Author: Dieter Buerssner
Date: 11:05:47 03/10/01
Go up one level in this thread
On March 10, 2001 at 03:34:19, Uri Blass wrote:
>>> 8/8/7P/5kP1/5P2/r7/5K2/8 b - - 0 114
>It seems that the problem is that Crafty does not look at the tablebases in the
>last ply.
I tried this position with 2 different versions of Yace. First: with TB-probing
even in qsearch:
AMD K6-2 475, 15 M hash 2 M EGTB cache. I have more memory available, but it
seems, that in this sort of position with many TB-hits, it is better to give
more memory to the OS. The OS will then cache the TBs. If I understand Eugene
Nalimovs code correctly, the built in cache will cache decompressed information,
while the OS will cache the compressed information of the TBs. So, with the same
amount of memory, the OS can cache more information, but of course, there is
also more overhead in processing. Nevertheless, I get significantly better
nodes/s, although of course much worse, than with less TB hits. I have KRKPP
installed.
1032720 22.224 0.83 11t 1...Rh3 2.Kg2 Rc3 3.Kf2 Kg6 4.Ke2 Kh7 5.Kf2 Rh3
6.Ke2 Rg3 {260}
1590348 29.630 0.83 11. 1...Rh3 2.Kg2 Rc3 3.Kf2 Kg6 4.Ke2 Kh7 5.Kf2 Rh3
6.Ke2 Rg3 {260}
1877452 32.052 0.83 12t 1...Rh3 2.Kg2 Rd3 3.Kf2 Kg6 4.Kg2 Kh7 5.Kf2 Rc3
6.Kg2 Rc1 7.Kh2 {260}
2923584 43.408 0.83 12. 1...Rh3 2.Kg2 Rd3 3.Kf2 Kg6 4.Kg2 Kh7 5.Kf2 Rc3
6.Kg2 Rc1 7.Kh2 {260}
3174508 45.461 0.84 13t 1...Rh3 2.Kg2 Rd3 3.Kf2 Kg6 4.Kg2 Kh7 5.Kf2 Rc3
6.Kg2 Rc1 7.Kf3 Rg1 {260}
4435337 58.822 0.84 13. 1...Rh3 2.Kg2 Rd3 3.Kf2 Kg6 4.Kg2 Kh7 5.Kf2 Rc3
6.Kg2 Rc1 7.Kf3 Rg1 {260}
5623578 1:06.3 0.81 14t 1...Rh3 2.Kg2 Rd3 3.Kf2 Kg6 4.Kg2 Kh7 5.Kf2 Rc3
6.Kg2 Rb3 7.Kf2 Rh3 8.Kg2 Re3H 9.Kf2H Rh3H
10.Kg2H Re3H 11.Kf2H Rh3HR {260}
8738003 1:34.9 0.81 14. 1...Rh3 2.Kg2 Rd3 3.Kf2 Kg6 4.Kg2 Kh7 5.Kf2 Rc3
6.Kg2 Rb3 7.Kf2 Rh3 8.Kg2 Re3 9.Kf2 Rh3 10.Kg2
Re3 11.Kf2 Rh3 {260}
