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Subject: A difficult position: only Rybka finds the solution...

Author: Ernest Bonnem
Date: 07:08:38 12/15/05
From the German CSS Forum (Frank v/d Muysenberg, 30 July 2005):

[D]r3r1k1/npq1pp1p/6p1/p1P2bN1/5P2/1P4P1/PQ4BP/2R2RK1 w - - 0 1

at the time no program could find 1.g4!
... except Shredder 6 Paderborn (5 hours on P4-2.53GHz)

6 months later, I am told Fritz 9, on Athlon64-2.4GHz, also gets it , in over 5
hours.

But look at Rybka, on my "slow" AMD mobile 1.66GHz, 256MB hash:

VP (Default: Very Positional):
Rybka Beta 107 min     Rybka Preview 89 min
SP (Default: Slightly Positional):
Rybka Beta  47 min     Rybka Preview 47 min
ST (Default: Slightly Tactical):
Rybka Beta 125 min
VT (Default: Very Tactical):
Rybka Beta  84 min



r3r1k1/npq1pp1p/6p1/p1P2bN1/5P2/1P4P1/PQ4BP/2R2RK1 w - - 0 1
VP
Rybka Beta
  7.00	 0:00 	+0.72 	1.Bd5 e6 2.Ne4 Bxe4 (31.041) 39
  8.00	 0:01 	+0.74 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 (75.180) 43
  9.00	 0:03 	+0.70 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 (140.951) 47
 10.00	 0:06 	+0.74 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 Red8 (310.351) 51
 11.01	 0:11 	+0.63 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 Rad8 5.Qc3 (611.449)
55
 12.01	 0:27 	+0.53 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 Rad8 5.a3 Rxd1
(1.504.058) 55
 12.02	 0:29 	+0.65 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(1.647.453) 58
 13.01	 0:52 	+0.78 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(3.018.412) 59
 14.01	 1:18 	+0.66 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(4.674.604) 60
 15.01	 2:43 	+0.81 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(9.618.660) 60
 16.01	 4:25 	+0.75 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(15.907.947) 61
 17.01	 9:28 	+0.83 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(34.282.191) 61
 18.01	18:33 	+0.61 	1.Qe5 Qxe5 2.fxe5 Rab8 3.g4 Bxg4 4.Rxf7 h6 5.Rf4 Bc8
(68.166.835) 62
 19.01	51:00 	+0.50 	1.Qe5 Qxe5 2.fxe5 Rab8 3.g4 (177.795.933) 59
 19.13	107:20 	+1.15 	1.g4 Bxg4 2.Bd5 e6 3.Ne4 f5 4.Nf6+ (341.653.213) 54
 20.01	150:04 	+1.21 	1.g4 Bxg4 2.Bd5 e6 (458.628.701) 52
best move: g3-g4 time: 152:19.132 min  n/s: 52.283  nodes: 466.575.360
Rybka Preview
  7.00	 0:00 	+0.72 	1.Bd5 e6 2.Ne4 Bxe4 (31.041) 36
  8.00	 0:01 	+0.74 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 (75.180) 42
  9.00	 0:03 	+0.70 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 (140.951) 47
 10.00	 0:06 	+0.74 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 Red8 (310.351) 51
 11.01	 0:11 	+0.63 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 Rad8 5.Qc3 (611.479)
55
 12.01	 0:27 	+0.53 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 Rad8 5.a3 Rxd1
(1.504.072) 57
 12.02	 0:29 	+0.65 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4 6.Ne4
(1.647.467) 58
 13.01	 0:51 	+0.78 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4 6.Ne4
f5 (3.018.454) 60
 14.01	 1:18 	+0.66 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4 6.Ne4
f5 7.exf6 (4.674.681) 61
 15.01	 2:40 	+0.81 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4 6.Ne4
f5 7.exf6 Red8 (9.618.816) 61
 16.01	 4:22 	+0.75 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4 6.Ne4
f5 7.exf6 Red8 (15.909.078) 62
 17.01	 9:22 	+0.83 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4 6.Ne4
