Rybka 4 vs Houdini 1.02 - Long TC Match - LIVE BROADCAST

[M ANSARI]

Hi Martin,

I think the good EGTB's are the 22GB provided by the CD Turbo EGTB DVD's. For R4, I think it was tuned with the the knowledge that some 6 piece EGTB's are there ... since it is available for the cluster and R4 is just a modified engine produced for a Rybka cluster slave. I am still not sure which are the critical EGTB's to install, but I think someone posted something on that in the Rybka forum.

[pacifist]

Yes Rybka was winning in the last game but bad result is easily explained by the bad rook endgame knowledge. At any moment Rybka could swicth to a rook + 2 pawns vs rook endgame and since this seemed ok Rybka was making circles around this possibility. If he knew that it was draw under those circumstances he could have chosen another "winning" line. Same happened with the fortress and the exchange up some games before. For the moment most engines should learn those imbalanced fortress or drawn positions. If it's interesting from a competitive point of view is another problem but at those LTC games I think it should be doable.

Houdini easily found the way to draw yesterday but ha was forced in that direction. I don't know if engines could "learn" to swicth sides and find a way for opponent to hold and then reject that variation...But I'm digressing

[M ANSARI]

Yes Rybka was winning in the last game but bad result is easily explained by the bad rook endgame knowledge. At any moment Rybka could swicth to a rook + 2 pawns vs rook endgame and since this seemed ok Rybka was making circles around this possibility. If he knew that it was draw under those circumstances he could have chosen another "winning" line. Same happened with the fortress and the exchange up some games before. For the moment most engines should learn those imbalanced fortress or drawn positions. If it's interesting from a competitive point of view is another problem but at those LTC games I think it should be doable.

Houdini easily found the way to draw yesterday but ha was forced in that direction. I don't know if engines could "learn" to swicth sides and find a way for opponent to hold and then reject that variation...But I'm digressing

I think you are right that R4 will go into many drawn rook endgames with a high evaluation, but in the case of the last game it was something totally different. Most likely it was a poor move due to a "stall" bug that is one of the reasons there will be a Rybka 4 update. Check my analysis here


In this position


[d]8/8/1R2k1p1/4P2p/6pP/1p1r4/1P4K1/8 b - - 0 63


Rybka 4 played the incredible instantly drawing move Kf7??? This could be that EGTB's are not working or simply Rybka is suffering from the MPV bug that also seems to dramatically slow down search in some endgames. I checked how long Rybka sat on this move and it was more than a minute on very fast hardware. Here is a clip analysis on a much slower computer using only 32bits.

New game

[d]8/8/1R2k1p1/4P2p/6pP/1p1r4/1P4K1/8 b - - 0 1

Analysis by Deep Rybka 4 w32:

63...Kf5 64.Rf6+ Kxe5 65.Rxg6 Rd2+ 66.Kg3 Rxb2 67.Rg5+ Ke4
-+ (-2.28 !) Depth: 6 00:00:00 2kN
63...Kf5 64.Rf6+ Kxe5 65.Rxg6 Rd2+ 66.Kg3 Rxb2 67.Rg5+ Ke4
-+ (-2.43 !) Depth: 6 00:00:00 2kN
63...Kf5 64.Rf6+ Kxe5 65.Rxg6 Rd2+ 66.Kg3 Rxb2 67.Rg5+ Ke4 68.Rxh5 Rd2
-+ (-2.52) Depth: 6 00:00:00 3kN
63...Kf5 64.Rf6+ Kxe5 65.Rxg6 Rd2+ 66.Kg3 Rxb2 67.Rg5+ Ke4 68.Rxh5 Rd2 69.Rb5 b2 70.h5 Re2 71.h6
-+ (-2.64 !) Depth: 7 00:00:00 8kN
63...Kf5 64.e6 Kf6 65.Kf1 Rh3 66.e7+ Kxe7 67.Kg2 Kf7 68.Rb7+ Ke6 69.Rb6+ Kf5 70.Rb5+
-+ (-2.73) Depth: 7 00:00:00 11kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Ke4 68.Rh6
-+ (-2.79 !) Depth: 7 00:00:00 12kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rb1
-+ (-3.19 !) Depth: 7 00:00:00 14kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rb1 68.Rh8 Rg1+ 69.Kf4 b2 70.Rd8+ Kc3 71.Rc8+ Kb3 72.Rb8+ Kc2 73.Rc8+
-+ (-3.20) Depth: 7 00:00:00 17kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rb1 68.Rh8 Rg1+ 69.Kf4 b2 70.Rd8+ Kc3 71.Rc8+ Kb3 72.Rb8+ Kc2 73.Rc8+