9291117 1:40.5 0.83 15t 1...Rh3 2.Kg2 Rd3 3.Kf2 Kg6 4.Kg2 Kh7 5.Kf2 Rc3
6.Kg2 Rb3 7.Kf2 Rh3 8.Ke2 Rg3 {260}
12261491 2:13.6 0.83 15. 1...Rh3 2.Kg2 Rd3 3.Kf2 Kg6 4.Kg2 Kh7 5.Kf2 Rc3
6.Kg2 Rb3 7.Kf2 Rh3 8.Ke2 Rg3 {260}
13120472 2:21.3 0.83 16t 1...Rh3 2.Kg2 Rd3 3.Kf2 Kg6 4.Kg2 Kh7 5.Kf2 Rc3
6.Kg2 Rb3 7.Kf2 Rh3 8.Ke2 Rg3 9.Kd2 {260}
17999504 3:21.0 0.83 16. 1...Rh3 2.Kg2 Rd3 3.Kf2 Kg6 4.Kg2 Kh7 5.Kf2 Rc3
6.Kg2 Rb3 7.Kf2 Rh3 8.Ke2 Rg3 9.Kd2 {260}
19336306 3:33.1 0.84 17t 1...Rh3 2.Kg2 Rd3 3.Kf2 Kg6 4.Kg2 Kh7 5.Kf2 Rc3
6.Kg2 Rb3 7.Kf2 Rh3 8.Kg2 Re3 9.Kf2 Re6 {260}
26643365 5:06.0 0.84 17. 1...Rh3 2.Kg2 Rd3 3.Kf2 Kg6 4.Kg2 Kh7 5.Kf2 Rc3
6.Kg2 Rb3 7.Kf2 Rh3 8.Kg2 Re3 9.Kf2 Re6 {260}
34443607 6:16.5 0.83 18t 1...Rh3 2.Kg2 Rd3 3.Kf2 Kg6 4.Kg2 Kh7 5.Kf2 Rc3
6.Kg2 Rb3 7.Kf2 Rb1 8.Kg2 Ra1 9.Kf2 Rh1 10.Ke2
{260}
34574790 6:18.6 0.84 18t+ 1...Ra4 2.Kg3 Rd4 3.Kh3 Kg6 4.Kg3 Kh7 5.Kf3 Ra4
6.Kg3 Ra1 7.Kf2 Ra3 8.Ke2 Rh3 9.Kf2 Rd3H
10.Kg2H Re3H 11.Kf2H Ra3H 12.Ke2H Rh3H 13.Kf2H
Rd3H 14.Kg2H Re3H 15.Kf2H Ra3HR {260}
37597716 6:52.4 0.83 18t- 1...Ra4 2.Kg3 Rd4 3.Kh3 Kg6 4.Kg3 Kh7 5.Kf3 Ra4
6.Kg3 Ra1 7.Kf2 Ra3 8.Ke2 Rh3 9.Kf2 Rh1 10.Kg2
Rd1H 11.Kf2H Rh1H 12.Ke2H Kg6H 13.Kf2H Kf5H
14.Kg2H Rh5H 15.Kg3H Kg6H 16.Kf3H Kf7H 17.Kf2H
Rh1H 18.Kg2H Rh4H 19.Kg3H Rh5H 20.Kf3H Rh1H
21.Kf2H Rh5H 22.Kg2H Kg8H 23.Kg3H {HT} {260}
37597716 6:52.4 0.83 18t 1...Rh3 2.Kg2 Rd3 3.Kf2 Kg6 4.Kg2 Kh7 5.Kf2 Rc3
6.Kg2 Rb3 7.Kf2 Rb1 8.Kg2 Ra1 9.Kf2 Rh1 10.Ke2
{260}
56666962 10:27.6 0.83 18. 1...Rh3 2.Kg2 Rd3 3.Kf2 Kg6 4.Kg2 Kh7 5.Kf2 Rc3
6.Kg2 Rb3 7.Kf2 Rb1 8.Kg2 Ra1 9.Kf2 Rh1 10.Ke2
{260}
A position, that was recently posted in a German forum same conditions:
[D] 6R1/8/7k/5p2/6p1/4K2p/8/8 w - -
Note, that here the search goes a bit crazy, probably an artifact, of allowing
nullmoves for the side with the R. While I have some Zugzwang saftey guards, the
work only at reduced depth, and so, you get search window dependant cutoffs.