f5 7.exf6 Red8 (34.289.317) 62
 18.01	18:22 	+0.61 	1.Qe5 Qxe5 2.fxe5 Rab8 3.g4 Bxg4 4.Rxf7 h6 5.Rf4 Bc8 6.Nf7
Kg7 7.Bd5 Bf5 (68.177.224) 63
 19.01	50:52 	+0.65 	1.Qe5 Qxe5 2.fxe5 Rab8 3.Rf4 h6 4.Nf3 Nc6 (179.157.676) 60
 19.13	89:10 	+1.00 	1.g4 Bxg4 2.Bd5 e6 3.Ne4 f5 (287.862.272) 55
 20.01	135:03 	+1.01 	1.g4 Bxg4 2.Bd5 (415.351.759) 52
best move: g3-g4 time: 222:50.896 min  n/s: 51.250  nodes: 669.122.560
SP
Rybka Beta
  7.00	 0:00 	+0.72 	1.Bd5 e6 2.Ne4 Bxe4 (31.127) 46
  8.00	 0:01 	+0.74 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 (75.315) 47
  9.00	 0:02 	+0.70 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 (141.228) 49
 10.00	 0:06 	+0.74 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 Red8 (311.794) 50
 11.01	 0:12 	+0.63 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 Rad8 5.Qc3 (618.554)
56
 12.01	 0:29 	+0.53 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 Rad8 5.a3 Rxd1
(1.496.029) 53
 12.02	 0:31 	+0.65 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(1.640.178) 54
 13.01	 0:54 	+0.78 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(2.989.519) 56
 14.01	 1:24 	+0.66 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(4.673.075) 56
 15.01	 2:55 	+0.81 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(9.475.840) 55
 16.01	 4:53 	+0.75 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(15.903.688) 55
 17.01	10:35 	+0.83 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(34.247.396) 55
 18.01	20:42 	+0.61 	1.Qe5 Qxe5 2.fxe5 Rab8 3.g4 Bxg4 4.Rxf7 h6 5.Rf4 Bc8
(66.562.397) 54
 18.13	47:10 	+0.86 	1.g4 Bxg4 2.Bd5 e6 3.Ne4 f5 4.Nf6+ Kf7 5.Nxe8 Rxe8
(127.939.791) 46
 19.01	68:52 	+1.05 	1.g4 Bxg4 2.Bd5 e6 3.Ne4 f5 (179.252.082) 44
best move: g3-g4 time: 71:17.330 min  n/s: 44.316  nodes: 185.065.472
Rybka Preview
  7.00	 0:00 	+0.72 	1.Bd5 e6 2.Ne4 Bxe4 (31.127) 45
  8.00	 0:01 	+0.74 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 (75.315) 46
  9.00	 0:02 	+0.70 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 (141.228) 49
 10.00	 0:06 	+0.74 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 Red8 (311.794) 51
 11.01	 0:11 	+0.63 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 Rad8 5.Qc3 (618.568)
56
 12.01	 0:28 	+0.53 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 Rad8 5.a3 Rxd1
(1.496.043) 53
 12.02	 0:30 	+0.65 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4 6.Ne4
(1.640.192) 56
 13.01	 0:54 	+0.78 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4 6.Ne4
f5 (2.989.561) 57
 14.01	 1:23 	+0.66 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4 6.Ne4
f5 7.exf6 (4.673.175) 57
 15.01	 2:52 	+0.81 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4 6.Ne4
f5 7.exf6 Red8 (9.476.005) 56
 16.01	 4:49 	+0.75 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4 6.Ne4
f5 7.exf6 Red8 (15.903.795) 56
 17.01	10:25 	+0.83 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4 6.Ne4
f5 7.exf6 Red8 (34.250.575) 56
 18.01	20:25 	+0.61 	1.Qe5 Qxe5 2.fxe5 Rab8 3.g4 Bxg4 4.Rxf7 h6 5.Rf4 Bc8 6.Nf7
Kg7 7.Bd5 Bf5 (66.563.379) 55
 18.13	46:49 	+0.93 	1.g4 Bxg4 2.Bd5 e6 3.Ne4 f5 4.Nf6+ Kf7 5.Bg2 Nc6 6.Nxe8
Rxe8 7.Bxc6 bxc6 (128.971.136) 47
best move: g3-g4 time: 51:42.802 min  n/s: 46.826  nodes: 141.836.288
ST
Rybka Beta
  7.00	 0:00 	+0.72 	1.Bd5 e6 2.Ne4 Bxe4 (42.468) 55
