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Up Topic The Rybka Lounge / Test Positions / Rg6+ is good, but Kc4 is better.
- - By user923005 (****) [us] Date 2015-12-15 21:56
1r1b2R1/8/3pk3/1P1Np3/4P3/3K4/8/8 w - -


This is from the London Chess Classic.
Parent - By Peter Grayson (****) [gb] Date 2015-12-16 09:58
Ran this on my older overclocked Q9550 quad machine. No problem for the top engines with ...

Houdini 4 Pro + GTB - 3 seconds,
Komodo 9.3 - 8 seconds and
Stockfish 121215 taking the longest at 45 seconds.
All with 4Gb hash.
I've gone back to using GTB's for Houdini 4 because it gives a more reliable endgame output than with 5 man Syzygy bases.

PeterG
Parent - By kgburcham (***) [us] Date 2015-12-19 13:21
1r1b2R1/8/3pk3/1P1Np3/4P3/3K4/8/8 w - -


Engine: Stockfish 141215 64 BMI2 (4096 MB)
by T. Romstad, M. Costalba, J. Kiiski, G.
Found 172 tablebases.

26/49   0:05   +0.53++  1.Kc4 (113.472.067) 20612  TB:902.687
26/49   0:05   +0.60++  1.Kc4 (115.236.437) 20647  TB:908.797
26/49   0:05   +0.70++  1.Kc4 (116.938.328) 20689  TB:914.218
26/49   0:05   +0.85++  1.Kc4 (121.867.139) 20792  TB:931.475
26/49   0:06   +1.05++  1.Kc4 (132.094.010) 20980  TB:968.983
26/49   0:06   +1.32++  1.Kc4 (136.059.110) 21032  TB:984.607
26/49   0:06   +1.68++  1.Kc4 (143.339.635) 21163  TB:1.013.693
26/49   0:06   +1.68   1.Kc4 Kd7 2.Rg7+ Ke6 3.Kb4 Ba5+ 4.Kxa5 Rxb5+ 5.Ka4 Ra5+ 6.Kb3 Ra3+ 7.Kc2 Ra2+ 8.Kc3 Rc2+ 9.Kb3 Rb2+ 10.Kc4 Rc2+ 11.Nc3 Rh2 12.Rg6+ Kd7 13.Nd5 Rc2+ 14.Kd3 (144.731.664) 21187  TB:1.018.906
27/51   0:06   +1.68   1.Kc4 Kd7 2.Rg7+ Ke6 3.Kb4 Ba5+ 4.Kxa5 Rxb5+ 5.Ka4 Ra5+ 6.Kb3 Ra3+ 7.Kc2 Ra2+ 8.Kc3 Rc2+ 9.Kb3 Rb2+ 10.Kc4 Rc2+ 11.Nc3 Rh2 12.Rg6+ Kd7 13.Nd5 Rc2+ 14.Kd3 (146.310.498) 21204  TB:1.026.839
28/57   0:07   +1.75++  1.Kc4 (156.693.752) 21345  TB:1.078.986
28/57   0:07   +1.75   1.Kc4 Kd7 2.Rg7+ Ke6 3.Kb4 Ba5+ 4.Kxa5 Rxb5+ 5.Ka4 Ra5+ 6.Kb3 Ra3+ 7.Kc2 Ra2+ 8.Kc3 Rc2+ 9.Kb3 Rb2+ 10.Kc4 Rc2+ 11.Nc3 Rh2 12.Rg6+ Kd7 13.Nd5 Rc2+ 14.Kd3 (157.936.226) 21368  TB:1.082.350
29/57   0:07   +1.75   1.Kc4 Kd7 2.Rg7+ Ke6 3.Kb4 Ba5+ 4.Kxa5 Rxb5+ 5.Ka4 Ra5+ 6.Kb3 Ra3+ 7.Kc2 Ra2+ 8.Kc3 Rc2+ 9.Kb3 Rb2+ 10.Kc4 Rc2+ 11.Nc3 Rh2 12.Rg6+ Kd7 13.Nd5 Rc2+ 14.Kd3 (161.697.076) 21422  TB:1.099.480
