Author: David Rasmussen
Date: 12:37:07 01/16/03
Go up one level in this thread
[D]8/4n3/1k6/1p4p1/1P4P1/1K6/3B4/8 w - - 0 1 In a position such as this, this is Chezzz _without_ EGTBs: I'm thinking... time nodes depth score pv 00:00:00.19 146kn 09/12/14 +1.125 1. Bxg5 Ng6 2. Bf6 Kc6 3. Kc3 Kd5 4. Kd2 Ke4 5. Ke2 (146312) 00:00:00.25 191kn 09/14/15 --------------------------------------------------- 00:00:00.41 296kn 10/14/15 +1.085 1. Bxg5 Ng6 2. Bf6 Kc6 3. Kc3 Kd5 4. Kd3 Ke6 5. Bd4 Ne5+ 6. Bxe5 Kxe5 (296663) 00:00:00.55 391kn 10/15/16 --------------------------------------------------- 00:00:00.67 491kn 11/16/17 +1.085 1. Bxg5 Ng6 2. Bf6 Kc6 3. Kc3 Kd5 4. Kd3 Ke6 5. Bd4 Ne5+ 6. Bxe5 Kxe5 (491020) 00:00:00.91 677kn 11/17/18 --------------------------------------------------- 00:00:01.53 1150kn 12/17/19 +1.130 1. Bxg5 Ng6 2. Kc3 Ne5 3. Bd8+ Kc6 4. g5 Kd5 5. Bc7 Ng6 6. Kd3 Ke6 7. Ke4 (1150376) 00:00:01.83 1393kn 12/18/19 --------------------------------------------------- 00:00:03.63 2787kn 13/20/21 +1.075 1. Bxg5 Nd5 2. Bd2 Kc6 3. Kc2 Kd6 4. Kd3 Ke5 5. g5 Ne7 6. Bc3+ Kd5 7. Bd4 Ng6 (2787724) 00:00:04.49 3467kn 13/20/23 --------------------------------------------------- 00:00:06.83 5239kn 14/20/22 +1.040 1. Bxg5 Nd5 2. Bd2 Kc6 3. Kc2 Kd6 4. Kd3 Ke5 5. g5 Kf5 6. Kd4 Nc7 7. Kc3 Ke4 (5239484) 00:00:07.85 6053kn 14/22/23 --------------------------------------------------- 00:00:15.24 11Mn 15/22/24 +0.855 1. Bxg5 Nd5 2. Bd2 Kc6 3. Ka3 Kd6 4. Bg5 Kd7 5. Kb3 Ke6 6. Bd8 Ke5 7. g5 Kf5 8. Ka3 (11513787) 00:00:18.97 13Mn 15/23/25 --------------------------------------------------- 00:00:28.80 20Mn 16/24/27 1/11 1. Bxg5 Time used: 00:00:30.00 nps: 718426 nodes: 21559976 Q-nodes: 707976 (3%) move order: 94% hash probes: 8770930 hash hits: 5045831 (57%) hash usage: 99% pawn hash probes: 9470211 pawn hash hits: 9469820 (99%) EGTB probes: 0 1. Bxg5 This is Chezzz _with_ EGTBs: time nodes depth score pv 00:00:00.22 139kn 09/12/14 +1.125 1. Bxg5 Ng6 2. Bf6 Kc6 3. Kc3 Kd5 4. Kd2 Ke4 5. Ke2 (139961) 00:00:00.29 184kn 09/14/15 --------------------------------------------------- 00:00:00.45 284kn 10/14/15 +1.085 1. Bxg5 Ng6 2. Bf6 Kc6 3. Kc3 Kd5 4. Kd3 Ke6 5. Bd4 Ne5+ 6. Bxe5 Kxe5 (284263) 00:00:00.58 370kn 10/15/17 --------------------------------------------------- 00:00:00.73 472kn 11/15/16 +1.085 1. Bxg5 Ng6 2. Bf6 Kc6 3. Kc3 Kd5 4. Kd3 Ke6 5. Bd4 Ne5+ 6. Bxe5 Kxe5 (472265) 00:00:01.00 650kn 11/17/19 --------------------------------------------------- 00:00:01.42 920kn 12/18/19 +1.130 1. Bxg5 Ng6 2. Kc3 Ne5 3. Bd8+ Kc6 4. g5 Kd5 5. Bc7 Ng6 6. Kd3 Ke6 7. Ke4 (920316) 00:00:01.75 1149kn 12/18/19 --------------------------------------------------- 00:00:03.48 2310kn 13/20/21 +1.075 1. Bxg5 Nd5 2. Bd2 Kc6 3. Kc2 Kd6 4. Kd3 Ke5 5. g5 Ne7 6. Be3 Ng6 7. Bd4+ Kd5 (2310354) 00:00:04.45 2971kn 13/20/21 --------------------------------------------------- 00:00:12.04 4334kn 14/20/23 +1.040 1. Bxg5 Nd5 2. Bd2 Kc6 3. Kc2 Kd6 4. Kd3 Ke5 5. g5 Kf5 6. Kd4 Nc7 7. Kc3 Ke4 (4334933) 00:00:17.61 5058kn 14/21/23 --------------------------------------------------- 00:00:22.70 6143kn 15/20/22 1/11 1. Bxg5 Time used: 00:00:30.00 nps: 234538 nodes: 7038510 Q-nodes: 196510 (2%) move order: 95% hash probes: 3162813 hash hits: 2220367 (70%) hash usage: 87% pawn hash probes: 2866265 pawn hash hits: 2865984 (99%) EGTB probes: 25055 1. Bxg5 That is quite a speed drop. What I don't understand is that during this search, the disk is working like crazy. I only probe in the first 2 plys. There is 11 legal moves in the position, so that's roughly 100 positions. That can't take that much activity to probe. And then I only probe within the iteration depth, and only then if there have been a capture or a promotion, and only if the number of pieces on the board is small enough (<= 5 for 3-5 man tables). In this position, there is of course a capture now and then, and a promotion sometimes too. But why this constant disk access? It really feels to me as if it's the disk I/O that's killing me, and not because I have a slow disk, but because there is far too much disk activity for some reason. And the reason isn't that I probe too often due to a bug, because my probe numbers are like everybody elses. You can see that I get about 25000 probes on a 30 second think on an Athlon XP 1800+. How much do you get? /David
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