6527724 1:01.7 0.82 12. 1.Kf2 Kh5 2.Kg3 Kh6 3.Kf4 Kh7 4.Rb8 Kg7 5.Rb7+
Kf6 6.Rb6+ Kf7 7.Kg3 Kg7 8.Kh2 Kf7 9.Rb3 Ke6
10.Kg3 Kf6 11.Rb1 Ke5 12.Rb5+ Kf6 13.Kf4 Kg6
14.Rb7 Kf6 15.Rb6+ Kf7 16.Kg3 Kg7 17.Kh2 Kf7
18.Rb3 Ke6 19.Kg3 Kf6 20.Rb1 Ke5 21.Rb5+ Kf6
22.Kf4 Kg6 23.Rb7 Kf6 {260}
6620269 1:03.1 Mat32 13++ 1.Kf2 Kh5 2.Rh8+ Kg5 3.Kg3 Kf6 4.Rg8 Ke5 5.Rg6H
Kd5H 6.Rh6H Ke4H 7.Rf6H Ke5H 8.Rb6H Kd5H
9.Rb5+H Ke4H 10.Ra5H h2H 11.Kxh2H {EGTB}
11...f4! 12.Rg5 Kf3! 13.Rg8! g3+ 14.Kg1! g2
15.Rxg2! Ke3! 16.Rg7 f3 17.Re7+ Kd3 18.Kf2! Kd4
19.Rd7+ Ke4 20.Rd8! Ke5 21.Kxf3! Ke6! 22.Kf4!
Ke7! 23.Rd5 Ke6! 24.Rd4 Kf6 25.Re4! Kg6!
26.Re6+! Kg7 27.Kg5! Kf7! 28.Re5 Kg7! 29.Rf5!
Kh7 30.Kf6! Kh8 31.Kf7! Kh7 32.Rh5#! {500}
6803937 1:05.3 0.84 13t 1.Kf2 Kh5 2.Kg3 Kh6 3.Rb8H Kg7H 4.Rb6H Kf7H
5.Kh2H Kg7H 6.Kg3H Kf7H 7.Kh2H Kg7H 8.Kg3HR
{260}
8591770 1:20.2 Mat38 13t+ 1.Ke2 Kh5 2.Kf2 Kh4 3.Rf8 f4H 4.Rh8+H Kg5H
5.Kg1H Kg6H 6.Rg8+H Kh5H 7.Rf8H f3H 8.Rh8+H
Kg5H 9.Rg8+H Kf5H 10.Rg7H Kf4H {HT} {260}
8816697 1:22.0 0.84 13t- 1.Ke2 Kh5 2.Kf2 f4 3.Rh8+ Kg5 4.Kg1 Kf5 5.Rc8
Ke4 6.Kf2 h2 7.Kg2 g3 8.Kh1 f3H 9.Rc7H f2H
10.Rc4+H Ke5H 11.Kg2H f1=Q+H 12.Kxg3H {-581}
8816697 1:22.0 0.84 13t 1.Kf2 Kh5 2.Kg3 Kh6 3.Rb8 Kg7 4.Rb6 Kf7 5.Kh2
Kg7 6.Kg3 Kf7 7.Kh2 Kg7 8.Kg3 {260}
9784651 1:29.7 0.84 13. 1.Kf2 Kh5 2.Kg3 Kh6 3.Rb8 Kg7 4.Rb6 Kf7 5.Kh2
Kg7 6.Kg3 Kf7 7.Kh2 Kg7 8.Kg3 {260}
9992358 1:31.3 Mat32 14++ 1.Kf2 Kh5 2.Rh8+ Kg5 3.Kg3 Kf6 4.Rg8 Ke5 5.Rg6
Kd4 6.Rh6 Ke4H 7.Rf6H Ke5H {HT} {260}
10833849 1:39.4 Mat29 14t 1.Kf2 Kh5 2.Rh8+ Kg5 3.Kg3 Kf6 4.Rg8 Ke5 5.Rf8
Ke4 6.Re8+ Kd4 7.Re7 Kd3 8.Re5H h2H 9.Kxh2H
{EGTB} 9...f4! 10.Rg5 g3+ 11.Kg2! Ke3 12.Rg8
f3+ 13.Kxg3! f2! 14.Rf8 f1=Q 15.Rxf1! Ke4!
16.Rg1 Ke5 17.Rd1! Ke4! 18.Kg4! Ke5 19.Kf3! Kf5
20.Re1! Kg5! 21.Re5+ Kg6 22.Kg4! Kf6! 23.Re4
Kg6 24.Rf4! Kh6 25.Kf5! Kg7! 26.Kg5! Kh7
27.Kf6! Kh8 28.Kf7! Kh7 29.Rh4#! {500}
[...]