-+ (-3.20) Depth: 8 00:00:00 20kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rh6 Kd4 67.Rd6+ Kc5 68.Rh6 Rb1 69.Rxh5+ Kd4 70.Rh8 Rg1+ 71.Kf4 b2 72.Rd8+ Kc3 73.Rc8+ Kb3 74.Rb8+ Kc2 75.Rc8+ Kd3
-+ (-3.20) Depth: 9 00:00:00 29kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rh6 Kd4 67.Rd6+ Kc5 68.Rh6 Rb1 69.Rxh5+ Kc4 70.Kg2 b2
-+ (-3.32 !) Depth: 10 00:00:01 41kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rh6 Kd4 67.Rd6+ Kc5 68.Rh6 Rb1 69.Rxh5+ Kc4 70.Kg2 b2
-+ (-3.47 !) Depth: 10 00:00:01 56kN
63...Kxe5 64.Rxg6 Rd2+[] 65.Kg3 Rxb2[] 66.Rh6 Rb1 67.Rxh5+ Kd4 68.Rh8 Rg1+ 69.Kf4 b2 70.Rd8+ Kc3 71.Rc8+ Kb3 72.Rb8+ Kc2 73.Rc8+ Kd3 74.Rd8+ Ke2 75.Re8+ Kf2
-+ (-3.55) Depth: 10 00:00:01 74kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2[] 66.Rh6 Rb1 67.Rxh5+ Kd4 68.Rh8 Rg1+ 69.Kf4 b2 70.Rd8+ Kc3 71.Rc8+ Kb3 72.Rb8+ Kc2 73.Rc8+ Kd3 74.Rd8+ Ke2 75.Re8+ Kf2
-+ (-3.55) Depth: 11 00:00:01 88kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2[] 66.Rh6 Rb1 67.Rxh5+ Kd4 68.Rh8 Rg1+ 69.Kf4 b2
-+ (-3.67 !) Depth: 12 00:00:01 147kN, tb=4
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2[] 66.Rh6 Rb1 67.Rxh5+ Kd4 68.Rh8 Rg1+ 69.Kf4 b2
-+ (-3.82 !) Depth: 12 00:00:01 213kN, tb=7
63...Kxe5 64.Kf1 Kf4[] 65.Ke2 Re3+[] 66.Kd2 Rh3 67.Rb4+ Kg3 68.Rxb3+ Kxh4 69.Rb6[] g5 70.Rb4 Kg3 71.Rb6 h4 72.Rb3+ Kf4 73.Rb4+ Kf5 74.Rb5+
-+ (-4.03) Depth: 12 00:00:02 331kN, tb=13
63...Kxe5 64.Kf1 Kf4[] 65.Ke2 Re3+ 66.Kd2 Rh3 67.Rb4+ Kg3 68.Rxb3+ Kxh4 69.Rb6[] g5 70.Rb4 Kg3 71.Rb6 h4 72.Rb3+ Kf4 73.Rb4+ Kf5 74.Rb5+
-+ (-4.03) Depth: 13 00:00:02 355kN, tb=17
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rb1 68.Rb5 b2 69.Kxg4 Kc4 70.Rb6 Kc5 71.Rb8 Rg1+ 72.Kf5 Rf1+ 73.Kg4 b1Q 74.Rxb1 Rxb1 75.h5 Rg1+ 76.Kf5 Rf1+ 77.Kg5
-+ (-3.97) Depth: 14 00:00:02 420kN, tb=24
63...Kf5 64.e6 Kf6[] 65.Kf1 Ke7[] 66.Rb7+ Kxe6[] 67.Rb6+ Ke5 68.Ke2 Rh3[] 69.Kf1 Rxh4 70.Rxb3 Rh2 71.Kg1 Rd2 72.Rb5+ Kf6 73.Rb6+ Kg5 74.Rb5+ Kh4 75.Rb6 g5 76.b4 Kg3 77.Kf1 h4
-+ (-3.76) Depth: 15 00:00:06 967kN, tb=110
63...Kf5 64.e6 Kf6[] 65.Kf1 Ke7[] 66.Rb7+ Kxe6[] 67.Rb8 Kf5 68.Rb4 Rd1+ 69.Ke2 Rh1 70.Rb5+ Kf4 71.Rb4+ Kg3[] 72.Rxb3+ Kxh4 73.Rb6 g3 74.Rxg6 Rh2+ 75.Kf3 Rxb2 76.Rg7 Rf2+ 77.Ke3 Kh3 78.Rg5 h4
-+ (-3.86) Depth: 16 00:00:10 1758kN, tb=191
63...Kf5 64.Rf6+[] Kxe5 65.Rxg6 Rd2+ 66.Kg3 Rxb2 67.Rg5+ Kd4 68.Rxh5[] Rd2 69.Rb5 b2[] 70.Rb7 Kc4 71.Rc7+ Kb3 72.Rb7+ Kc4 73.Rc7+ Kb3 74.Rb7+ Kc4 75.Rc7+ Kb3 76.Rb7+ Kc4 77.Rc7+ Kb3 78.Rb7+ Kc4
-+ (-2.70) Depth: 17 00:00:19 3067kN, tb=686
63...Kf5 64.Rf6+[] Kxe5 65.Rxg6 Rd2+ 66.Kg3[] Rxb2 67.Rh6 Kd4 68.Rxh5 Rd2 69.Rf5 b2 70.Rf1 Kc3 71.h5 Rd4
-+ (-2.70) Depth: 18 00:00:19 3186kN, tb=720
63...Kf5 64.Rf6+[] Kxe5[] 65.Rxg6[] Rd2+ 66.Kg3 Ke4 67.Rh6 Rd5 68.Kg2 Rd2+ 69.Kg3[] Rd5 70.Kg2 Rd2+ 71.Kg3[] Rd5 72.Kg2 Rd2+ 73.Kg3[] Rd5 74.Kg2 Rd2+ 75.Kg3[] Rd5 76.Kg2 Rd2+ 77.Kg3[] Rd5 78.Kg2 Rd2+
-+ (-2.82 !) Depth: 19 00:00:29 3950kN, tb=1534
63...Kf5 64.Rf6+[] Kxe5[] 65.Rxg6[] Rd2+ 66.Kg3 Ke4 67.Re6+ Kd3 68.Rh6 Rxb2 69.Rxh5 Ra2 70.Rd5+ Kc4 71.Rd1 Kc3 72.Kxg4 Ra4+ 73.Kg5 Ra5+ 74.Kg4 Ra8 75.Rb1 Kc2 76.Rxb3 Kxb3
-+ (-2.80) Depth: 19 00:00:33 4416kN, tb=2126
63...Kf5 64.Rf6+[] Kxe5[] 65.Rxg6[] Rd2+ 66.Kg3 Ke4 67.Re6+ Kd3 68.Rh6 Rxb2 69.Rxh5 Ra2 70.Rd5+ Kc4 71.Rd1 Kc3 72.Kxg4 Ra4+ 73.Kg5 Ra5+ 74.Kg4 Ra8 75.Rb1 Kc2 76.Rxb3 Kxb3
-+ (-2.92 !) Depth: 20 00:00:35 4790kN, tb=2190
63...Kf5 64.Rf6+[] Kxe5[] 65.Rxg6[] Rd2+ 66.Kg3 Ke4 67.Re6+ Kd3 68.Rh6 Rxb2 69.Rxh5 Ra2 70.Rd5+ Kc4 71.Rd1 Kc3 72.Kxg4 Ra4+ 73.Kg5 Ra5+ 74.Kg4 Ra8 75.Rb1 Kc2 76.Rxb3 Kxb3
-+ (-3.07 !) Depth: 20 00:00:38 5354kN, tb=2548
63...Kf5 64.Rf6+[] Kxe5[] 65.Rxg6[] Rd2+ 66.Kg3 Ke4 67.Re6+ Kd3 68.Rh6 Rxb2 69.Rxh5 Ra2 70.Rd5+ Kc4 71.Rd1 Kc3 72.Kxg4 Ra4+ 73.Kg5 Ra5+ 74.Kg4 Ra8 75.Rb1 Kc2 76.Rxb3 Kxb3
-+ (-3.47 !) Depth: 20 00:00:46 7005kN, tb=3186
63...Kf5 64.e6 Kf6[] 65.Kf1 Ke7 66.Rb7+ Kxe6[] 67.Rb8 Kf5 68.Ke2 Rh3 69.Kf1 Rxh4 70.Rb5+ Kf6 71.Rb6+ Kf5 72.Rb5+ Kf6 73.Rb6+ Kf5 74.Rb5+ Kf6 75.Rb6+ Kf5 76.Rb5+ Kf6 77.Rb6+ Kf5 78.Rb5+ Kf6
-+ (-4.22) Depth: 20 00:01:29 15278kN, tb=5593

