Author: Mike Byrne
Date: 16:19:07 07/24/02
Go up one level in this thread
On July 24, 2002 at 17:56:04, Nolan Denson wrote:
>Ok i was trying to read up on extension and ran across this conversation. So
>what I am wondering how much have we improved with todays programs and faster
>computers ... ( This post will be the first time that i see this position) it
>may be a test problem now.
>
>>Posted by Howard Exner on January 09, 1998 at 21:03:51:
>
>r3rk2/ppq2pbQ/2p1b1p1/4p1B1/2P3P1/3P1B2/P3PPK1/1R5R w - - id"Seiriwan -
>>>Sokolov,A" bm Qxg7+;
>
>>I am always interested in the problems that program X finds quickly
>>while program Y struggles. It makes me curious as to what makes them
>>tick. Rebel 8 for example finds WAC 141 rather quickly but has a very
>>hard time finding this above mate in 7. I think it is the quiet move,
>>Bf6 that is the stumbling block for Rebel.
>
>I checked with Rebel9. Rebel9 needs 22:00 and 11 plies.
>
>The "killer" here is not 3.Bf6 but 6.Rh1
>
>The main variation found:
>
>1.Qxg7 Kxg7 2.Rh7+ Kxh7 3.Bf6 g5 4.Be4+ Bf5 5.Bxf5+ Kg8 6.Rh1 and
>mate on the next move.
>
>I am currently working on a better tactical version. It finds 1.Qxg7
>in 3:28 on ply 9 but the version in question is 25-30% slower in normal
>positional play.
>
>As always the big question remains if "improved" tactics will result
>in an overall improvement.
>
>For the moment I have baptized this version as Rebel Turtle and I hope
>auto232 will tell me more.
>
>I receive a lot of input from customers. Sometimes they tell you
>something you will not forget your whole life. One of them once said:
>
>"You guys release new versions and every new version only does
>better on points where it was already good"
>
>While I believe this is not the entire truth the man has a point :))
How about this from Crafty 17.14 SE (available for free vai -mail to
mfbyrne_pa@msn.com
max threads set to 2
null depth set to 2/3 (min/max)
EGTB cache memory = 20M bytes.
hash table memory = 192M bytes.
pawn hash table memory = 40M bytes.
play best book line after search.
choose from 3 best moves.
book learning disabled
result learning disabled
position learning disabled
pondering disabled.
noise level set to 500000.
search time set to 600.00.
one-reply extension..................0.75
in-check extension..................1.00
recapture extension..................0.75
pushpp extension..................0.75
mate thrt extension..................0.75
singular extension..................0.75
one-reply extension..................0.75
in-check extension..................1.00
recapture extension..................0.75
pushpp extension..................0.75
mate thrt extension..................1.00
singular extension..................0.75
Usage: booster <base> <max> <intensity>
Booster <base> minimum 0 - maximum 120 (2X above ply).
Booster <max> minimum 0 - maximum 180 (3X above ply).
Booster <intensity> minimum 0 - maximum 300
Example: booster 45 75 225
Would set the base @ 1.75 ply and the max @ 2.25 ply with an intensity of
225
with an intensity of 225
booster 60 60 0 = standard crafty
'max' must be >= 'base'
Decimals are NOT allowed.
Extension booster set to 88 : 60 : 225 (base:max:intensity)
Crafty v17.14 (2 cpus)
White(1): boos 76 76 225
Extension booster set to 76 : 76 : 225 (base:max:intensity)
White(1): ext in 1
one-reply extension..................0.75
in-check extension..................1.00
recapture extension..................0.75
pushpp extension..................0.75
mate thrt extension..................1.00
singular extension..................0.75
White(1): st 60000
search time set to 60000.00.