30/62   0:08   +1.75   1.Kc4 Kd7 2.Rg7+ Ke6 3.Kb4 Ba5+ 4.Kxa5 Rxb5+ 5.Ka4 Ra5+ 6.Kb3 Ra3+ 7.Kc2 Ra2+ 8.Kc3 Ra3+ 9.Kc4 Ra4+ 10.Nb4 Ra1 11.Rg6+ Kd7 12.Nd5 Rc1+ 13.Kd3 Kc6 14.Rg7 (187.045.808) 21848  TB:1.249.932
31/62   0:08   +1.82   1.Kc4 Kd7 2.Rg7+ Ke6 3.Kb4 Ba5+ 4.Kxa5 Rxb5+ 5.Ka4 Ra5+ 6.Kb3 Ra3+ 7.Kc2 Ra2+ 8.Kc3 Ra3+ 9.Kc4 Ra4+ 10.Nb4 Ra1 11.Rg6+ Kd7 12.Nd5 Rc1+ 13.Kd3 Kc6 14.Rg7 (188.933.433) 21872  TB:1.257.351
32/62   0:08   +1.82   1.Kc4 Kd7 2.Rg7+ Ke6 3.Kb4 Ba5+ 4.Kxa5 Rxb5+ 5.Ka4 Ra5+ 6.Kb3 Ra3+ 7.Kc2 Ra2+ 8.Kc3 Ra3+ 9.Kc4 Ra4+ 10.Nb4 Ra1 11.Rg6+ Kd7 12.Nd5 Rc1+ 13.Kd3 Kc6 14.Rg7 (189.093.067) 21873  TB:1.258.075
33/62   0:08   +1.82   1.Kc4 Kd7 2.Rg7+ Ke6 3.Kb4 Ba5+ 4.Kxa5 Rxb5+ 5.Ka4 Ra5+ 6.Kb3 Ra3+ 7.Kc2 Ra2+ 8.Kc3 Ra3+ 9.Kc4 Ra4+ 10.Nb4 Ra1 11.Rg6+ Kd7 12.Nd5 Rc1+ 13.Kd3 Kc6 14.Rg7 (189.488.171) 21873  TB:1.260.471
34/62   0:08   +1.82   1.Kc4 Kd7 2.Rg7+ Ke6 3.Kb4 Ba5+ 4.Kxa5 Rxb5+ 5.Ka4 Ra5+ 6.Kb3 Ra3+ 7.Kc2 Ra2+ 8.Kc3 Ra3+ 9.Kc4 Ra4+ 10.Nb4 Ra1 11.Rg6+ Kd7 12.Nd5 Rc1+ 13.Kd3 Kc6 14.Rg7 (197.179.816) 21923  TB:1.305.370
35/62   0:09   +1.82   1.Kc4 Kd7 2.Rg7+ Ke6 3.Kb4 Ba5+ 4.Kxa5 Rxb5+ 5.Ka4 Ra5+ 6.Kb3 Ra3+ 7.Kc2 Ra2+ 8.Kc3 Ra3+ 9.Kc4 Ra4+ 10.Nb4 Ra1 11.Rg6+ Kd7 12.Nd5 Rc1+ 13.Kd3 Kc6 14.Rg7 (218.020.758) 22100  TB:1.447.784
36/62   0:11   +1.89++  1.Kc4 (263.032.069) 22514  TB:1.715.517
36/62   0:14   +1.96++  1.Kc4 (348.353.782) 23466  TB:2.214.529
36/62   0:16   +2.06++  1.Kc4 (382.749.693) 23729  TB:2.377.858
36/62   0:18   +2.21++  1.Kc4 (434.359.336) 24094  TB:2.615.443
36/62   0:20   +2.41++  1.Kc4 (491.669.396) 24466  TB:2.944.829
36/62   0:22   +2.68++  1.Kc4 (565.619.054) 24757  TB:3.307.494
36/62   0:24   +3.04++  1.Kc4 (620.678.802) 25029  TB:3.473.814
36/62   0:28   +3.50++  1.Kc4 (707.861.037) 25213  TB:3.797.567
36/62   0:31   +4.10++  1.Kc4 (797.579.410) 25324  TB:4.144.614
36/62   0:35   +4.87++  1.Kc4 (916.293.490) 25512  TB:4.583.262
36/62   0:43   +5.85++  1.Kc4 (1.122.286.238) 25679  TB:5.384.905
36/62   0:55   +7.09++  1.Kc4 (1.443.467.473) 25990  TB:6.627.545
36/69   1:10   +8.66++  1.Kc4 (1.849.370.747) 26116  TB:8.652.361
Up Topic The Rybka Lounge / Test Positions / Rg6+ is good, but Kc4 is better.

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