 Qc5b4+ Kb2c1 Kf4e3 Kc1c2 Be8g6+ Kc2c1 Qb4b1+
 62/64	10:50	2.934.206.796	4.509.533	+M30	h6h5 e3e4 Bd1c2 g5g6 Ke6f6 g6g7 Bc2b3 Kf4g3 Kf6xg7 Kg3h4 Kg7g6 Kh4g3 Bb3d1 f3f4 Bd1a4 Kg3h4 Ba4c6 e4e5 Bc6e8 Kh4h3 Kg6f5 Kh3g3 Be8f7 Kg3h4 Kf5xf4 e5e6 Bf7e8 Kh4h3 Kf4g5 Kh3g3 h5h4+ Kg3h3 Be8c6 Kh3h2 Kg5g4 Kh2g1 h4h3 Kg1h2 Bc6e8 e6e7 Kg4h4 Kh2g1 Kh4g3 Kg1f1 h3h2 Kf1e2 Kg3f4 Ke2d1 h2h1Q+ Kd1c2 Kf4e3 Kc2c3 Qh1c1+ Kc3b4 Ke3d4 Kb4b3 Kd4c5 Kb3a2 Be8f7+
 63/60	12:01	3.253.007.967	4.509.499	+M30	h6h5 e3e4 Bd1c2 g5g6 Ke6f6 g6g7 Bc2b3 Kf4g3 Kf6xg7 Kg3h4 Kg7g6 Kh4g3 Bb3f7 f3f4 Bf7e8 Kg3h3 Be8c6 e4e5 Kg6f5 Kh3h4 Bc6e8 Kh4g3 Be8g6 e5e6 Kf5xe6 Kg3h4 Ke6f5 Kh4g3 Bg6f7 Kg3h3 Kf5xf4 Kh3h4 Kf4f5 Kh4g3 Kf5g5 Kg3f2 h5h4 Kf2f3 Bf7d5+ Kf3e3 h4h3 Ke3d4 Bd5f7 Kd4e4 h3h2 Ke4d4 h2h1Q Kd4c5 Qh1d5+ Kc5b6 Bf7g6 Kb6c7 Qd5c5+ Kc7b7 Bg6e4+ Kb7a6 Qc5b4 Ka6a7 Qb4b7+
 64/60	12:46	3.462.258.818	4.517.075	+M30	h6h5 e3e4 Bd1c2 g5g6 Ke6f6 g6g7 Bc2b3 Kf4g3 Kf6xg7 Kg3h4 Kg7g6 Kh4g3 Bb3f7 f3f4 Bf7e8 Kg3h3 Be8c6 e4e5 Kg6f5 Kh3h4 Bc6e8 Kh4g3 Be8g6 e5e6 Kf5xe6 Kg3h3 Ke6f5 Kh3g3 Bg6e8 Kg3h3 Kf5xf4 Kh3h4 Be8f7 Kh4h3 Kf4g5 Kh3g2 h5h4 Kg2h3 Bf7e6+ Kh3g2 Kg5g4 Kg2f1 h4h3 Kf1f2 Kg4f4 Kf2f1 Kf4f3 Kf1e1 h3h2 Ke1d2 h2h1Q Kd2c2 Kf3e3 Kc2c3 Qh1b7 Kc3c2 Be6a2 Kc2c1 Qb7b1+
 65/60	12:53	3.491.950.800	4.516.941	+M30	h6h5 e3e4 Bd1c2 g5g6 Ke6f6 g6g7 Bc2b3 Kf4g3 Kf6xg7 Kg3h4 Kg7g6 Kh4g3 Bb3f7 f3f4 Bf7e8 Kg3h3 Be8c6 e4e5 Kg6f5 Kh3h4 Bc6e8 Kh4g3 Be8g6 e5e6 Kf5xe6 Kg3f3 Ke6f5 Kf3g3 Bg6f7 Kg3h3 Kf5xf4 Kh3h4 Kf4f5 Kh4g3 Kf5g5 Kg3h3 h5h4 Kh3g2 Kg5g4 Kg2f1 h4h3 Kf1f2 Bf7e6 Kf2g1 Kg4f3 Kg1f1 h3h2 Kf1e1 h2h1Q+ Ke1d2 Qh1b1 Kd2c3 Qb1e1+ Kc3b2 Qe1d2+ Kb2b1 Be6b3 Kb1a1 Qd2c1+