24799574 3:46.3 Mat27 15. 1.Kf2 Kh5 2.Rh8+ Kg5 3.Kg3 Kf6 4.Rg8 Ke5 5.Rf8
Ke4 6.Re8+ Kd4 7.Kf4 Kd3 8.Rf8 h2 9.Rh8 g3
10.Kxg3 {EGTB} {Not all positions found in TB}
{340}
Again the probably drawn position, with "normal" TB probing:
The same behaviour, that Dann dexcribed: Yace wants to take the f4 pawn as the
last thing. Unfortunately, many PV moves are from the hash, and are not reliable
because of this:
4969795 32.319 1.32 13++ 1...Ra8 2.Kg3 Kg6 3.Kf3 Rd8 4.Ke4 Rg8 5.Ke5
Re8+ 6.Kd5 Kf5 7.Kc6 Rh8 8.Kd6H {HT} {260}
5480604 35.409 1.53 13t 1...Ra8 2.Kg3 Kg6 3.Kf3 Rd8 4.Ke4 Rd1 5.Ke5
Re1+ 6.Kd5 Kf5 7.Kd6 Rd1+ 8.Ke7 Kxf4 {340}
7755736 47.189 1.53 13. 1...Ra8 2.Kg3 Kg6 3.Kf3 Rd8 4.Ke4 Rd1 5.Ke5
Re1+ 6.Kd5 Kf5 7.Kd6 Rd1+ 8.Ke7 Kxf4 {340}
8933434 55.368 1.63 14t 1...Ra8 2.Kg3 Kg6 3.Kf3 Ra3+ 4.Kf2 Kh5 5.Kg2
Rc3 6.Kh2 Kg4 7.Kg1 Kg3 8.Kf1 Rf3+ 9.Ke2 Kxf4
{340}
9040549 56.475 1.64 14t+ 1...Ra6 2.Kg2 Kg6 3.Kg3 Kh5 4.Kf3 Rb6 5.Kg3
Rb3+ 6.Kg2 Kg4H 7.h7H Rg3+H 8.Kf2H Rh3H 9.g6H
Rf3+H 10.Kg2H Rb3H 11.h8=QH Kf5H {HT}
9332101 58.158 1.63 14t- 1...Ra6 2.Kg2 Kg6 3.Kg3 Kh5 4.Kf3 Rb6 5.Kg3
Rb3+ 6.Kg2 Kg4 7.h7 Rg3+H 8.Kf2H Rh3H 9.g6H
Rf3+H 10.Kg2H Rb3H 11.h8=QH Kf5H {HT}
9332101 58.158 1.63 14t 1...Ra8 2.Kg3 Kg6 3.Kf3 Ra3+ 4.Kf2 Kh5 5.Kg2
Rc3 6.Kh2 Kg4 7.Kg1 Kg3 8.Kf1 Rf3+ 9.Ke2 Kxf4
{340}
9524066 59.403 1.64 14t+ 1...Ra2+ 2.Kg3 Kg6 3.Kf3 Rh2 4.Kg3 Rh1 5.Kg2
Rd1 6.Kg3 Rg1+H 7.Kf3H {HT}
11354980 1:08.7 1.75 14t 1...Ra2+ 2.Kg3 Rd2 3.Kh3 Rd3+ 4.Kg2 Kg6 5.Kf2
Kh5 6.Kg2 Rc3 7.Kh2 Kg4 8.Kg1 Rh3 9.Kg2 Rh5H
10.Kg1H Kxf4H {340}
11769424 1:11.1 1.76 14t+ 1...Rh3 2.Kg2 Rc3 3.Kf2 Kg6 4.Kg2 Kh5 5.h7 Rc2+
6.Kf3 Rc8 7.Ke4 Kg6 8.f5+ Kxh7 9.Ke5 Kg7 {340}
11774110 1:11.2 1.75 14t- 1...Rh3 2.Kg2 Rc3 3.Kf2 Kg6 4.Kg2 Kh5 5.Kf2 Kh4
