Author: Dann Corbit
Date: 12:52:39 01/16/03
Go up one level in this thread
On January 16, 2003 at 15:37:07, David Rasmussen wrote:
>[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
Beowulf output:
Position 1 - White to play
--------------------------
ID =
FEN = 8/4n3/1k6/1p4p1/1P4P1/1K6/3B4/8 w - -
. . . . . . . .
. . . . n . . .
. k . . . . . .
. p . . . . p .
. P . . . . P .
. K . . . . . .
. . . B . . . .
. . . . . . . .
Current Position = 0.52
Number of Possible Moves = 11
11 236 75 143184 Bxg5 Ng6 Kc3 Ne5 Be3+ Kc6 g5 Kd7 Kd4 Ke6 g6
12 231 178 352812 Bxg5 Ng6 Kc3 Ne5 Be3+ Kc6 g5 Kd5 Bd4 Nf3 g6 Kd6
13 219 266 528614 Bxg5 Ng6 Kc3 Ne5 Bd8+ Kc6 g5 Kd7 Bf6 Ng4 Kd3 Ke6
Bd8 Kf5
14 213 606 1216211 Bxg5 Nd5 Bd2 Kc6 g5 Ne7 Kc3 Kd5 Kd3 Ke5 Be1
15 213 1009 1942140 Bxg5 Nd5 Bd2 Kc6 g5 Ne7 Bc3 Kd5 Bf6 Ng6 Kc2 Ke4
Bd8 Ke5 Bf6+ Ke4 &rep.
16 214 1759 3325204 Bxg5 Nd5 Bc1 Kc6 Kc2 Nxb4+ Kb3 Nd3 Bd2 Kd5 Kc3
Ne5 Kb3
17 214 3000 5733741 Bxg5 Nd5 Bc1 Kc6 g5 Ne7 Kc2 Kd5 Kd3 Ke5 Bd2 Nd5
Be1 Ne7
Search Time : 30.00 Seconds
Total Nodes Searched : 5733741 (52.3% Qui)
Total Nodes Evaluated : 2998609
Cuts : Delta 1508 : SEE 18270 : Mate 0
: Razor 202628 : Eval 1107291
Extensions : Check 151560 : OneRep 45 : CMThreat 8317
: Pawn 42183 : Recap 2342 : RevCheck 4278
Hash Stores (Size) : 582291 (699037)
Hash Probes (Hits) : 5384740 (3263270)
EGTB Probes (Hits) : 46423 (46423)
Move Ordering : 81.9%
Best Move = Bxg5
Move Score = 214
--Answer: Bxg5 ** Correct **
Time To Solution = 0.00 sec
Correct So Far : 1/1
Test Completed.
Results;
Correct : 1/1
Average Time To Solution = 0.00 sec
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