 66/60	13:59	3.789.328.488	4.515.866	+M30	h6h5 e3e4 Bd1c2 g5g6 Ke6f6 g6g7 Bc2b3 Kf4g3 Kf6xg7 Kg3h4 Kg7g6 Kh4g3 Bb3f7 f3f4 Bf7e8 Kg3h3 Be8c6 e4e5 Kg6f5 Kh3h4 Bc6e8 Kh4g3 Be8g6 e5e6 Kf5xe6 Kg3f3 Ke6f5 Kf3g3 Bg6f7 Kg3h3 Kf5xf4 Kh3h4 Kf4f5 Kh4g3 Kf5g5 Kg3h3 h5h4 Kh3g2 Kg5g4 Kg2f1 h4h3 Kf1f2 Bf7e6 Kf2e3 h3h2 Ke3d4 h2h1Q Kd4c5 Qh1c1+ Kc5b5 Qc1c4+ Kb5b6 Be6d5 Kb6a5 Qc4c5+ Ka5a6 Qc5b4 Ka6a7 Qb4b7+
 67/60	14:36	3.941.109.549	4.500.103	+M30	h6h5 e3e4 Bd1c2 g5g6 Ke6f6 g6g7 Bc2b3 Kf4g3 Kf6xg7 Kg3h4 Kg7g6 Kh4g3 Bb3f7 f3f4 Bf7e8 Kg3h3 Be8c6 e4e5 Kg6f5 Kh3h4 Bc6e8 Kh4g3 Be8g6 Kg3h4 Kf5xf4 e5e6 Kf4f5 e6e7 Bg6e8 Kh4h3 Kf5g5 Kh3g3 h5h4+ Kg3f3 Be8c6+ Kf3e2 h4h3 e7e8Q Bc6xe8 Ke2f1 Kg5f4 Kf1f2 Be8g6 Kf2f1 Kf4e3 Kf1g1 Bg6f5 Kg1h2 Ke3f3 Kh2g1 Bf5g4 Kg1h2 Kf3f2 Kh2h1 Kf2g3 Kh1g1 h3h2+ Kg1f1 h2h1Q+
 68/60	17:21	4.654.212.002	4.471.160	+M30	h6h5 e3e4 Bd1c2 g5g6 Ke6f6 g6g7 Bc2b3 Kf4g3 Kf6xg7 Kg3h4 Kg7g6 Kh4g3 Bb3f7 f3f4 Bf7e8 Kg3h3 Be8c6 e4e5 Kg6f5 Kh3h4 Bc6e8 Kh4g3 Be8g6 Kg3h4 Kf5xf4 e5e6 Bg6e8 Kh4h3 Kf4g5 Kh3g3 h5h4+ Kg3h3 Be8g6 Kh3g2 Kg5g4 Kg2f1 h4h3 Kf1f2 Kg4f4 e6e7 Bg6e8 Kf2f1 Kf4g3 Kf1e2 h3h2 Ke2d3 h2h1Q Kd3d4 Kg3f4 Kd4c3 Qh1c1+ Kc3b4 Qc1b2+ Kb4c5 Kf4f5 Kc5c4 Kf5e4 Kc4c5 Qb2d4+
 69/60	17:27	4.680.337.977	4.470.288	+M30	h6h5 e3e4 Bd1c2 g5g6 Ke6f6 g6g7 Bc2b3 Kf4g3 Kf6xg7 Kg3h4 Kg7g6 Kh4g3 Bb3f7 f3f4 Bf7e8 Kg3h3 Be8c6 e4e5 Kg6f5 Kh3h4 Bc6e8 Kh4g3 Be8g6 e5e6 Kf5xe6 Kg3f3 Ke6f5 Kf3g3 Kf5e4 f4f5 Ke4xf5 Kg3h4 Bg6f7 Kh4g3 Kf5g5 Kg3f2 h5h4 Kf2g2 Kg5g4 Kg2f1 h4h3 Kf1f2 Bf7e6 Kf2e3 h3h2 Ke3d4 h2h1Q Kd4c5 Qh1c1+ Kc5b5 Qc1c4+ Kb5b6 Be6d5 Kb6a5 Qc4c5+ Ka5a6 Qc5b4 Ka6a7 Qb4b7+
 70/60	18:12	4.879.119.269	4.467.673	+M30	h6h5 e3e4 Bd1c2 g5g6 Ke6f6 g6g7 Bc2b3 Kf4g3 Kf6xg7 Kg3h4 Kg7g6 Kh4g3 Bb3f7 f3f4 Bf7e8 Kg3h3 Be8c6 e4e5 Kg6f5 Kh3h4 Bc6e8 Kh4g3 Be8g6 e5e6 Kf5xe6 Kg3f3 Ke6f5 Kf3g3 Kf5e4 f4f5 Ke4xf5 Kg3h4 Bg6f7 Kh4g3 Kf5g5 Kg3f2 h5h4 Kf2e3 Kg5g4 Ke3e2 h4h3 Ke2f2 Bf7e6 Kf2e3 h3h2 Ke3d4 h2h1Q Kd4c5 Qh1c1+ Kc5b5 Qc1c4+ Kb5b6 Be6d5 Kb6a5 Qc4c5+ Ka5a6 Qc5b4 Ka6a7 Qb4b7+