6.Kg2 Rc5 7.h7 Rf5 8.h8=Q+ Kg4 {-661}
11774110 1:11.2 1.75 14t 1...Ra2+ 2.Kg3 Rd2 3.Kh3 Rd3+ 4.Kg2 Kg6 5.Kf2
Kh5 6.Kg2 Rc3 7.Kh2 Kg4 8.Kg1 Rh3 9.Kg2 Rh5
10.Kg1 Kxf4 {340}
13875253 1:24.5 1.75 14. 1...Ra2+ 2.Kg3 Rd2 3.Kh3 Rd3+ 4.Kg2 Kg6 5.Kf2
Kh5 6.Kg2 Rc3 7.Kh2 Kg4 8.Kg1 Rh3 9.Kg2 Rh5
10.Kg1 Kxf4 {340}
17985430 1:43.4 1.63 15t 1...Ra2+ 2.Kg3 Rd2 3.Kh3 Rd3+ 4.Kg2 Kg6 5.Kf2
Kh5 6.Kg2 Rd4 7.Kg3 Ra4 8.Kf3 Kg6 9.Kg3 Ra8
10.Kf3H Ra3+H 11.Ke2H Rf3H {260}
23184677 2:11.1 1.63 15. 1...Ra2+ 2.Kg3 Rd2 3.Kh3 Rd3+ 4.Kg2 Kg6 5.Kf2
Kh5 6.Kg2 Rd4 7.Kg3 Ra4 8.Kf3 Kg6 9.Kg3 Ra8
10.Kf3 Ra3+ 11.Ke2 Rf3 {260}
30639101 2:47.1 1.61 16t 1...Ra2+ 2.Kg3 Rd2 3.Kh3 Rd3+ 4.Kg2 Kg6 5.Kf2
Rh3 6.Kg2 Rb3 7.Kf2 Rb2+ 8.Kg3 Kf5 9.Kf3 Rb4
10.Kg3 Re4 {260}
41239526 3:44.9 1.61 16. 1...Ra2+ 2.Kg3 Rd2 3.Kh3 Rd3+ 4.Kg2 Kg6 5.Kf2
Rh3 6.Kg2 Rb3 7.Kf2 Rb2+ 8.Kg3 Kf5 9.Kf3 Rb4
10.Kg3 Re4 {260}
53075890 4:40.3 1.60 17t 1...Ra2+ 2.Kg3 Rd2 3.Kh3 Rd3+ 4.Kg2 Kg6 5.Kf2
Rh3 6.Kg2 Re3 7.Kf2 Re4 8.Kg3 Kf5 9.Kh3 Re3+
10.Kg2 Rc3 11.Kg1 Kxf4 {HT} {340}
And the position displayed above:
2253812 12.553 1.66 11t 1.Kf4 Kh7 2.Re8 Kg7 3.Re7+ Kg6 4.Re6+ Kg7 5.Re8
Kh7 6.Rb8 Kg7 7.Rd8 Kh7 8.Rd6H Kg7H 9.Kg3H Kf7H
10.Rd8H Kg7H 11.Kf4H Kh7H 12.Rd6H Kg7H 13.Kg3H
Kf7H 14.Rd8H Kg7H 15.Kf4HR {260}
2737417 15.072 1.71 11t+ 1.Kf2 Kh5 2.Kg3 Kh6 3.Rh8+ Kg7 4.Rh4 Kf7 5.Kf4
Ke8 6.Kxf5 Ke7 {340}
2964876 16.302 1.67 11t 1.Kf2 Kh5 2.Kg3 Kh6 3.Rh8+ Kg7 4.Rh4 Kf7 5.Kf4
Ke6 6.Rh6+ Kf7 7.Kxf5 {340}
5064110 26.608 1.67 11. 1.Kf2 Kh5 2.Kg3 Kh6 3.Rh8+ Kg7 4.Rh4 Kf7 5.Kf4
Ke6 6.Rh6+ Kf7 7.Kxf5 {340}
5590061 29.623 1.81 12t 1.Kf2 Kh5 2.Rh8+ Kg5 3.Kg3 Kf6 4.Kf4 Kg7 5.Rh5
Kg6 6.Rh4 Kf6 7.Rh7 Kg6H 8.Rh8H Kg7H 9.Rh5H
Kg6H 10.Rh4H Kf6H 11.Rh7H Kg6H 12.Rh8H Kg7HR
