In this position, the White Queen moves to h8 so White can bring his rook down to h7 with check. This will be difficult for some engines, and easy for others I would suspect. this position is based on the ERET 84 position after making a few moves..
[d]4rn2/1r2pk2/1p1R1pp1/p1q3B1/2b1P1PQ/2P2P2/P3B1KR/8 w - - 0 31
Test Position 31.Qh8!
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Re: Test Position 31.Qh8!
I'm not a big chess player, but what white cha achieve after Qh8! ? I let Stockfish and Vajolet search a lot but cannot din anython but draw
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Re: Test Position 31.Qh8!
Old Critter-1.6a takes a bit to favor Qh8 over Be3, but then sticks with the former:acase wrote: ↑Sun Apr 28, 2019 12:09 pm In this position, the White Queen moves to h8 so White can bring his rook down to h7 with check. This will be difficult for some engines, and easy for others I would suspect. this position is based on the ERET 84 position after making a few moves..
[d]4rn2/1r2pk2/1p1R1pp1/p1q3B1/2b1P1PQ/2P2P2/P3B1KR/8 w - - 0 31
27/87 33:14 17525M 8788K +1.06 Qh8 fxg5 Rh7+ Nxh7 Qxh7+ Kf8 Qh6+ Kf7 Qxg6+ Kf8 Rc6 Bxe2 Qh6+ Kf7 Qh5+ Kf8 Qh8+ Kf7 Qh7+ Kf8 Rxc5 bxc5 Qf5+ Kg7 Qxg5+ Kf8 Qf5+ Kg7 Qe5+ Kf8 Qh8+ Kf7 Qh7+ Ke6 Qh6+ Kf7 e5 Rf8 e6+ Ke8 Qh5+ Kd8 Qf7 Re8 Qf5 Rg8 Qxc5 Bb5 a4 Be8 g5 Rb2+ Kg3 Rd2 f4 Rb2 Qxa5+ Kc8 Qd5 Rf8 a5 Kc7 Qc5+ Kd8
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Re: Test Position 31.Qh8!
+3.31 31. Qh8 fxg5 32. Rh7+ Nxh7 33. Qxh7+ Kf8 34. Qh6+ Kf7 35. Qxg6+ Kf8 36. Qh6+ Kf7 37. Rc6 Bxe2 38. Qh7+ Kf8 39. Rxc5 bxc5 40. Qf5+ Kg7 41. Qxg5+ Kf8 42. Qf5+ Kg7 43. Qe5+ Kf8 44. Qh8+ Kf7 45. Qh5+ Kf8 46. e5 Rb2 47. Qh8+ Kf7 48. Qh7+ Kf8 49. Kg3 e6 50. f4 Bc4 51. f5 exf5 52. gxf5 Re7 53. Qh8+ Bg8 54. Qf6+ Ke8 55. Qc6+ Kd8 56. Qd6+ Ke8 57. e6 Rb1 58. Qc6+ Kf8 59. Qc8+ Kg7 60. Qxc5 Kf6 61. Qd4+ Kxf5 62. Qd3+ Kf6 63. Qxb1 Rg7+ 64. Kf3 Bxe6 65. Qb6 Rg5 66. Qd8+ Kg6 67. a4 Rd5 68. Qe7 Kf5 69. Qf8+ Kg6 70. Ke4 Rg5 71. Qd8 Rf5 72. Kd4 Rg5 73. Qe8+ Kf6 74. Qf8+ Bf7 75. Qd6+ Be6 76. Qf4+ Kg6 77. Ke3 Bb3 78. Qe4+ Kf6 (depth 50, 0:05:59)
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Re: Test Position 31.Qh8!
Qh8 looks the easiest move to the human eye. The only reply for black seems to be fxg5. And it's only after that, that calculation is needed.acase wrote: ↑Sun Apr 28, 2019 12:09 pm In this position, the White Queen moves to h8 so White can bring his rook down to h7 with check. This will be difficult for some engines, and easy for others I would suspect. this position is based on the ERET 84 position after making a few moves..