(, 07.07.2010)

And here is clip analysis after Kf7?

New game

[d]8/5k2/1R4p1/4P2p/6pP/1p1r4/1P4K1/8 w - - 0 1


Analysis by Deep Rybka 4 w32:

64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+ Kg8 67.Rb8+ Kg7 68.Rb7+ Kg8 69.Rb8+ Kg7 70.Rb7+ Kg8 71.Rb8+ Kg7 72.Rb7+ Kg8 73.Rb8+ Kg7 74.Rb7+ Kg8 75.Rb8+ Kg7 76.Rb7+ Kg8 77.Rb8+ Kg7 78.Rb7+ Kg8 79.Rb8+
-/+ (-1.25) Depth: 6 00:00:00 1kN
64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+ Kg8 67.Rb8+ Kg7 68.Rb7+ Kg8 69.Rb8+ Kg7 70.Rb7+ Kg8 71.Rb8+ Kg7 72.Rb7+ Kg8 73.Rb8+ Kg7 74.Rb7+ Kg8 75.Rb8+ Kg7 76.Rb7+ Kg8 77.Rb8+ Kg7 78.Rb7+ Kg8 79.Rb8+
-/+ (-1.13 !) Depth: 7 00:00:00 1kN
64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+ Kg8 67.Rb8+ Kg7 68.Rb7+ Kg8 69.Rb8+ Kg7 70.Rb7+ Kg8 71.Rb8+ Kg7 72.Rb7+ Kg8 73.Rb8+ Kg7 74.Rb7+ Kg8 75.Rb8+ Kg7 76.Rb7+ Kg8 77.Rb8+ Kg7 78.Rb7+ Kg8 79.Rb8+
-/+ (-0.98 !) Depth: 7 00:00:00 1kN
64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+ Kg8 67.Rb8+ Kg7 68.Rb7+ Kg8 69.Rb8+ Kg7 70.Rb7+ Kg8 71.Rb8+ Kg7 72.Rb7+ Kg8 73.Rb8+ Kg7 74.Rb7+ Kg8 75.Rb8+ Kg7 76.Rb7+ Kg8 77.Rb8+ Kg7 78.Rb7+ Kg8 79.Rb8+
-/+ (-1.09) Depth: 7 00:00:00 1kN
64.Rb7+
-/+ (-0.97 !) Depth: 8 00:00:00 2kN
64.Rb7+
-/+ (-0.82 !) Depth: 8 00:00:00 2kN
64.Rb7+ Kg8 65.Rb8+ Kh7 66.Rb7+ Kh6 67.e6 Rd2+ 68.Kg3 Rxb2 69.e7[] Re2
=/+ (-0.42 !) Depth: 8 00:00:00 2kN
64.Rb7+ Kg8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Re3 68.e7 Re2+ 69.Kg3 g5 70.Rb6+ Kg7 71.Rb7 Kf6 72.hxg5+
=/+ (-0.65) Depth: 8 00:00:00 3kN
64.Rb7+ Kg8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Re3 68.e7 g5 69.Kf2 Re4 70.Kg3 Kg6 71.Rb6+ Kf7 72.hxg5 Re3+ 73.Kf4
=/+ (-0.70) Depth: 9 00:00:00 10kN
64.Rb7+ Kg8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Re3 68.e7 g5 69.Kf2 Re4 70.Kg3 Kg6 71.Rb6+ Kf7 72.hxg5 Re3+ 73.Kf4
=/+ (-0.70) Depth: 10 00:00:00 11kN
64.Rb7+ Kg8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Re3 68.e7 g5 69.Kf2 Re4 70.Kg3 Kg6 71.Rb6+ Kf7 72.hxg5 Re3+ 73.Kf4
=/+ (-0.70) Depth: 11 00:00:00 11kN
64.Rb7+ Kg8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Re3 68.e7 g5 69.Kf2 Re4 70.Kg3 Kg6 71.Rb6+ Kf7 72.hxg5 Re3+ 73.Kf4
=/+ (-0.70) Depth: 12 00:00:00 13kN
64.Rb7+ Kg8 65.Rb8+ Kg7[] 66.Rb7+ Kh6 67.e6 Re3 68.e7 g5 69.Kf2 Re4 70.Kg3 Kg6 71.Rb6+ Kf7 72.Rxb3 Rxe7 73.hxg5 Re2 74.Kf4 Rf2+ 75.Kg3 Rf1 76.Rb6 Rf3+ 77.Kh2 Kg7 78.Rh6 Rf5 79.Rxh5
-/+ (-0.99) Depth: 13 00:00:00 42kN
64.Rb7+ Kg8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Rd8 68.Rxb3 Re8 69.Rb6 Kg7 70.Kg3 Kf6 71.e7+ Kf7 72.Kf4 Rxe7 73.b4
-/+ (-0.99) Depth: 14 00:00:00 55kN
64.Rb7+ Kg8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Rd8 68.Rxb3 Re8 69.Rb6 Kg7 70.Ra6 Kf6 71.e7+ Kxe7 72.Rxg6 Kf7 73.Rh6
-/+ (-0.99) Depth: 15 00:00:00 92kN
64.Rb7+ Kg8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Rd8 68.Rxb3 Kg7 69.Rb7+ Kf6 70.e7 Re8 71.Rb6+ Kg7 72.b4 Rxe7 73.b5 Re2+ 74.Kg3
-/+ (-0.99) Depth: 16 00:00:00 135kN
64.Rb7+ Kg8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Re3 68.e7 g5 69.Kf2 Re4 70.Rxb3 Rxe7 71.Rb6+ Kg7 72.hxg5 Rf7+ 73.Kg2 Rf5 74.b4 Rxg5 75.Kg3 Re5 76.b5 Kf7 77.Kf4 Rc5 78.Rb8 Rc4+ 79.Kg3
-/+ (-1.20) Depth: 17 00:00:01 365kN, tb=9
64.Rb7+
-/+ (-1.08 !) Depth: 18 00:00:07 1063kN, tb=324
64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Re3 68.e7 g5 69.Kf2 Re4 70.Rxb3 Rxe7[] 71.Rb6+ Kg7[] 72.hxg5 Re5 73.b4 Rxg5 74.Kg3 Kf7 75.Ra6 Rd5 76.Kh4 Ke7 77.Rh6 Kd7 78.Kg3 Re5 79.Kf4
-/+ (-1.20) Depth: 18 00:00:09 1505kN, tb=385
64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Re3 68.e7 g5 69.Kf2 Re4 70.Rxb3 Rxe7[] 71.Rb6+ Kg7[] 72.hxg5 Re5 73.b4 Rxg5 74.Kg3 Kf7 75.Ra6 Rd5 76.Kh4 Ke7 77.Rh6 Kd7 78.Kg3 Re5 79.Kf4
-/+ (-1.08 !) Depth: 19 00:00:09 1520kN, tb=385
64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+ Kh8 67.Rb8+ Kh7 68.Rb7+ Kg8 69.Rb8+ Kh7 70.Rb7+ Kg8 71.Rb8+ Kh7 72.Rb7+ Kg8 73.Rb8+ Kh7 74.Rb7+ Kg8 75.Rb8+ Kh7 76.Rb7+ Kg8 77.Rb8+ Kh7 78.Rb7+ Kg8 79.Rb8+
-/+ (-1.20) Depth: 19 00:00:10 1654kN, tb=386
64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+[] Kh8 67.Rb8+ Kh7 68.Rb7+ Kg8 69.Rb8+[] Kh7 70.Rb7+ Kg8 71.Rb8+[] Kh7 72.Rb7+ Kg8 73.Rb8+[] Kh7 74.Rb7+ Kg8 75.Rb8+[] Kh7 76.Rb7+ Kg8 77.Rb8+[] Kh7 78.Rb7+ Kg8 79.Rb8+[]
-/+ (-1.20) Depth: 20 00:00:11 1857kN, tb=387
64.Rb7+ Kg8 65.Rb8+ Kh7 66.Rb7+ Kh8 67.Rb8+ Kg7 68.Rb7+[] Kh8 69.Rb8+ Kg7 70.Rb7+[] Kh8 71.Rb8+ Kg7 72.Rb7+[] Kh8 73.Rb8+ Kg7 74.Rb7+[] Kh8 75.Rb8+ Kg7 76.Rb7+[] Kh8 77.Rb8+ Kg7 78.Rb7+[] Kh8 79.Rb8+
-/+ (-1.20) Depth: 21 00:00:15 2605kN, tb=398
64.Rb7+ Kg8 65.Rb8+ Kh7 66.Rb7+ Kh8 67.Rb8+ Kg7[] 68.Rb7+ Kf8 69.Rb8+ Kg7[] 70.Rb7+ Kf8 71.Rb8+ Kg7[] 72.Rb7+ Kf8 73.Rb8+ Kg7[] 74.Rb7+ Kf8 75.Rb8+ Kg7[] 76.Rb7+ Kf8 77.Rb8+ Kg7[] 78.Rb7+ Kf8 79.Rb8+
-/+ (-1.20) Depth: 22 00:00:19 3501kN, tb=410
64.Rb7+ Kg8 65.Rb8+ Kh7 66.Rb7+ Kh8 67.Rb8+ Kg7[] 68.Rb7+ Kf8 69.Rb8+ Kg7 70.Rb7+ Kf8 71.Rb8+ Kg7 72.Rb7+ Kf8 73.Rb8+ Kg7 74.Rb7+ Kf8 75.Rb8+ Kg7 76.Rb7+ Kf8 77.Rb8+ Kg7 78.Rb7+ Kf8 79.Rb8+
-/+ (-1.08 !) Depth: 23 00:00:23 4202kN, tb=440
64.Rb7+ Kg8 65.Rb8+ Kh7 66.Rb7+ Kh8 67.Rb8+ Kg7[] 68.Rb7+ Kf8 69.Rb8+ Kg7 70.Rb7+ Kf8 71.Rb8+ Kg7 72.Rb7+ Kf8 73.Rb8+ Kg7 74.Rb7+ Kf8 75.Rb8+ Kg7 76.Rb7+ Kf8 77.Rb8+ Kg7 78.Rb7+ Kf8 79.Rb8+
-/+ (-0.93 !) Depth: 23 00:00:27 4755kN, tb=496
64.Rb7+ Kg8 65.Rb8+ Kh7 66.Rb7+ Kh8 67.Rb8+ Kg7[] 68.Rb7+ Kf8 69.Rb8+[] Kg7 70.Rb7+ Kf8 71.Rb8+[] Kg7 72.Rb7+ Kf8 73.Rb8+[] Kg7 74.Rb7+ Kf8 75.Rb8+[] Kg7 76.Rb7+ Kf8 77.Rb8+[] Kg7 78.Rb7+ Kf8 79.Rb8+[]
-/+ (-0.98) Depth: 23 00:00:51 8766kN, tb=954
64.Rb7+ Kg8 65.Rb8+ Kh7 66.Rb7+ Kh8 67.Rb8+ Kg7[] 68.Rb7+ Kh6 69.e6 Rd8 70.Rxb3 Kg7 71.Rb6 Re8 72.b4 Kf6 73.e7+ Kf7 74.b5 Rxe7[] 75.Rd6 Re6 76.Rd5 Kf6
-/+ (-0.98) Depth: 24 00:00:58 10007kN, tb=1044

(, 07.07.2010)

Just in case it was due to the undetermenistic nature of MP code here is a clip analysis on single core to eliminate "search luck" again on my slow work computer with 32bit OS

New game

[d]8/8/1R2k1p1/4P2p/6pP/1p1r4/1P4K1/8 b - - 0 1


Analysis by Deep Rybka 4 w32:

63...Kf5 64.Rf6+ Kxe5 65.Rxg6 Rd2+ 66.Kg3 Rxb2 67.Rg5+ Ke4
-+ (-2.28 !) Depth: 6 00:00:00 1kN
63...Kf5 64.Rf6+ Kxe5 65.Rxg6 Rd2+ 66.Kg3 Rxb2 67.Rg5+ Ke4
-+ (-2.43 !) Depth: 6 00:00:00 1kN
63...Kf5 64.Rf6+ Kxe5 65.Rxg6 Rd2+ 66.Kg3 Rxb2 67.Rg5+ Ke4 68.Rxh5 Rd2
-+ (-2.52) Depth: 6 00:00:00 1kN
63...Kf5 64.Rf6+ Kxe5 65.Rxg6 Rd2+ 66.Kg3 Rxb2 67.Rg5+ Ke4 68.Rxh5 Rd2 69.Rb5 b2 70.h5 Re2 71.h6
-+ (-2.64 !) Depth: 7 00:00:00 3kN
63...Kf5 64.e6 Kf6 65.Kf1 Rh3 66.e7+ Kxe7 67.Kg2 Kf7 68.Rb7+ Ke6 69.Rb6+ Kf5 70.Rb5+
-+ (-2.73) Depth: 7 00:00:00 4kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Ke4 68.Rh6
-+ (-2.79 !) Depth: 7 00:00:00 4kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rb1
-+ (-3.19 !) Depth: 7 00:00:00 5kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rb1 68.Rh8 Rg1+ 69.Kf4 b2 70.Rd8+ Kc3 71.Rc8+ Kb3 72.Rb8+ Kc2 73.Rc8+
-+ (-3.20) Depth: 7 00:00:00 6kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rb1 68.Rh8 Rg1+ 69.Kf4 b2 70.Rd8+ Kc3 71.Rc8+ Kb3 72.Rb8+ Kc2 73.Rc8+
-+ (-3.20) Depth: 8 00:00:00 7kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rh6 Kd4 67.Rd6+ Kc5 68.Rh6 Rb1 69.Rxh5+ Kd4 70.Rh8 Rg1+ 71.Kf4 b2 72.Rd8+ Kc3 73.Rc8+ Kb3 74.Rb8+ Kc2 75.Rc8+ Kd3
-+ (-3.20) Depth: 9 00:00:00 10kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rh6 Kd4 67.Rd6+ Kc5 68.Rh6 Rb1 69.Rxh5+ Kc4 70.Kg2 b2
-+ (-3.32 !) Depth: 10 00:00:00 14kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rh6 Kd4 67.Rd6+ Kc5 68.Rh6 Rb1 69.Rxh5+ Kc4 70.Kg2 b2
-+ (-3.47 !) Depth: 10 00:00:00 20kN
63...Kxe5 64.Rxg6 Rd2+[] 65.Kg3 Rxb2[] 66.Rh6 Rb1 67.Rxh5+ Kd4 68.Rh8 Rg1+ 69.Kf4 b2 70.Rd8+ Kc3 71.Rc8+ Kb3 72.Rb8+ Kc2 73.Rc8+ Kd3 74.Rd8+ Ke2 75.Re8+ Kf2
-+ (-3.55) Depth: 10 00:00:00 27kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2[] 66.Rh6 Rb1 67.Rxh5+ Kd4 68.Rh8 Rg1+ 69.Kf4 b2 70.Rd8+ Kc3 71.Rc8+ Kb3 72.Rb8+ Kc2 73.Rc8+ Kd3 74.Rd8+ Ke2 75.Re8+ Kf2
-+ (-3.55) Depth: 11 00:00:00 31kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2[] 66.Rh6 Rb1 67.Rxh5+ Kd4 68.Rh8 Rg1+ 69.Kf4 b2
-+ (-3.67 !) Depth: 12 00:00:00 53kN, tb=4
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2[] 66.Rh6 Rb1 67.Rxh5+ Kd4 68.Rh8 Rg1+ 69.Kf4 b2
-+ (-3.82 !) Depth: 12 00:00:00 76kN, tb=7
63...Kxe5 64.Kf1 Kf4[] 65.Ke2 Re3+[] 66.Kd2 Rh3 67.Rb4+ Kg3 68.Rxb3+ Kxh4 69.Rb6[] g5 70.Ke1 Rh1+ 71.Ke2 g3 72.Kf3 Rf1+ 73.Kg2 Rf2+ 74.Kg1 Kg4 75.Rb4+
-+ (-4.13) Depth: 12 00:00:01 136kN, tb=13
63...Kxe5 64.Kf1 Kf4[] 65.Ke2 Re3+[] 66.Kd2 Rh3 67.Rb4+ Kg3 68.Rxb3+ Kxh4 69.Rb6[] g5 70.Ke1 Rh1+ 71.Ke2 g3 72.Kf3 Rf1+ 73.Kg2 Rf2+ 74.Kg1 Kg4 75.Rb4+
-+ (-4.13) Depth: 13 00:00:01 160kN, tb=17
63...Kxe5 64.Rxg6[] Rd2+ 65.Kg3[] Rxb2 66.Rh6[] Rd2 67.Rxh5+[] Kd4[] 68.Rb5 b2 69.Rb8 Kc3 70.Rc8+ Kd3 71.Rd8+ Kc2 72.Rc8+ Kb3 73.Rb8+ Ka2 74.Ra8+ Kb1 75.h5 Kc1 76.Rb8 b1Q 77.Rxb1+ Kxb1 78.h6 Rd7
-+ (-3.17) Depth: 14 00:00:03 313kN, tb=197
63...Kxe5 64.Rxg6[] Rd2+ 65.Kg3[] Rxb2 66.Rh6 Rd2 67.Rxh5+[] Kd4[] 68.Rb5 b2 69.Rb8 Kc3 70.Rc8+ Kd3 71.Rd8+ Kc2 72.Rc8+ Kb3 73.Rb8+ Ka2 74.Ra8+ Kb1 75.h5 Kc1 76.Rb8 b1Q 77.Rxb1+ Kxb1 78.h6 Rd7
-+ (-3.17) Depth: 15 00:00:04 318kN, tb=198
63...Kxe5 64.Rxg6[] Rd2+ 65.Kg3[] Rxb2 66.Rh6 Rd2 67.Rxh5+[] Kd4 68.Rb5 b2 69.Rb8 Kc3 70.Rc8+ Kd3 71.Rd8+ Kc2 72.Rc8+ Kb3 73.Rb8+ Ka2 74.Ra8+ Kb1 75.h5 Kc1 76.Rb8 b1Q 77.Rxb1+ Kxb1 78.h6 Rd7
-+ (-3.17) Depth: 16 00:00:04 354kN, tb=277
63...Kxe5 64.Rxg6[] Rd2+ 65.Kg3[] Rxb2 66.Rh6 Rd2 67.Rxh5+[] Kd4 68.Rb5 b2 69.Rb8 Kc3 70.Rc8+ Kb4 71.Rb8+ Kc4 72.Rc8+ Kb3 73.Rb8+ Ka2 74.Ra8+ Kb1 75.h5 Kc1 76.Rb8 b1Q 77.Rxb1+ Kxb1 78.h6 Rd7
-+ (-3.17) Depth: 17 00:00:05 395kN, tb=357
63...Kxe5 64.Rxg6[] Rd2+ 65.Kg3[] Rxb2 66.Rh6 Rd2 67.Rxh5+[] Kd4 68.Rb5 b2 69.Rb8 Kc3 70.Rc8+ Kb4 71.Rb8+ Kc4 72.Rc8+ Kd3 73.Rb8 Kc4 74.Rc8+ Kd3 75.Rb8 Kc4 76.Rc8+ Kd3 77.Rb8 Kc4 78.Rc8+ Kd3
-+ (-3.08) Depth: 18 00:00:06 471kN, tb=491
63...Kxe5 64.Rxg6[] Rd2+ 65.Kg3[] Rxb2 66.Rh6 Rd2 67.Rxh5+[] Kd4 68.Rb5 b2 69.Rb8 Kc3 70.Rc8+ Kb3 71.Rb8+ Kc4 72.Rc8+ Kd3 73.Rb8 Kc2 74.Rxb2+ Kxb2 75.Kxg4[] Rd4+
-+ (-3.08) Depth: 19 00:00:07 603kN, tb=753
63...Kxe5 64.Rxg6[] Rd2+ 65.Kg3[] Rxb2 66.Rh6 Rd2 67.Rxh5+[] Kd4 68.Rb5 b2 69.Rb8 Kc3 70.Rc8+ Kb3 71.Rb8+ Kc4 72.Rc8+ Kb4 73.Rb8+ Kc4 74.Rc8+ Kb4 75.Rb8+ Kc4 76.Rc8+ Kb4 77.Rb8+ Kc4 78.Rc8+ Kb4
-+ (-3.08) Depth: 20 00:00:11 840kN, tb=1277
63...Kxe5 64.Rxg6[] Rd2+ 65.Kg3[] Rxb2 66.Rh6 Rd2 67.Rxh5+[] Kd4[] 68.Rb5 b2 69.Rb8 Kc3 70.Rc8+ Kd3 71.Rb8 Kc4 72.Rc8+ Kb3 73.Rb8+[] Kc4 74.Rc8+ Kb3 75.Rb8+[] Kc4 76.Rc8+ Kb3 77.Rb8+[] Kc4 78.Rc8+ Kb3
-+ (-3.08) Depth: 21 00:00:15 1123kN, tb=2135
63...Kxe5 64.Rxg6[] Rd2+ 65.Kg3[] Rxb2 66.Rh6 Rd2 67.Rxh5+[] Kd4[] 68.Rb5 b2 69.Rb8 Kc3 70.Rc8+[] Kd3 71.Rb8 Kc4 72.Rc8+ Kb3 73.Rb8+ Kc4 74.Rc8+ Kb3 75.Rb8+ Kc4 76.Rc8+ Kb3 77.Rb8+ Kc4 78.Rc8+ Kb3
-+ (-3.08) Depth: 22 00:00:22 1578kN, tb=3484
63...Kxe5 64.Rxg6[] Rd6 65.Rg7 Rd2+ 66.Kg3 Rxb2 67.Rh7 Rd2 68.Rxh5+ Kd4[] 69.Rb5 b2 70.Rb8 Kc3 71.Rc8+ Kd3 72.Rb8 Kc4 73.Rc8+ Kb3 74.Rb8+ Kc4 75.Rc8+ Kb3 76.Rb8+ Kc4 77.Rc8+ Kb3 78.Rb8+ Kc4
-+ (-3.08) Depth: 23 00:00:38 2699kN, tb=5386
63...Kxe5 64.Rxg6[] Rd6 65.Rg7 Rd2+ 66.Kg3 Rxb2 67.Rh7 Rd2 68.Rxh5+ Kd4[] 69.Rb5 b2 70.Rb8 Kc3 71.Rc8+ Kd3 72.Rb8 Kc4 73.Rc8+ Kb3 74.Rb8+ Kc4 75.Rc8+ Kb3 76.Rb8+ Kc4 77.Rc8+ Kb3 78.Rb8+ Kc4
-+ (-3.08) Depth: 24 00:00:52 3749kN, tb=6326
63...Kxe5 64.Rxg6[] Rd6 65.Rg7 Kf4 66.Rf7+ Ke4 67.Rh7 Rd5 68.Kg3 Kd3 69.Rc7 Ke2 70.Rc4 Rd3+ 71.Kg2 Rd2 72.Rc5 Rxb2 73.Rxh5 Rd2 74.Rb5 b2 75.Kg3 Kd3 76.Rb8 Kc4 77.Rc8+ Kb3 78.Rb8+ Kc4
-+ (-3.08) Depth: 25 00:01:36 7518kN, tb=11232