There were 272,414,967 TB hits to the full set of 3, 4 and 5-man Syzygy EGTB.

I liked this endgame a lot, with tons of subtleties (like this one with an hypothetical 68.- ..., Kf6?? blundering the win; or this one with an hypothetical 72.- f7, Bxf7??; 73.- Kg4) and drawing chances always there. The commentator GM Alik Gershon even said at some point that the position was like a Réti's study, with the king attacking both sides. I specially liked the variation given here, with exclamation marks noting only winning moves:

[pgn][Event ""]
[Site ""]
[Date ""]
[White ""]
[Black ""]
[SetUp "1"]
[FEN "8/8/2b5/5kP1/5P1p/4P3/5K2/8 w - - 0 56"]
[Result "0-1"]

56. Kg1 Kg4 57. g6 Kg3! 58. g7 Bd5! 59. e4 Bc4 60. f5 h3 61. f6 h2+ 62. Kh1 Bb3 (62. ... Bb3 63. g8=Q+ Bxg8! 64. f7 Bxf7 65. e5 Bd5#) 0-1[/pgn]

Regards from Spain.

Ajedrecista.

[jp]

...
I liked this endgame a lot, with tons of subtleties (like this one with an hypothetical 68.- ..., Kf6?? blundering the win; or this one with an hypothetical 72.- f7, Bxf7??; 73.- Kg4) and drawing chances always there. The commentator GM Alik Gershon even said at some point that the position was like a Réti's study, with the king attacking both sides. ...

Thanks for posting, Ajedrecista.

Did Gershon have a particular study in mind? (Sorry, for posting this without first clicking the link.)

I was looking for the time control (90 minutes for the first 40 moves, followed by 30 minutes for the rest of the game, with a 30-second increment per move starting from move one) and found Colin McGourty's report (at chess.com), which noted Paehtz played 49.g5?? "in under two minutes". It also notes that 64... Kf5 is an only move (64... Bf5?? 65.g7 Bh7 66. Kg2), as is 69... Kh6!.

[Ajedrecista]

Hello:

[...]

Did Gershon have a particular study in mind? (Sorry, for posting this without first clicking the link.)

[...]

I guess he had in mind the very famous Réti's study of 1921 (Wikipedia, CPW, YACPDB, PDB), which had many reprints. The original source from 1921 is in the left column of the page 13 of the issue of September 11th, 1921 of Deutschösterreichische Tages-Zeitung newspaper:

