Author: Uri Blass
Date: 12:16:56 12/18/02
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On December 18, 2002 at 14:10:04, Art Basham wrote: >In 1964 Tal played...Qd6...! > >I am wondering if any chess programs find it too... > >[D]rnb1k1nr/1p3pbp/p1p3p1/q3p3/2B1PB2/2N2N2/P1PQ1PPP/1R2R1K1 w - - 0 13 > >This is the actual position at move 13... >Taken from the book, "Power Mates"... Based on Deep Fritz and Movei the problem has 3 parts: 1)Find Qd6 2)avoid Qd6 3)Find Qd6 again Deep Fritz finds it at depth 9 lose it at depth 10 and finds it again at depth 12. blass,u - Deep Fritz [D]rnb1k1nr/1p3pbp/p1p3p1/q3p3/2B1PB2/2N2N2/P1PQ1PPP/1R2R1K1 w - - 0 1 Analysis by Deep Fritz: 1.Bxe5-- -+ (-1.53) Depth: 1/5 00:00:00 1.Bg5 h6 ² (0.38) Depth: 4/15 00:00:00 2kN 1.Bg5 h6 ² (0.38) Depth: 4/15 00:00:00 2kN 1.Bg5 h6 ² (0.38) Depth: 4/15 00:00:00 2kN 1.Bg5 h6 ² (0.38) Depth: 4/15 00:00:00 2kN 1.Bg5 h6 ² (0.38) Depth: 4/15 00:00:00 2kN 1.Bg5 h6 ² (0.38) Depth: 4/15 00:00:00 2kN 1.Bg5 h6 ² (0.38) Depth: 4/15 00:00:00 2kN 1.Bg5 h6 ² (0.38) Depth: 4/15 00:00:00 2kN 1.Bg5 b5 2.Bb3 Bg4 3.Re3 = (0.19) Depth: 5/23 00:00:00 22kN 1.Be3! = (0.22) Depth: 5/23 00:00:00 23kN 1.Be3 b5 2.Red1 Bg4 3.Bg5 Nf6 ² (0.34) Depth: 6/24 00:00:00 60kN 1.Be3 Nd7 2.Ng5 Nh6 3.Red1 b5 4.Bb3 ² (0.44) Depth: 7/28 00:00:00 235kN 1.Be3 Nd7 2.Ng5 Nh6 3.Red1 b5 4.Bb3 f5 ² (0.34) Depth: 8/25 00:00:00 435kN 1.Be3 Nd7 2.Ng5 Nh6 3.Red1 b5 4.Bb3 b4 5.Ne2 Kf8 ² (0.41) Depth: 9/28 00:00:02 1290kN 1.Qd6! ² (0.44) Depth: 9/29 00:00:04 2540kN 1.Qd6 f6 2.Bd2 Bf8 3.Qd3 Qc7 4.Red1 b5 5.Bb3 Bc5 ² (0.28) Depth: 10/33 00:00:08 5634kN 1.Be3! ² (0.31) Depth: 10/33 00:00:08 5835kN 1.Be3! Nd7 2.Ng5 Nh6 3.Qd6 Qd8 4.Red1 Bf8 5.Qd3 b6 ² (0.47) Depth: 10/35 00:00:10 6689kN 1.Be3 Nd7 2.Ng5 Nh6 3.Qd6 Qd8 4.Red1 Bf8 5.Qd2 b5 6.Nf3 ² (0.56) Depth: 11/33 00:00:17 11874kN 1.Be3 Nd7 2.Ng5 Nh6 3.Qd6 Qd8 4.Red1 Bf8 5.Qd2 b5 6.Nf3 f5 ² (0.44) Depth: 12/33 00:00:39 27493kN 1.Qd6! ² (0.47) Depth: 12/42 00:01:29 60438kN 1.Qd6! f6 2.Nxe5 fxe5 3.Red1 Bf6 4.Rxb7 Be7 5.Rxe7+ Nxe7 ± (0.97) Depth: 12/42 00:01:50 74340kN 1.Qd6 f6 2.Nxe5 fxe5 3.Red1 Bf6 4.Rxb7 Be7 5.Rxe7+ Nxe7 6.Bg5 ± (0.97) Depth: 13/39 00:03:05 128407kN 1.Qd6! ± (1.28) Depth: 14/39 00:06:40 280950kN 1.Qd6! f6 2.Rxb7 Bxb7 3.Qe6+ Ne7 4.Qf7+ Kd8 5.Rd1+ Nd7 6.Qxg7 Re8 +- (1.47) Depth: 14/44 00:09:40 404964kN (blass, tel-aviv 18.12.2002) Latest Movei(not sure if the best movei) finds it at depth 10,lose it at depth 12 and finds it again at depth 13 but it seems that the main line is wrong because after Qd6 f6 white should play another sacrifice and movei does not see it in it's main line. depth=10 +0.19 d2d6 Nodes: 16456479 NPS: 152163 Time: 00:01:48.15 depth=10 +0.37 d2d6 f7f6 f4d2 g7f8 d6d3 f8c5 c3e2 a5a3 d3a3 c5a3 Nodes: 18365357 NPS: 150683 Time: 00:02:01.88 depth=11 +0.30 d2d6 f7f6 f4d2 g7f8 d6d3 a5c7 c4g8 h8g8 d3c4 c7f7 c4f7 e8f7 b1d1 Nodes: 23189874 NPS: 149188 Time: 00:02:35.44 depth=11 +0.30 d2d6 f7f6 f4d2 g7f8 d6d3 a5c7 c4g8 h8g8 d3c4 c7f7 c4f7 e8f7 b1d1 Nodes: 38536328 NPS: 150591 Time: 00:04:15.90 depth=12 +0.12 d2d6 f7f6 f4d2 g7f8 c3e2 a5a4 d6c7 g8e7 c4b3 a4e4 d2a5 b7b6 a5b6 Nodes: 49354060 NPS: 149385 Time: 00:05:30.38 depth=12 +0.35 f4e3 b8d7 f3g5 g8h6 c3d5 a5d2 d5c7 e8e7 e3d2 a8a7 d2b4 c6c5 c7d5 e7e8 b4a5 b7b5 Nodes: 57232504 NPS: 148159 Time: 00:06:26.29 depth=12 +0.35 f4e3 b8d7 f3g5 g8h6 c3d5 a5d2 d5c7 e8e7 e3d2 a8a7 d2b4 c6c5 c7d5 e7e8 b4a5 b7b5 Nodes: 108530400 NPS: 149819 Time: 00:12:04.41 depth=13 +0.22 f4e3 b8d7 f3g5 g8h6 c3d5 a5d8 d5b6 d7b6 d2d8 e8d8 b1b6 d8e8 e3c5 g7f8 c5e3 Nodes: 122312239 NPS: 149365 Time: 00:13:38.88 depth=13 +0.23 d2d6 Nodes: 167395279 NPS: 149572 Time: 00:18:39.16 depth=13 +0.24 d2d6 f7f6 f4d2 g7f8 d6d3 a5c7 c4g8 h8g8 d3c4 g8g7 d2h6 g7f7 h6e3 Nodes: 194160978 NPS: 149540 Time: 00:21:38.38
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