(, 07.07.2010)

And now same conditions but after Kf7? also single core 32bit

New game

[d]8/5k2/1R4p1/4P2p/6pP/1p1r4/1P4K1/8 w - - 0 1


Analysis by Deep Rybka 4 w32:

64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Rd2+ 68.Kg3
-/+ (-1.15 !) Depth: 6 00:00:00 1kN
64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Rd2+ 68.Kg3
-/+ (-1.00 !) Depth: 6 00:00:00 1kN
64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Rd2+ 68.Kg3
=/+ (-0.60 !) Depth: 6 00:00:00 1kN
64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Rd2+ 68.Kf1 g3 69.Rxb3 Rf2+ 70.Kg1 Re2 71.Rb6 Kg7 72.Kf1 g2+
=/+ (-0.38) Depth: 6 00:00:00 1kN
64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Rd2+ 68.Kf1 Rd8 69.Rxb3 Kg7 70.Rb6 Kf6 71.Kg2 Re8 72.e7+ Kf7 73.Kg3 Rxe7
-/+ (-0.89) Depth: 7 00:00:00 5kN
64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Rd2+ 68.Kf1 Rd8 69.Rxb3 Re8 70.Rb6 g5 71.e7+ Kg7 72.hxg5 Rxe7 73.Rh6 Rb7 74.Rxh5 Kg6 75.Rh2 Kxg5 76.Re2 Kf4 77.Kg2
-/+ (-0.86) Depth: 8 00:00:00 7kN
64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Rd2+ 68.Kf1 Rd8 69.Rxb3 Re8 70.Rb6 g5 71.e7+ Kg7 72.hxg5 Rxe7 73.Rh6 Rb7 74.Rxh5 Kg6 75.Rh2 Kxg5 76.Re2 Kf4 77.Kg2
-/+ (-0.86) Depth: 9 00:00:00 8kN
64.Rb7+ Kf8 65.Rb8+ Kg7[] 66.Rb7+ Kh6 67.e6 Rd2+ 68.Kf1 Rd8 69.Rxb3 Re8 70.Rb6 g5 71.e7+ Kg7 72.hxg5 Rxe7 73.Rh6 Rb7 74.Rxh5 Kg6 75.Rh2 Kxg5 76.Re2 Kf4 77.Kg2
-/+ (-0.86) Depth: 10 00:00:00 8kN
64.Rb7+ Kf8 65.Rb8+ Kg7 66.Rb7+ Kh6 67.e6 Rd2+ 68.Kf1 Rd8 69.Rxb3 Re8 70.Rb6 g5 71.e7+ Kg7 72.hxg5 Rxe7 73.Rh6 Rb7 74.Rxh5 Kg6 75.Rh2 Kxg5 76.Re2 Kf4 77.Kg2 Rb3 78.Rf2+ Ke4 79.Re2+
-/+ (-0.81) Depth: 11 00:00:00 15kN
64.Rb7+ Kf8 65.Rb8+[] Kg7[] 66.Rb7+[] Kh6 67.e6 Rd2+ 68.Kf1[] Rd8 69.Rxb3 Re8 70.Rb6 g5 71.e7+ Kg7 72.hxg5 Rxe7 73.Rh6 Rb7 74.Rxh5 Kg6 75.Rh2 Kxg5 76.Rc2 Rb3 77.Kf2 Kh4 78.Kg2 Re3 79.Kf2
=/+ (-0.70) Depth: 12 00:00:00 61kN
64.Rb7+ Kf8 65.Rb8+[] Kg7 66.Rb7+[] Kh6 67.e6 Rd2+ 68.Kf1[] Rd8 69.Rxb3 Re8 70.Rb6 g5 71.e7+ Kg7 72.hxg5 Rxe7 73.Rh6 Rb7 74.Rxh5 Kg6 75.Rh2 Kxg5 76.Rc2 Rb3 77.Kf2 Kh4 78.Kg2 Re3 79.Kf2
=/+ (-0.70) Depth: 13 00:00:01 66kN
64.Rb7+ Kf8[] 65.Rb8+ Kg7[] 66.Rb7+ Kh6[] 67.e6 g5 68.e7 Re3 69.Kf2 Re4 70.Kg3 Kg6 71.Rb6+ Kf7 72.Rxb3 Rxe7 73.hxg5 Re1 74.Rb6 Re3+ 75.Kf4 Rf3+ 76.Ke4 h4 77.b4 h3 78.b5 h2 79.Rh6
-/+ (-1.31) Depth: 14 00:00:03 233kN, tb=12
64.Rb7+ Kf8[] 65.Rb8+ Kg7[] 66.Rb7+ Kg8 67.Rb8+ Kh7[] 68.Rb7+ Kh6[] 69.e6 g5 70.e7 Re3 71.Kf2 Re4 72.Kg3 Kg6 73.Rb6+ Kf7[] 74.Rxb3 Rxe7 75.hxg5 Re1[] 76.Ra3 Kg6 77.b4 Rg1+ 78.Kh2 Rb1 79.Kg3
-/+ (-1.31) Depth: 15 00:00:04 329kN, tb=16
64.Rb7+ Kf8 65.Rb8+ Kg7[] 66.Rb7+ Kg8 67.Rb8+ Kh7[] 68.Rb7+ Kh6[] 69.e6 g5 70.e7 Re3 71.Kf2 Re4 72.Kg3 Kg6 73.Rb6+ Kf7[] 74.Rxb3 Rxe7 75.hxg5 Re1[] 76.Ra3 Kg6 77.b4 Rg1+ 78.Kh2 Rb1 79.Kg3
-/+ (-1.31) Depth: 16 00:00:04 332kN, tb=16
64.Rb7+ Kf8 65.Rb8+ Kg7[] 66.Rb7+ Kh8 67.Rb8+ Kh7[] 68.Rb7+ Kh6[] 69.e6 g5 70.e7 Re3 71.Kf2 Re4 72.Kg3 Kg6 73.Rb6+ Kf7 74.Rxb3 Rxe7 75.hxg5 Re1[] 76.Ra3 Kg6 77.b4 Rg1+ 78.Kh2 Rb1 79.Kg3
-/+ (-1.31) Depth: 17 00:00:05 459kN, tb=16
64.Rb7+ Kf8 65.Rb8+ Kg7[] 66.Rb7+ Kh8 67.Rb8+ Kh7[] 68.Rb7+ Kh6 69.e6 g5 70.e7 Re3 71.Kf2 Re4 72.Kg3 Kg6 73.Rb6+ Kf7 74.Rxb3 Rxe7 75.hxg5 Re1[] 76.Ra3 Kg6 77.b4 Rg1+ 78.Kh2 Rb1 79.Kg3
-/+ (-1.31) Depth: 18 00:00:07 616kN, tb=26
64.Rb7+ Kf8 65.Rb8+ Kg7[] 66.Rb7+ Kh8 67.Rb8+ Kh7[] 68.Rb7+ Kh6 69.e6 g5 70.e7 Re3 71.Kf2 Re4 72.Kg3 Kg6 73.Rb6+ Kf7 74.Rxb3 Rxe7 75.hxg5 Re1[] 76.Ra3 Kg6 77.b4 Rg1+ 78.Kh2 Rb1 79.Kg3
-/+ (-1.19 !) Depth: 19 00:00:08 657kN, tb=27
64.Rb7+ Kf8 65.Rb8+ Kg7[] 66.Rb7+ Kh8 67.Rb8+ Kh7[] 68.Rb7+ Kh6 69.e6 g5 70.e7 Re3 71.Kf2 Re4 72.Kg3 Kg6 73.Rb6+ Kf7 74.Rxb3 Rxe7 75.hxg5 Re1[] 76.Ra3 Kg6 77.b4 Rg1+ 78.Kh2 Rb1 79.Kg3
-/+ (-1.04 !) Depth: 19 00:00:09 722kN, tb=48
64.Rb7+ Kf8 65.Rb8+[] Kg7 66.Rb7+[] Kh8 67.Rb8+ Kh7[] 68.Rb7+ Kh6 69.e6 g5 70.e7 Re3 71.Kf2 Re4 72.Kg3 Re2 73.Rxb3 Rxe7 74.hxg5+ Kxg5 75.Rb5+ Kg6 76.Kh4 Rh7 77.b4 Kf6 78.Rc5 Rg7 79.Rc3
-/+ (-0.81) Depth: 19 00:00:12 915kN, tb=99
64.Rb7+ Kf8 65.Rb8+[] Kg7[] 66.Rb7+[] Kh8 67.Rb8+ Kh7[] 68.Rb7+ Kh6 69.e6 Rd2+ 70.Kf1 Rc2 71.Rxb3 Kg7 72.Re3 Rc8 73.b4 Kf6 74.b5 Ke7 75.Re5 Rb8 76.Rg5 Kf6 77.Kg2 Rb6 78.Kg3 Rxe6 79.Rc5
-/+ (-0.88) Depth: 20 00:00:21 1537kN, tb=219
64.Rb7+ Kf8 65.Rb8+[] Kg7[] 66.Rb7+[] Kh8 67.Rb8+ Kh7[] 68.Rb7+ Kh6 69.e6 Re3 70.e7 Re2+ 71.Kg3 Re4 72.Kf2 g5 73.Kg3 Re2 74.Rxb3 Rxe7 75.hxg5+ Kxg5 76.Rb5+[] Kg6[] 77.Kh4[] Rh7 78.b4 Kf6 79.Rc5
-/+ (-0.81) Depth: 21 00:00:28 1975kN, tb=260