[d]4rn2/1r2pk2/1p1R1pp1/p1q3B1/2b1P1PQ/2P2P2/P3B1KR/8 w - - 0 31
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Re: Test Position 31.Qh8!
+4.11 31. Qh8 fxg5 32. Rh7+ Nxh7 33. Qxh7+ Kf8 34. Qh6+ Kf7 35. Qxg6+ Kf8 36. Qh6+ Kf7 37. Rc6 Bxe2 38. Qh7+ Kf8 39. Rxc5 bxc5 40. Qf5+ Kg7 41. Qxg5+ Kf8 42. Qf5+ Kg7 43. Qe5+ Kf8 44. Qh8+ Kf7 45. Qh5+ Kf8 46. e5 Rb6 47. Qh8+ Kf7 48. Qh7+ Kf8 49. g5 Bc4 50. g6 Reb8 51. g7+ Ke8 52. g8=Q+ Bxg8 53. Qxg8+ Kd7 54. Qd5+ Ke8 55. f4 e6 56. Qxc5 Kd7 57. Qxa5 Rc6 58. f5 exf5 59. Qd5+ Kc7 60. Qf7+ Kb6 61. e6 Rxc3 62. Qf6 Rcc8 63. Qd4+ Kb7 64. Qd5+ Ka6 65. e7 Kb6 66. Qd6+ Kb7 67. Qd7+ Ka6 68. Kf3 Re8 69. Kf4 Rg8 70. a4 Rge8 71. Qxf5 Kb6 72. Qb5+ Kc7 73. Qe5+ Kc6 74. Qe6+ Kb7 75. Kg5 Ka7 76. Qd7+ Kb6 77. Kg6 Rec8 78. Qb5+ Kc7 79. Qe5+ Kb6 80. Kf7 Rg8 81. Qb5+ Ka7 82. Qc5+ Ka6 83. Kf6 Rgc8 84. Qe5 Ka7 85. Qd4+ Ka6 86. Ke6 Rc6+ 87. Kf5 Rcc8 88. Qe5 Rh8 89. Qd6+ Ka5 90. Qd7 Ka6 91. Kf6 Kb6 92. Qb5+ Kc7 93. Qc5+ Kb7 (depth 65, 3:32:51)zullil wrote: ↑Sun Apr 28, 2019 3:03 pm+3.31 31. Qh8 fxg5 32. Rh7+ Nxh7 33. Qxh7+ Kf8 34. Qh6+ Kf7 35. Qxg6+ Kf8 36. Qh6+ Kf7 37. Rc6 Bxe2 38. Qh7+ Kf8 39. Rxc5 bxc5 40. Qf5+ Kg7 41. Qxg5+ Kf8 42. Qf5+ Kg7 43. Qe5+ Kf8 44. Qh8+ Kf7 45. Qh5+ Kf8 46. e5 Rb2 47. Qh8+ Kf7 48. Qh7+ Kf8 49. Kg3 e6 50. f4 Bc4 51. f5 exf5 52. gxf5 Re7 53. Qh8+ Bg8 54. Qf6+ Ke8 55. Qc6+ Kd8 56. Qd6+ Ke8 57. e6 Rb1 58. Qc6+ Kf8 59. Qc8+ Kg7 60. Qxc5 Kf6 61. Qd4+ Kxf5 62. Qd3+ Kf6 63. Qxb1 Rg7+ 64. Kf3 Bxe6 65. Qb6 Rg5 66. Qd8+ Kg6 67. a4 Rd5 68. Qe7 Kf5 69. Qf8+ Kg6 70. Ke4 Rg5 71. Qd8 Rf5 72. Kd4 Rg5 73. Qe8+ Kf6 74. Qf8+ Bf7 75. Qd6+ Be6 76. Qf4+ Kg6 77. Ke3 Bb3 78. Qe4+ Kf6 (depth 50, 0:05:59)
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Re: Test Position 31.Qh8!
acase wrote: ↑Sun Apr 28, 2019 12:09 pm In this position, the White Queen moves to h8 so White can bring his rook down to h7 with check. This will be difficult for some engines, and easy for others I would suspect. this position is based on the ERET 84 position after making a few moves..