https://anno.onb.ac.at/cgi-content/anno ... 13&zoom=33

[...]
______
1. Endspiel.
Nach einer Partie Marco—Schlechter, Wien 1895.
Weiß (2 Steine): Kh8, Bc6.
Schwarz (2 Steine): Ka6, Bh5.
Weiß am Zuge hält das Spiel unentschieden.
Beim ersten Anblicke wird wohl jedermann das weiße Spiel für hoffnungslos erachten, da der weiße König dem feindlichen Freibauern nur vergeblich nachlaufen fann, während der Bc6 ausgehalten ist. In diesem Endspiele mit nur vier Steinen stecken aber doch seine Wendangen, wie der Lösungsverlans zeigt:
1. Kh8—g7 h5—h4 2. Kg7—f6.
A. 2. ...  h4—h3 3. Kf6—e7!  h3—h2    4.  c6—c7 Ka6—b7 5. Ke7—d7  h2—h1D 6.  c7—c8D† usw.
B. 2. ... Ka6 b6 3. Kf6—e5!  h4—h3[1] 4. Ke5—d6  h3—h2 5.  c6—c7  h2—h1D 6.  c7—c8D  usw.
[1] Nach 3 ... Kb6Xc6 4. Ke5—f4 hat der weiße König den stolzen Freibauern eingeholt!
______
[...]

Typos are expected. Please note that Bc6 is not 'bishop on c6' but 'bauer [pawn] at c6'. However, Réti's name does not appear at all.

------------

[...]

I was looking for the time control (90 minutes for the first 40 moves, followed by 30 minutes for the rest of the game, with a 30-second increment per move starting from move one) and found Colin McGourty's report (at chess.com), which noted Paehtz played 49.g5?? "in under two minutes". It also notes that 64... Kf5 is an only move (64... Bf5?? 65.g7 Bh7 66. Kg2), as is 69... Kh6!.

Yes, there were some 'only moves'. Black played this endgame really well after the not so evident blunder. I wonder how mid rated engines without EGTB would play after 49.- g5??

Regards from Spain.

Ajedrecista.

[jp]

...
Yes, there were some 'only moves'. Black played this endgame really well after the not so evident blunder. I wonder how mid rated engines without EGTB would play after 49.- g5??

I've changed my mind a couple of times about this. I currently think even weak engines would not have any problems. Sometimes being an only move can be misleading. It might be the most natural move or an easy move. (Re-captures are an example.)

e.g. 67... Bh3 is an only move but, with f5 threatened, Black has no other move that even looks like saving the pawn. The resulting position is quite pretty, though: The g2-g3-g4 squares are guarded, but the bishop is now in the way of its own pawn.

[chrjly2]

An average engine like Knightx finds fxg5 ! in one minute. Stockfish 8 finds it in 0.07s and after 2 minutes sees mate in 37. No EGTB.
It's not a issue for engines.

15 +0,65 145703 0:00.07 fxg5+ hxg5 h5 e4 Kf7 Kg3 Bc2 e5 Kg6 Kh4 Bb3 f4 Bf7 Kg3 Kf5 Kh4 Kxf4 e6 Bg6 e7
...
47 #37 567,0M 2:10.30 fxg5+ hxg5 h5 Ke4 Ba4 Kf4 Kf7 Kg3 Kg6 f4 Kf5 Kf3 Bc6+ Kg3 Bd5 Kh4 Bf7 Kh3 Bg6 Kg3 Ke4 Kh4 Be8 Kg3 Kxe3 f5 Ke4 g6 Kxf5 g7 Bf7 Kh4 Kg6 Kg3 Kxg7 Kf3 Kf6 Kf4 Be6 Kf3 Kg5 Kg3 h4+ Kf3 h3 Kg3 Bg4 Kf2 Kf4 Ke1 Kg3 Kd2 h2 Kc3 Be6 Kc2 h1=

[jp]

An average engine like Knightx finds fxg5 ! in one minute. Stockfish 8 finds it in 0.07s and after 2 minutes sees mate in 37. No EGTB.
It's not a issue for engines. ...

But playing fxg5 is not difficult for humans either, so that in itself is not an achievement. What score does Knightx assign to it? If it's +6, then that's an achievement. The humans who'll all play fxg5 followed by h5 may blunder away the win later down the line. The impressive thing about SF is finding mate at depth 47, i.e. it saw through to the end.

[chrjly2]

Knightx assigns a +12 score to fxg5, it's an achievement. Every program will see a positional advantage first, then a win with the promotion of the black pawn. It' s a matter of time. Not all programs will see the mate.