(, 07.07.2010)

Unfortunately this looks like the "stall" bug that I have noticed in some endgames with Rybka, which also seems related to MPV analysis stalling. My next try is to eliminate EGTB's as a culprit. Here is a clip analysis without EGTB's

New game

[d]8/8/1R2k1p1/4P2p/6pP/1p1r4/1P4K1/8 b - - 0 1

Analysis by Deep Rybka 4 w32:

63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Ke4 67.Rxh5 Rb1 68.Rg5 Rg1+
-+ (-2.56 !) Depth: 6 00:00:00 1kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rc2
-+ (-2.71 !) Depth: 6 00:00:00 1kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rd2 68.Kxg4 b2 69.Rb5 Kc4 70.Rb6 Kc3
-+ (-2.63) Depth: 6 00:00:00 1kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rb1 68.Rb5 b2 69.Kf2 Rh1
-+ (-2.75 !) Depth: 7 00:00:00 2kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rb1
-+ (-2.90 !) Depth: 7 00:00:00 3kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rb1 68.Kg2 Re1 69.Rb5 Kc4
-+ (-2.96) Depth: 7 00:00:00 3kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rb1 68.Kg2 b2 69.Rb5 Kc3
-+ (-3.08 !) Depth: 8 00:00:00 6kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rb1 68.Kg2 b2 69.Rb5 Kc3
-+ (-3.23 !) Depth: 8 00:00:00 7kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rb1 68.Rh8 Rg1+ 69.Kf4 b2 70.Rd8+ Kc4 71.Rc8+ Kb4 72.Rb8+ Kc3 73.Rc8+ Kb3 74.Rb8+
-+ (-3.45) Depth: 8 00:00:00 11kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3 Rxb2 66.Rh6 Rb1 67.Rxh5+ Kd4 68.Rh8 b2 69.Rd8+ Ke5 70.Re8+ Kd6 71.Rd8+ Kc7
-+ (-3.45) Depth: 9 00:00:00 16kN
63...Kxe5 64.Kf1 Kf4 65.Ke2 Rh3 66.Kf1 Rxh4 67.Kg1 Rh3 68.Rxg6 Rg3+ 69.Kf2 h4
-+ (-3.43) Depth: 10 00:00:00 24kN
63...Kxe5 64.Kf1 Kf4 65.Ke2 Re3+ 66.Kf1 Kg3 67.Rxg6 Rf3+[] 68.Ke1 Kxh4 69.Ke2 Kg3
-+ (-3.55 !) Depth: 11 00:00:00 34kN
63...Kxe5 64.Kf1 Kf4 65.Ke2 Re3+ 66.Kf1 Kg3 67.Rxg6 Rf3+[] 68.Ke1 Kxh4 69.Ke2 Kg3 70.Rb6 Rf2+ 71.Kd3 h4 72.Kd4 Rxb2 73.Kc3
-+ (-3.70 !) Depth: 11 00:00:00 49kN
63...Kxe5 64.Kf1 Kf4 65.Ke2 Re3+ 66.Kd2 Rh3 67.Rb4+ Ke5 68.Ke1 Rxh4 69.Rb5+ Ke4 70.Rxb3 Rh1+ 71.Kf2 Rh2+
-+ (-3.70) Depth: 11 00:00:00 50kN
63...Kxe5 64.Kf1 Kf4 65.Ke2 Re3+ 66.Kd2 Rh3 67.Rb4+ Ke5 68.Ke1 Rxh4 69.Rb5+ Ke4 70.Rb4+ Kf5 71.Rb5+ Ke4 72.Rb4+ Kf5 73.Rb5+ Ke4 74.Rb4+ Kf5 75.Rb5+ Ke4 76.Rb4+ Kf5 77.Rb5+ Ke4 78.Rb4+ Kf5
-+ (-3.70) Depth: 12 00:00:00 64kN
63...Kxe5 64.Kf1 Kf4 65.Ke2 Re3+ 66.Kd2 Rf3 67.Rxg6 Kg3 68.Rh6 Kxh4 69.Ke2 Kg5 70.Rd6 h4
-+ (-3.82 !) Depth: 13 00:00:00 109kN
63...Kxe5 64.Kf1 Kf4 65.Ke2 Re3+ 66.Kd2 Rf3 67.Rxg6 Kg3 68.Rb6 Kxh4 69.Rb4 Kh3 70.Ke2 h4
-+ (-3.97 !) Depth: 13 00:00:00 156kN
63...Kxe5 64.Rxg6 Rd2+[] 65.Kg3 Rxb2 66.Rg5+ Kd4 67.Rxh5 Rb1 68.Kh2 b2 69.Rb5 Kc3
-+ (-4.10) Depth: 13 00:00:01 234kN
63...Kxe5 64.Rxg6 Rd6 65.Rg8 Rd2+[] 66.Kg3 Rxb2[] 67.Re8+ Kd4 68.Rd8+ Ke3 69.Re8+ Kd3 70.Rd8+ Ke2 71.Rh8 Rb1 72.Re8+ Kd2 73.Rd8+ Kc3 74.Rc8+ Kd3 75.Rd8+ Kc2 76.Rc8+ Kd2 77.Rd8+ Kc3 78.Rc8+ Kd3