[d]4rn2/1r2pk2/1p1R1pp1/p1q3B1/2b1P1PQ/2P2P2/P3B1KR/8 w - - 0 31
McCain-X3 does get it eventually , after a one false start.
https://github.com/MichaelB7/Stockfish/releases/tag/X3
Code: Select all
dep score nodes time (not shown: tbhits knps seldep)
46 +2.33! 21.4G 14:30.15 Qh8!
46 +2.21? 21.1G 14:20.40 Qh8 fxg5?
45 +2.26 17.6G 12:07.51 Qh8 fxg5 Rh7+ Nxh7 Qxh7+ Kf8 Qh6+ Kf7 Qxg6+ Kf8 Qh6+ Kf7 Rc6 Bxe2 Qh7+ Kf8 Rxc5 bxc5 Qf5+ Kg7 Qxg5+ Kf8 Qf5+ Kg7 Qe5+ Kf8 Qh8+ Kf7 Qh5+ Kf8 e5 Rb2 Qh8+ Kf7 Qh7+ Kf8 Kg3 e6 f4 Bxg4 Kxg4 Re7 Qh8+ Kf7 a4 Rg2+ Kf3 Rg1 Ke4 Rf1 Ke3 c
44 +2.14 16.1G 11:10.51 Qh8 fxg5 Rh7+ Nxh7 Qxh7+ Kf8 Qh6+ Kf7 Qxg6+ Kf8 Qh6+ Kf7 Rc6 Bxe2 Qh7+ Kf8 Rxc5 bxc5 Qf5+ Kg7 Qxg5+ Kf8 Qf5+ Kg7 Qe5+ Kf8 Qh8+ Kf7 Qh5+ Kf8 e5 Rb6 Qf5+ Kg7 e6 Bxf3+ Kg3 Rg8 Qf7+ Kh8 Kxf3 Rg7 Qf5 Kg8 a4 Rb8 Kg3 Rf8 Qxc5 Rf6 Qxa5
44 +1.99! 15.5G 10:44.13 Qh8!
44 +1.88? 14.9G 10:21.62 Qh8 fxg5?
43 +1.93 14.6G 10:10.30 Qh8 fxg5 Rh7+ Nxh7 Qxh7+ Kf8 Qh6+ Kf7 Qxg6+ Kf8 Qh6+ Kf7 Rc6 Bxe2 Qh7+ Kf8 Rxc5 bxc5 Qf5+ Kg7 Qxg5+ Kf8 Qf5+ Kg7 Qe5+ Kf8 Qh8+ Kf7 Qh5+ Kf8 e5 Rb2 Qh8+ Kf7 Qh7+ Kf8 Kg3 e6 f4 Bc4 f5 exf5 gxf5 a4 e6 Rxe6 fxe6 Bxe6 a3 Bb3 Qe4 c4
43 +1.73! 14.3G 9:58.63 Qh8!
43 +1.66? 14.0G 9:44.60 Qh8 fxg5?
43 +1.71? 13.5G 9:25.81 Qh8 fxg5?
42 +1.76 13.4G 9:22.45 Qh8 fxg5 Rh7+ Nxh7 Qxh7+ Kf8 Qh6+ Kf7 Qxg6+ Kf8 Qh6+ Kf7 Rc6 Bxe2 Qh7+ Kf8 Rxc5 bxc5 Qf5+ Kg7 Qxg5+ Kf8 Qf5+ Kg7 Qe5+ Kf8 Qh8+ Kf7 Qh5+ Kf8 e5 Rb2 Qh8+ Kf7 Qh7+ Kf8 Kg3 e6 f4 Bf1 f5 exf5 gxf5 Bc4 Qh6+ Kf7 Qg6+ Kf8 f6 Rxe5 Qg7+ K
42 +1.74! 13.4G 9:19.96 Qh8!