  8.00	 0:01 	+0.74 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 (102.237) 55
  9.00	 0:03 	+0.70 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 (210.916) 58
 10.00	 0:07 	+0.74 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 Red8 (473.081) 62
 11.01	 0:14 	+0.63 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 Rad8 5.Qc3 (913.687)
65
 12.01	 0:36 	+0.47 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Rad8 4.Qe5 Qd7 5.Qd6 Qxd6
(2.283.641) 65
 12.02	 0:39 	+0.65 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(2.472.236) 65
 13.01	 1:07 	+0.78 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(4.418.660) 67
 14.01	 1:41 	+0.66 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(6.805.548) 68
 15.01	 3:29 	+0.81 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(14.049.615) 68
 16.01	 5:50 	+0.75 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(23.743.155) 69
 17.01	11:59 	+0.83 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(48.069.662) 68
 18.01	21:00 	+0.67 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 Red8 4.Bxf7+ Kg7 5.Be6 Nd4
(83.560.192) 67
 19.01	58:51 	+0.56 	1.Qe5 Qxe5 2.fxe5 Rab8 3.h3 Nc6 4.g4 Be6 5.Nxe6 fxe6
(237.993.011) 69
 19.13	124:44 	+0.90 	1.g4 Bxg4 2.Bd5 e6 3.Ne4 f5 (463.756.772) 63
best move: g3-g4 time: 174:39.338 min  n/s: 61.709  nodes: 631.472.128
VT
Rybka Beta
  6.00	 0:00 	+0.80 	1.Qe5 Qxe5 2.fxe5 Nc6 (11.243) 36
  7.00	 0:00 	+0.66 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 (32.812) 45
  7.00	 0:00 	+0.72 	1.Bd5 e6 2.Ne4 Bxe4 (42.496) 45
  8.00	 0:02 	+0.74 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 (102.109) 48
  9.00	 0:04 	+0.70 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 (211.051) 53
 10.00	 0:08 	+0.74 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Nc6 4.Rcd1 Red8 (467.784) 58
 11.01	 0:17 	+0.48 	1.Bd5 e6 2.Bf3 Red8 3.Ne4 Bxe4 4.Bxe4 Nb5 5.a4 (1.023.432)
60
 12.01	 0:58 	+0.47 	1.Bd5 e6 2.Ne4 Bxe4 3.Bxe4 Rad8 4.Qe5 Qd7 5.Qd6 Qxd6
(3.390.629) 59
 12.02	 1:00 	+0.65 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(3.548.567) 60
 13.01	 1:29 	+0.78 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(5.537.580) 63
 14.01	 2:09 	+0.66 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(8.187.080) 64
 15.01	 4:03 	+0.81 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(15.532.125) 65
 16.01	 6:43 	+0.75 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(26.126.969) 66
 17.01	13:24 	+0.83 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 e6 4.Bxc6 bxc6 5.g4 Bxg4
(51.632.342) 65
 18.01	23:59 	+0.61 	1.Qe5 Qxe5 2.fxe5 Nc6 3.Bd5 Red8 4.Bxf7+ Kg7 5.Be6 Nd4
(91.719.752) 65
 18.13	55:42 	+0.91 	1.g4 Bxg4 2.Bd5 e6 3.Ne4 f5 (184.321.913) 56
 19.01	84:18 	+1.03 	1.g4 Bxg4 2.Bd5 e6 3.Ne4 f5 (272.004.452) 55
 20.01	154:10 	+1.06 	1.g4 Bxg4 2.Bd5 e6 (480.577.815) 53
best move: g3-g4 time: 224:34.605 min  n/s: 53.731  nodes: 706.945.024
Re: A difficult position: only Rybka finds the solution... Eelco de Groot 19:54:44 12/15/05
Re: A difficult position: only Rybka finds the solution... Richard Pijl 07:53:48 12/15/05
- Re: A difficult position: only Rybka finds the solution... Richard Pijl 01:32:56 12/16/05
- Re: A difficult position: only Rybka finds the solution... Johan Havegheer 08:00:43 12/15/05
  - Re: A difficult position: only Rybka finds the solution... Richard Pijl 01:35:58 12/16/05
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