-+ (-3.81) Depth: 14 00:00:01 282kN
63...Kxe5 64.Rxg6 Rd6 65.Rg8 Rd2+[] 66.Kg3 Rxb2[] 67.Re8+ Kd4 68.Rd8+ Ke3 69.Re8+ Kd3[] 70.Rd8+ Ke2 71.Rh8 Rb1 72.Re8+ Kd2 73.Rd8+ Kc3 74.Rc8+ Kd4 75.Rd8+ Kc4 76.Rc8+ Kb4 77.Rb8+ Kc3 78.Rc8+ Kd4
-+ (-3.93 !) Depth: 15 00:00:01 344kN
63...Kxe5 64.Rxg6 Rd2+ 65.Kg3[] Rxb2 66.Rg5+ Kd4 67.Rxh5 Rd2 68.Rb5 Kc4 69.Rb8 b2[] 70.Rc8+ Kb3 71.Rb8+ Kc2 72.h5 Rd3+ 73.Kxg4 Rb3 74.Rc8+ Rc3 75.Rb8 Rc4+ 76.Kg5 Rc5+ 77.Kg4 Kc1
-+ (-3.26) Depth: 15 00:00:02 512kN
63...Kxe5 64.Rxg6[] Rd6 65.Rg8 Rd2+ 66.Kg3[] Rxb2 67.Rg5+[] Kd4 68.Rxh5[] Rd2 69.Rb5 Kc4 70.Rb8 b2 71.Rc8+[] Kb3 72.Rb8+[] Kc2 73.Rc8+ Kd3 74.Rb8 Kc2 75.Rc8+ Kd3 76.Rb8 Kc2 77.Rc8+ Kd3 78.Rb8 Kc2
-+ (-2.83) Depth: 16 00:00:03 689kN
63...Kxe5 64.Rxg6[] Rd6 65.Rg8[] Rd2+ 66.Kg3[] Rxb2 67.Rg5+[] Kd4 68.Rxh5[] Rd2 69.Rb5 Kc4 70.Rb8 b2 71.Rc8+ Kb3 72.Rb8+[] Kc3 73.Rc8+ Kd3 74.Rb8 Kc2 75.Kxg4 b1Q 76.Rxb1[] Kxb1 77.h5 Rd7 78.h6 Kc2
-+ (-2.83) Depth: 17 00:00:04 813kN
63...Kxe5 64.Rxg6[] Rd6 65.Rg8 Rd2+ 66.Kg3 Rxb2 67.Rg5+[] Kd4 68.Rxh5[] Rd2 69.Rb5 Kc4 70.Rb8 b2 71.Rc8+ Kb3 72.Rb8+[] Kc3 73.Rc8+ Kd3 74.Rb8 Kc2 75.Kxg4 b1Q 76.Rxb1[] Kxb1 77.h5 Rd7 78.h6 Kc2
-+ (-2.83) Depth: 18 00:00:05 935kN
63...Kxe5 64.Rxg6[] Rd6 65.Rg8 Rd2+ 66.Kg3 Rxb2 67.Rg5+[] Kd4 68.Rxh5[] Rd2 69.Rb5 Kc4 70.Rb8 b2 71.Rc8+ Kb3 72.Rb8+[] Kc3 73.Rc8+ Kd3 74.Rb8 Kc2 75.Kxg4 Rd4+ 76.Kg5 Rd5+ 77.Kg6 Rd6+ 78.Kg5 Rd8
-+ (-2.83) Depth: 19 00:00:06 1148kN
63...Kxe5 64.Rxg6[] Rd6 65.Rg8 Rd2+ 66.Kg3 Rxb2 67.Rg5+[] Kd4 68.Rxh5[] Rd2 69.Rb5 Kc4 70.Rb8 b2 71.Rc8+ Kb3 72.Rb8+[] Kc3 73.Rc8+ Kd3 74.Rb8 Kc2 75.Kxg4 Rd4+ 76.Kg5 Rd5+ 77.Kg6 Rd6+ 78.Kg5 Rd8
-+ (-2.83) Depth: 20 00:00:07 1223kN
63...Kxe5 64.Rxg6[] Rd6 65.Rg8 Rd2+ 66.Kg3 Rxb2 67.Rg5+ Kd4 68.Rxh5[] Rd2 69.Rb5 Kc4 70.Rb8 b2 71.Rc8+ Kd4 72.Rd8+ Kc3 73.Rc8+ Kd3 74.Rb8 Kc2 75.Kxg4 Rd4+ 76.Kg5 Rd5+ 77.Kg6 Rd6+ 78.Kg5 Rd8
-+ (-2.83) Depth: 21 00:00:09 1599kN
63...Kxe5 64.Rxg6[] Rd6 65.Rg8 Rd2+ 66.Kg3 Rxb2 67.Rg5+ Kd4 68.Rxh5 Rd2 69.Rb5 Kc4 70.Rb8 b2 71.Rc8+ Kd4 72.Rd8+ Kc3 73.Rc8+ Kd3 74.Rb8 Kc2 75.Kxg4 Rd4+ 76.Kg5 Rd5+ 77.Kg6 Rd6+ 78.Kg5 Rd8
-+ (-2.83) Depth: 22 00:00:13 2343kN
63...Kxe5 64.Rxg6[] Rd6 65.Rg8 Rd2+ 66.Kg3 Rxb2 67.Rg5+ Kd4 68.Rxh5 Rd2 69.Rb5 Kc4 70.Rb8 b2 71.Rc8+ Kd4 72.Rd8+ Kc3 73.Rc8+ Kd3 74.Rb8 Kc4 75.Rc8+ Kd4 76.Rd8+ Kc3 77.Rc8+ Kd3 78.Rb8 Kc4
-+ (-2.83) Depth: 23 00:00:28 5911kN
63...Kxe5 64.Rxg6[] Rd4 65.Kg3 Ke4 66.Rh6 Rd5 67.Kg2 Ke3 68.Kh2 Kf2 69.Rf6+ Ke1 70.Rc6 Rd2+ 71.Kg3 Rxb2 72.Rc5 Rb1 73.Rxh5 b2 74.Kxg4 Kd2 75.Rd5+ Kc2 76.Rb5 Rg1+ 77.Kf5 b1Q 78.Rxb1 Rxb1
-+ (-2.95 !) Depth: 24 00:00:48 10334kN
63...Kxe5 64.Rxg6[] Rd4 65.Kg3 Ke4 66.Rh6 Rd5 67.Kg2 Ke3 68.Kh2 Kf2 69.Rf6+ Ke1 70.Rc6 Kd1 71.Rc7 Rd2+ 72.Kg3 Rxb2 73.Rb7 Kd2 74.Rb5 Rb1 75.Rxh5 Rg1+ 76.Kf4 b2 77.Rb5 b1Q 78.Rxb1 Rxb1
-+ (-3.10 !) Depth: 24 00:01:04 15025kN
63...Kxe5 64.Rxg6[] Rd4[] 65.Kg3 Ke4
-+ (-3.50 !) Depth: 24 00:01:31 22850kN

(, 07.07.2010)