42 +1.55! 12.7G 8:54.31 Qh8!
42 +1.45? 12.4G 8:40.52 Qh8 fxg5?
41 +1.50 12.4G 8:39.03 Qh8 fxg5 Rh7+ Nxh7 Qxh7+ Kf8 Qh6+ Kf7 Qxg6+ Kf8 Qh6+ Kf7 Rc6 Bxe2 Qh7+ Kf8 Rxc5 bxc5 Qf5+ Kg7 Qxg5+ Kf8 Qf5+ Kg7 Qe5+ Kf8 Qh8+ Kf7 Qh5+ Kf8 e5 Rb2 Qh8+ Kf7 Qh7+ Kf8 Kg3 e6 f4 Bxg4 Kxg4 Re7 Qh8+ Kf7 a4 Rg2+ Kf3 Rg1 Ke4 Rf1 Kd3 Rf
41 +1.27! 12.0G 8:26.38 Qh8!
41 +1.06! 11.9G 8:20.71 Qh8!
41 +1.00? 11.8G 8:15.56 Qh8 fxg5?
41 +1.05? 11.8G 8:13.91 Qh8 fxg5?
40 +1.10 11.7G 8:12.12 Qh8 fxg5 Rh7+ Nxh7 Qxh7+ Kf8 Qh6+ Kf7 Qxg6+ Kf8 Qh6+ Kf7 Rc6 Bxe2 Qh7+ Kf8 Rxc5 bxc5 Qf5+ Kg7 Qxg5+ Kf8 Qf5+ Kg7 Qe5+ Kf8 Qh8+ Kf7 Qh5+ Kf8 e5 Rb2 Qh8+ Kf7 Qh7+ Kf8 Kg3 e6 f4 Bxg4 Kxg4 Re7 Qh8+ Kf7 Kf3 a4 Qf6+ Ke8 f5 exf5 e6 Reb
40 +0.70! 11.6G 8:05.93 Qh8!
40 +0.12! 10.0G 7:01.58 Be3 Qc7!
40 +0.15! 10.0G 7:01.44 Qh8!
40 +0.28! 10.0G 7:00.92 Qh8!
40 +0.30! 10.0G 7:00.41 Qh8!
40 +0.48! 9.96G 6:58.41 Qh8!
40 +0.30! 8.46G 5:53.88 Be3!
40 +0.23? 8.04G 5:36.47 Be3 Qc7?
40 +0.31? 7.19G 5:00.02 Be3 Qc7?
40 +0.36? 6.84G 4:45.09 Be3 Qc7?
39 +0.41 5.54G 3:50.72 Be3 Qc7 Rd2 Bxe2 Rxe2 Qc4 Kg3 Qxc3 Qh8 Rd7 Bd2 Qe5+ Bf4 Qxf4+ Kxf4 Ne6+ Ke3 Rxh8 Rxh8 Rc7 Rh7+ Ke8 Kd2 Rd7+ Kc1 Rd3 Rb2 Rc3+ Kd1 Rxf3 Rxb6 Ng5 Rh8+ Kf7 e5 fxe5 Rb5 Ke6 Rxa5 Rf4 Ra6+ Kf7 Raa8 Ke6 Rhe8 Rxg4 Ra7 Rg2 a4 Ra2 Rexe7+ K
39 +0.46! 5.21G 3:36.89 Be3!
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Re: Test Position 31.Qh8!
Komodo 12.3 and lczero (I tried the 42146 network) both get this quickly (under a minute, 4 threads)
Houdini 6.01 didn't
Andrew
Houdini 6.01 didn't
Andrew