I was analyzing a position earlier with a couple of UCI engines. Then I though I'd install a couple of Winboard engines that I like, namely Crafty 23.1 and Scorpio 2.4 (both run through Wb2Uci).
However, after some minutes into the search, the n/s started to drop significantly.
First Crafty, as you can see it starts at about 18kn/s at depth 15.
Then at the last line it gives on depth 20 it's at 19kn/s+ until it drops significantly at depth 21, with 11kn/s. Then it's down to just above 7kn/s at depth 23 at around 5 minutes.
Same phenomena with Scorpio. At about depth 22 it drops significantly and at 5 minutes it's reduced the speed by over 50%.
Does the hash table fill up and doesn't get written to any more or what is happening? Both hash-sizes are verified in the task manager as correct together with 100% cpu utilization.
Any explanation/solution for this?
Code: Select all
8/p1p5/Pp1p2nk/1P1Bq1r1/2P1Pprp/1Q6/5RPP/3R3K b - -
Engine: Crafty 23.1 JA 64-bit 4CPU (1024 MB)
by Robert Hyatt
15.00 0:01 +0.15 1...Qe8 2.c5 bxc5 3.Be6 c4 4.Qxc4 Rc5
5.Qa2 Rgg5 6.Bf5 Rxb5 7.Bxg6 Rxg6
8.Rxf4 Qe7 (33.851.273) 18199
15.00 0:02 +0.15 1...Qe8 2.c5 bxc5 3.Be6 c4 4.Qxc4 Rc5
5.Qa2 Rgg5 6.Bf5 Rxb5 7.Bxg6 Rxg6
8.Rxf4 Qe7 (41.404.224) 18401
16.00 0:02 +0.46 1...Qe8 2.c5 bxc5 3.Be6 c4 4.Qxc4 Rc5
5.Qa2 Rgg5 6.Bf5 Rxb5 7.Bxg6 Qxg6
8.Rxf4 h3 9.gxh3 (46.463.322) 18511
16.00 0:10 +0.46 1...Qe8 2.c5 bxc5 3.Be6 c4 4.Qxc4 Rc5
5.Qa2 Rgg5 6.Bf5 Rxb5 7.Bxg6 Qxg6
8.Rxf4 h3 9.gxh3 (199.262.243) 19233
17.00 0:11 +0.42 1...Qe8 2.c5 bxc5 3.Be6 c4 4.Bxc4 Rc5
5.Rd4 Rgg5 6.Rf1 Qe5 7.Rfd1 Qf6
8.Qh3 Qe5 9.Qc8 Ne7 (218.727.739) 19237
17.00 0:20 +0.40 1...Kg7 2.Bb7 Qe6 3.Rdf1 Kh6 4.Bd5 Qe5
5.Qb2 Qe7 6.Qd4 Re5 7.Rf3 Qg5 8.Qd2 (401.279.196) 19282
17.00 0:22 +0.40 1...Kg7 2.Bb7 Qe6 3.Rdf1 Kh6 4.Bd5 Qe5
5.Qb2 Qe7 6.Qd4 Re5 7.Rf3 Qg5 8.Qd2 (434.973.754) 19212