{260}
9840279 51.967 1.81 12. 1.Kf2 Kh5 2.Rh8+ Kg5 3.Kg3 Kf6 4.Kf4 Kg7 5.Rh5
Kg6 6.Rh4 Kf6 7.Rh7 Kg6 8.Rh8 Kg7 9.Rh5 Kg6
10.Rh4 Kf6 11.Rh7 Kg6 12.Rh8 Kg7 {260}
10231167 54.209 1.81 13t 1.Kf2 Kh5 2.Rh8+ Kg5 3.Kg3 Kf6 4.Kf4 Kg7 5.Rh5
Kg6 6.Rh4 Kf6 7.Rh7 Kg6 8.Rh8H Kg7H 9.Rh5H Kg6H
10.Rh4H Kf6H 11.Rh7H Kg6H 12.Rh8H Kg7HR {260}
17235823 1:28.9 1.81 13. 1.Kf2 Kh5 2.Rh8+ Kg5 3.Kg3 Kf6 4.Kf4 Kg7 5.Rh5
Kg6 6.Rh4 Kf6 7.Rh7 Kg6 8.Rh8 Kg7 9.Rh5 Kg6
10.Rh4 Kf6 11.Rh7 Kg6 12.Rh8 Kg7 {260}
18210237 1:34.7 1.81 14t 1.Kf2 Kh5 2.Rh8+ Kg5 3.Kg3 Kf6 4.Kf4 Kg7 5.Rh5
Kg6 6.Rh4 Kf6 7.Rh7 Kg6 8.Rh8H Kg7H 9.Rh5H Kg6H
10.Rh4H Kf6H {260}
27994071 2:25.9 1.81 14. 1.Kf2 Kh5 2.Rh8+ Kg5 3.Kg3 Kf6 4.Kf4 Kg7 5.Rh5
Kg6 6.Rh4 Kf6 7.Rh7 Kg6 8.Rh8 Kg7 9.Rh5 Kg6
10.Rh4 Kf6 {260}
29491213 2:34.1 1.81 15t 1.Kf2 Kh5 2.Rh8+ Kg5 3.Kg3 Kg6 4.Rg8+ Kh6 5.Kf4
Kh7 6.Re8 Kg7 7.Re6 Kf7 8.Rh6 Kg7 9.Rh5 Kg6H
10.Rh4H Kf6H 11.Rh7H Kg6H 12.Rh8H Kg7H 13.Rh5H
Kg6H 14.Rh4H Kf6H 15.Rh7H Kg6H 16.Rh8H Kg7H
17.Rh5HR {260}
47143947 3:59.7 1.81 15. 1.Kf2 Kh5 2.Rh8+ Kg5 3.Kg3 Kg6 4.Rg8+ Kh6 5.Kf4
Kh7 6.Re8 Kg7 7.Re6 Kf7 8.Rh6 Kg7 9.Rh5 Kg6
10.Rh4 Kf6 11.Rh7 Kg6 12.Rh8 Kg7 13.Rh5 Kg6
14.Rh4 Kf6 15.Rh7 Kg6 16.Rh8 Kg7 17.Rh5 {260}
53668757 4:35.3 2.05 16t 1.Kf2 Kh5 2.Rh8+ Kg5 3.Kg3 Kg6 4.Kf4 Kg7 5.Rh5
Kg6 6.Rh4 Kf6 7.Rh6+ Kg7 8.Kg5 f4 9.Rh4 f3
10.Rxg4 h2H 11.Rf4H {HT} {340}
To summarize: In these two cases, the aggressive probing of the TBs does seem to
help, even when Nodes/s goes much down. Because I only have a very limited set
of 5-men TBs installed, it is difficult to generalize.
Another data point, you can find under "Testposition - pawn ending"
Regards,
Dieter
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