Here is the full game

(48) Houdini 1.02 x64 4CPU - Rybka 4 x64 4CPU [C50]
Match 1 (48.1), 06.07.2010
[0.04;0.10]
Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz 4050 MHz W=31.1 plies; 11 638kN/s B=28.2 plies; 598kN/s; 4 148 119 TBAs 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d3 Bc5 0.10/22 4:31 5.Nc3 (0-0) 0.04/26 7:18 5...h6 (d6) 0.08/21 4:33 6.Be3 0.01/24 3:01 Bxe3 0.08/21 2:15 7.fxe3 0.01/22 0 d6 0.11/22 3:24 8.d4 (a3) 0.06/24 2:49 8...0-0 0.00/22 4:55 9.0-0 0.05/25 3:16 Bg4 0.00/21 4:00 10.Bb3 (Qd2) 0.01/23 5:36 10...Bxf3 0.00/20 3:23 11.Rxf3 0.02/26 5:59 Na5 0.00/21 2:05 12.Qd3 (Qe2) 0.06/25 2:32 12...c6 0.06/22 10:19 13.Raf1 0.09/25 3:43 Nxb3 0.06/21 3:13 14.axb3 0.11/25 17:50 a5 0.00/20 1:21 15.Ne2 0.13/26 10:27 Nd7 (Nh7) 0.00/19 1:49 16.Ng3 0.08/25 7:04 g6 0.00/20 1:16 17.Ne2 0.08/24 2:37 Qc7 (Qe7) 0.00/21 2:54 18.Nc3 (c4) 0.10/24 3:04 18...b5 -0.04/21 5:15 19.Qe2 0.10/24 2:20 Qd8 -0.04/18 1:34 20.Qd1 0.09/23 1:31 b4 (Qc7) -0.11/20 2:46 21.Nb1 (Ne2) 0.02/23 2:14 21...Qe7 -0.15/21 4:07 22.Nd2 0.00/24 1:41 Kg7 (d5) -0.11/20 2:42 23.c3 (R3f2) 0.01/24 2:13 23...d5 -0.18/20 4:14 24.exd5 0.00/23 1:33 cxd5 -0.17/20 45 25.c4 -0.01/24 3:17 f5 (Qe6) -0.18/19 1:33 26.cxd5 (Rg3) 0.00/24 1:36 26...e4 -0.20/20 1:21 27.Rg3 (Rh3) -0.02/25 2:05 27...Qd6 -0.23/22 3:05 28.Nc4 -0.03/26 3:27 Qxd5 -0.34/22 45 29.Qd2 -0.07/26 3:39 Ra6 -0.34/21 1:37 30.Ra1 (Rc1) -0.10/25 2:37 30...Qb5 (Rfa8) -0.52/21 8:56 31.Rc1 -0.07/25 3:11 Rc8 (Qd5) -0.39/21 4:20 32.h3 (Kf2) -0.11/23 1:52 32...Qb8 (Rac6) -0.85/21 3:23 33.Qf2 -0.48/22 1:40 Kh7 -0.85/20 50 34.Ra1 (h4) -0.52/23 1:41 34...a4 -1.13/18 1:20 35.h4 -0.53/24 59 h5 -1.23/17 22 36.Rg5 (Ra2) -0.60/23 1:19 36...Qb5 -1.33/19 1:08 37.Qf4 (Qg3) -0.63/23 1:09 37...axb3 -1.40/21 1:46 38.Rxa6 -0.56/21 0 Qxa6 -1.40/22 31 39.Ne5 -1.08/26 1:39 Nxe5 -1.47/22 3:24 40.Qxe5 -1.08/24 0 Qb7 (Rc1+) -1.59/23 7:00 41.g4 (Qe6) -0.71/27 3:03 41...fxg4 -1.67/20 55 42.Qe6 -0.71/25 0 Rc1+ -2.16/20 1:26 43.Kg2 -0.77/28 1:39 Rc2+ -2.16/20 49 44.Kg1 -1.01/29 5:07 Rc6 -2.24/21 38 45.Qe8 -1.01/27 4 Kg7 -2.24/22 3:47 46.Re5 -0.99/29 4:32 Rc7 -2.21/22 48 47.Re6 -1.00/30 7:00 Rf7 -2.33/22 32 48.Rxe4 (Kg2) -1.16/31 14:30 48...Qc7 -2.49/24 2:25 49.Qe5+ -1.16/28 1 Qxe5 -2.49/25 1:04 50.dxe5 -1.42/31 8:10 Rf3 (Rb7) -3.14/25 2:47 51.Kg2 (Rxb4) -1.59/28 1:43 51...Rh3 -3.14/25 1:53 52.Rxb4 -1.67/29 2:05 Rxe3 -3.14/26 32 53.Rb7+ -1.80/30 2:51 Kg8 (Kf8) -3.14/29 6:12 54.Rb8+ (Kf2) -1.95/28 2:35 54...Kf7 -3.41/28 4:19 55.Rb7+ -2.18/28 2:02 Ke8 -3.68/28 4:30 56.Kf2 -2.26/27 1:08 Rf3+ -3.91/28 3:45 57.Kg2 -2.38/27 1:23 Rd3 -3.91/30 6:14 58.Kf1 -2.40/27 1:18 Rh3 (Kf8) -3.91/29 5:27 59.Kg2 (Rg7) -2.39/29 1:17 59...Kd8 (Kf8) -3.91/28 3:42 60.Rb8+ (Rb6) -2.39/30 1:35 60...Ke7 (Kd7) -3.91/30 4:11 61.Rb6 -2.41/27 43 Rd3 -3.91/29 1:08 62.Rb7+ (Rxg6) -2.49/29 1:06 62...Ke6 -3.91/28 1:53 63.Rb6+ -2.49/31 1:13 Kf7 (Kd7) -3.91/28 2:21 64.Rb7+ -0.32/29 15 Kg8 (Kf8) -3.91/26 1:23 65.Rb8+ (e6) -0.38/31 41 65...Kh7 -1.57/26 2:13 66.Rb7+ -0.39/31 56 Kh6 -1.72/28 2:20 67.e6 -0.39/30 48 Rd8 -1.58/28 1:57 68.Rxb3 -0.39/32 44 Re8 (Kg7) -1.39/28 2:37 69.Rb6 -0.44/31 1:21 Kg7 -1.39/30 1:08 70.b4 -0.44/32 39 Kf6 -1.39/29 38 71.Ra6 -0.44/33 48 Rxe6 -1.39/30 1:35 72.b5 -0.44/33 41 Kf5 -1.39/30 1:04 73.b6 -0.44/33 52 Re2+ -2.06/29 1:21 74.Kg3 -0.44/32 2 Re3+ -2.38/29 12 75.Kg2 -0.92/34 3:15 Rb3 -2.38/29 21 76.Ra5+ -0.99/33 2:00 Ke4 -2.38/28 23 77.Ra4+ -0.99/33 1:33 Kd5 -2.38/29 18 78.Ra5+ -0.99/33 32 Kc4 -2.38/29 21 79.Ra6 (Ra4+) -0.99/33 41 79...Kb5 -2.38/27 39 80.Ra8 (Ra7) -0.99/33 1:28 80...Kc5 -2.38/27 22 81.Rc8+ -0.99/32 2:41 Kd4 -2.38/27 21 82.Rb8 -0.99/32 1:40 Kd5 -2.38/27 10 83.Kh2 (b7) -0.99/33 30 83...Kc6 (Rh3+) -2.38/30 1:29 84.Rg8 -0.99/36 31 Rh3+ -2.38/30 8 85.Kg2 (Kg1) -0.99/40 30 85...Kxb6 -2.38/32 14 86.Rxg6+ -0.99/40 27 Kb7 (Kc7) -2.38/35 39 87.Rg7+ (Rd6) -0.99/40 26 87...Kc8 (Kc6) -2.38/36 1:11 88.Re7 (Rg5) -0.99/40 27 88...Rxh4 -2.38/38 1:14 89.Re3 -0.99/40 26 Kd8 (Kc7) -2.38/38 1:10 90.Ra3 (Rc3) -0.99/41 26 90...Kd7 (Ke7) -2.38/39 2:31 91.Re3 (Ra7+) -0.99/41 26 91...Kd6 -2.38/38 1:04 92.Kg1 (Rg3) -0.99/42 32 92...Kd5 (Kc7) -2.38/40 1:31 93.Kg2 -0.99/44 39 Kc5 (Kd4) -2.38/38 45 94.Ra3 (Rg3) -0.99/41 34 94...Kb4 (Kd6) -2.38/38 1:12 95.Rg3 -0.99/42 27 Kc4 (Ka4) -2.38/39 30 96.Ra3 -0.99/44 27 Kd4 -2.38/38 30 97.Rg3 (Rb3) -0.99/43 35 97...Ke5 (Ke4) -2.38/41 1:32 98.Rb3 (Re3+) -0.99/44 28 98...Ke6 (Kf5) -2.38/38 1:32 99.Rd3 (Kg1) -0.99/41 28 99...Kf6 (Ke7) -2.38/37 42 100.Ra3 (Rd6+) -0.99/43 30 100...Kg6 (Kg5) -2.38/38 55 101.Ra6+ (Rd3) -0.99/43 34 101...Kf7 (Kg7) -2.38/38 42 102.Ra3 (Ra7+) -0.99/42 39 102...Kg7 -2.38/38 1:04 103.Ra7+ -0.99/41 26 Kh6 (Kg8) -2.38/39 52 104.Ra3 -0.99/42 29 Kg5 -2.38/38 11 105.Rg3 (Kg1) -0.99/43 32 105...Kg6 (Kf5) -2.38/37 34 106.Ra3 -0.99/41 25 Kf6 (Kh7) -2.38/37 41 107.Rb3 -0.99/42 25 Kf5 (Kg7) -2.38/36 5 108.Rd3 (Rg3) -0.99/43 28 108...Kf4 0.00/42 34 109.Ra3 -0.99/42 36 Rh3 (Ke4) 0.00/44 39 110.Rxh3 0.00/50 1:00 gxh3+ 0.00/59 0 111.Kxh3 0.00/34 0 Kg5 0.00/59 0 112.Kg3 (Kg2) 0.00/1 0 112...h4+ 0.00/59 0 113.Kh3 0.00/1 0 1/2-1/2

[pacifist]

Nice variations . I don't have enough knowledge on chess programming or even testing so I let other people comment on that part . Yes, after Rb6 + Kxe5 was the winning move provided black doesn't go after the b2 pawn too soon as then it is a dead draw too. The black king must have the possibility to go to f4 when white captures the h5 pawn. The pawn b2 will fall soon enough . Stockfish 1.8 easily finds the moves without TB so I hope the fixes for R4 will come soon as I think R4 still deserves 1rst place, specially in helping analyse .

[IGarcia]

Thank you Martin for hosting this games. Some where very interesting games. Looking forward for next match Stockfish 1.8 Vs Rybka 4

Im currently doing a small gaunlet match SF-1.8 vs ( Houdini 1.02 - Fire 1.31 - Deep_Shredder 12 ) I will post in a new topic this games and more info.

I confident with SF-1.8 at those long time controls an you monster computer.

Ignacio.