18.00 0:24 +0.40 1...Kg7 2.Bb7 Qe6 3.Rdf1 Kh6 4.Bd5 Qe5
5.Qb2 Qe7 6.Qd4 Re5 7.Rf3 Qg5 8.Qd2 (470.421.163) 19271
18.00 0:26 +0.40 1...Kg7 2.Bb7 Qe6 3.Rdf1 Kh6 4.Bd5 Qe5
5.Qb2 Qe7 6.Qd4 Re5 7.Rf3 Qg5 8.Qd2 (508.084.956) 19304
19.00 0:29 +0.40 1...Kg7 2.Bb7 Qe6 3.Rdf1 Kh6 4.Bd5 Qe5
5.Qb2 Qe7 6.Qd4 Re5 7.Rf3 Qg5 8.Qd2 (571.674.582) 19378
19.00 0:34 +0.40 1...Kg7 2.Bb7 Qe6 3.Rdf1 Kh6 4.Bd5 Qe5
5.Qb2 Qe7 6.Qd4 Re5 7.Rf3 Qg5 8.Qd2 (662.265.871) 19404
20.00 0:49 +0.46 1...Kg7 2.Bb7 Qe6 3.Rdf1 Kh6 4.Bd5 Qe5
5.Qb2 Qe7 6.h3 Rg3 7.Rxf4 Nxf4
8.Qh8+ Qh7 9.Qf8+ Qg7 10.Qxf4 Rxg2
11.Qxh4+ Rh5 12.Rf6+ Rg6 13.Qf4+ Rhg5
14.Qh4+ Rh5 (954.224.266) 19328
20.00 1:44 +0.46 1...Kg7 2.Bb7 Qe6 3.Rdf1 Kh6 4.Bd5 Qe5
5.Qb2 Qe7 6.h3 Rg3 7.Rxf4 Nxf4
8.Qh8+ Qh7 9.Qf8+ Qg7 10.Qxf4 Rxg2
11.Qxh4+ Rh5 12.Rf6+ Rg6 13.Qf4+ Rhg5
14.Qh4+ Rh5 (2.004.954.557) 19127
21.00 3:06 +0.42 1...Kg7 2.Bb7 Qe6 3.Rdf1 Kh6 4.Bd5 Qe5
5.Qb2 Qe7 6.Bb7 Qe6 7.Bc6 Re5 8.Bd5 Qd7
9.Rf3 Qd8 10.h3 Rg3 11.Rxg3 hxg3 (2.147.483.647) 11542
21.00 3:49 +0.24 1...Rg3 2.hxg3 hxg3 3.Ra2 Rh5+ 4.Kg1 Qg5
5.Kf1 f3 6.Qxf3 Nf4 7.Ke1 Rh1+ 8.Kd2 Nxd5+
9.Ke2 Nf4+ 10.Qxf4 Qxf4 11.Rxh1+ Kg5
12.Kd3 Kg6 13.Rd2 Kg7 14.Ra2 (236.987.355) 1032
21.00 3:49 +0.24 1...Rg3 2.hxg3 hxg3 3.Ra2 Rh5+ 4.Kg1 Qg5
5.Kf1 f3 6.Qxf3 Nf4 7.Ke1 Rh1+ 8.Kd2 Nxd5+
9.Ke2 Nf4+ 10.Qxf4 Qxf4 11.Rxh1+ Kg5
12.Kd3 Kg6 13.Rd2 Kg7 14.Ra2 (2.147.483.647) 9357
22.00 4:15 -0.01 1...Rg3 2.hxg3 hxg3 3.Ra2 Rh5+ 4.Kg1 Rh2
5.Qf3 Qg5 6.Be6 Nh4 7.Qc3 Qc5+ 8.Rd4 Nf3+
9.gxf3 Qh5 10.Bh3 Qxh3 11.Rxd6+ cxd6
12.Qf6+ Kh5 13.Qf7+ Kg5 14.Qg7+ Kh5 (2.147.483.647) 8401
22.00 4:41 -0.01 1...Rg3 2.hxg3 hxg3 3.Ra2 Rh5+ 4.Kg1 Rh2
5.Qf3 Qg5 6.Be6 Nh4 7.Qc3 Qc5+ 8.Rd4 Nf3+
9.gxf3 Qh5 10.Bh3 Qxh3 11.Rxd6+ cxd6
12.Qf6+ Kh5 13.Qf7+ Kg5 14.Qg7+ Kh5 (2.147.483.647) 7625
23.00 5:00 -0.01 1...Rg3 2.hxg3 hxg3 3.Ra2 Rh5+ 4.Kg1 Rh2
5.Qf3 Qg5 6.Be6 Nh4 7.Qc3 Qc5+ 8.Rd4 Nf3+
9.gxf3 Qh5 10.Bh3 Qxh3 11.Rxd6+ cxd6
12.Qf6+ Kh5 13.Qf7+ Kg5 14.Qg7+ Kh5 (2.147.483.647) 7139
n/s: 7.139.952 nodes: 2.147.483.647
Code: Select all
8/p1p5/Pp1p2nk/1P1Bq1r1/2P1Pprp/1Q6/5RPP/3R3K b - -
Engine: Scorpio 2.4 JA 64-bit 4CPU (1024 MB)
by Daniel Shawul
14.00 0:01 +0.33 1...Rh5 2.Qf3 Rg3 3.Qe2 Re3 4.Qd2 Qc3
5.Qxc3 Rxc3 6.h3 Rg5 7.Kh2 Re3 8.Kg1 (12.123.732) 9471
14.00 0:01 +0.33 1...Rh5 2.Qf3 Rg3 3.Qe2 Re3 4.Qd2 Qc3
5.Qxc3 Rxc3 6.h3 Rg5 7.Kh2 Re3 8.Kg1 (12.763.896) 9454
15.00 0:01 +0.18 1...Rh5 2.Qf3 Rg3 3.Qe2 Re3 4.Qd2 Qc3
5.Qxc3 Rxc3 6.h3 Rg5 7.Rdf1 Re3
8.Rd2 Kg7 (17.174.881) 9758
15.00 0:01 +0.18 1...Rh5 2.Qf3 Rg3 3.Qe2 Re3 4.Qd2 Qc3
5.Qxc3 Rxc3 6.h3 Rg5 7.Rdf1 Re3
8.Rd2 Kg7 (19.080.498) 9784
16.00 0:02 +0.19 1...Rh5 2.Qf3 Rg3 3.Qe2 Re3 4.Qd2 Qc3
5.Qxc3 Rxc3 6.h3 Rg5 7.Rdf1 Kg7
8.Kh2 Rd3 9.Rf3 (26.403.119) 9963
16.00 0:03 +0.19 1...Rh5 2.Qf3 Rg3 3.Qe2 Re3 4.Qd2 Qc3
5.Qxc3 Rxc3 6.h3 Rg5 7.Rdf1 Kg7
8.Kh2 Rd3 9.Rf3 (30.815.415) 10070
17.00 0:05 0.00 1...Rh5 2.Qf3 Rg3 3.Qe2 Rhg5 4.Qd2 Ra3
5.Qc1 Rc3 6.Qd2 Ra3 (57.160.322) 10565
17.00 0:06 0.00 1...Rh5 2.Qf3 Rg3 3.Qe2 Rhg5 4.Qd2 Ra3
5.Qc1 Rc3 6.Qd2 Ra3 (63.792.015) 10614
18.00 0:12 0.00 1...Rh5 2.Rf3 Rhg5 3.Rf2 (138.700.813) 10999
18.00 0:17 0.00 1...Rh5 2.Rf3 Rhg5 3.Rf2 (189.305.081) 11089
19.00 0:27 0.00 1...Rh5 2.Rf3 Rhg5 3.Rf2 (305.785.317) 11237
19.00 0:38 0.00 1...Rh5 2.Rf3 Rhg5 3.Rf2 (430.757.603) 11311
20.00 1:02 0.00 1...Rh5 2.Rf3 Rhg5 3.Rf2 (712.831.430) 11334
20.00 1:28 0.00 1...Rh5 2.Rf3 Rhg5 3.Rf2 (1.007.532.885) 11328
21.00 2:19 0.00 1...Rh5 2.Rf3 Rhg5 3.Rf2 (1.580.041.574) 11308
21.00 3:04 0.00 1...Rh5 2.Rf3 Rhg5 3.Rf2 (2.081.963.152) 11286
22.00 5:11 0.00 1...Rh5 2.Rf3 Rhg5 3.Rf2 (2.147.483.647) 6901
22.00 6:50 0.00 1...Rh5 2.Rf3 Rhg5 3.Rf2 (2.147.483.647) 5236
best move: Rg5-h5 time: 10:27.046 min n/s: 5.236.360 nodes: 2.147.483.647