[D] r3rk2/ppq2pbQ/2p1b1p1/4p1B1/2P3P1/3P1B2/P3PPK1/1R5R w - - id"Seiriwan -
White(1): d
White(1): go
clearing hash tables
time surplus 0.00 time limit 1000:00 (1000:00)
nss depth time score variation (1)
starting thread 1
7 1.22 0.38 1. Rh2 Qd7 2. Rbh1 f5 3. gxf5 gxf5
4. Rh5
(3) 7-> 1.22 0.38 1. Rh2 Qd7 2. Rbh1 f5 3. gxf5 gxf5
4. Rh5
(2) 8 1.63 0.30 1. Rh2 Qd7 2. Rbh1 f5 3. gxf5 gxf5
4. Bh5 Bf7
8 2.35 0.35 1. Rh4 Rec8 2. Rbh1 f6 3. Bh6 Bxh6
4. Qxc7 Rxc7 5. Rxh6
8 3.05 0.39 1. Bc1 Rab8 2. Bh6 Bxh6 3. Qxh6+ Ke7
4. Qe3 a5 5. Rh7
(3) 8-> 3.05 0.39 1. Bc1 Rab8 2. Bh6 Bxh6 3. Qxh6+ Ke7
4. Qe3 a5 5. Rh7
9 3.28 -- 1. Bc1
(2) 9 5.66 -0.09 1. Bc1 Rab8 2. a3 b6 3. Bh6 Bxh6 4.
Rxh6 e4 5. Bxe4 Bxg4
9 6.33 ++ 1. Rh4!!
9 9.44 1.21 1. Rh4 Rec8 2. Rbh1 f6 3. Bh6 Bxh6
4. Qxh6+ Kf7 5. Qh7+ Ke8 6. Qxg6+ Qf7
7. Qe4
(2) 9-> 9.78 1.21 1. Rh4 Rec8 2. Rbh1 f6 3. Bh6 Bxh6
4. Qxh6+ Kf7 5. Qh7+ Ke8 6. Qxg6+ Qf7
7. Qe4
10 12.11 1.21 1. Rh4 Rec8 2. Rbh1 f6 3. Bh6 Bxh6
4. Qxh6+ Kf7 5. Qh7+ Ke8 6. Qxg6+ Qf7
7. Qe4
10 13.93 ++ 1. Qh8+!!
10 14.86 Mat08 1. Qh8+ Bxh8 2. Rxh8+ Kg7 3. Rh7+ Kxh7
4. Bf6 Bxg4 5. Bxg4 e4 6. Rh1+ Qh2+
7. Rxh2+ Kg8 8. Rh8#
10 15.14 Mat07 1. Qxg7+ Kxg7 2. Rh7+ Kxh7 3. Bf6 Bxg4
4. Bxg4 e4 5. Rh1+ Qh2+ 6. Rxh2+ Kg8
7. Rh8#
(4) 10-> 15.24 Mat07 1. Qxg7+ Kxg7 2. Rh7+ Kxh7 3. Bf6 Bxg4
4. Bxg4 e4 5. Rh1+ Qh2+ 6. Rxh2+ Kg8
7. Rh8#
(3) 11 15.61 Mat07 1. Qxg7+ Kxg7 2. Rh7+ Kxh7 3. Bf6 Bxg4
4. Bxg4 e4 5. Rh1+ Qh2+ 6. Rxh2+ Kg8
7. Rh8#
(4) 11-> 17.13 Mat07 1. Qxg7+ Kxg7 2. Rh7+ Kxh7 3. Bf6 Bxg4
4. Bxg4 e4 5. Rh1+ Qh2+ 6. Rxh2+ Kg8
7. Rh8#
(3) 12 17.77 Mat07 1. Qxg7+ Kxg7 2. Rh7+ Kxh7 3. Bf6 Bxg4
4. Bxg4 e4 5. Rh1+ Qh2+ 6. Rxh2+ Kg8
7. Rh8#
White(1): ?
time=28.63 cpu=284% mat=0 n=38605294 fh=96% nps=1348421
ext-> checks=2122137 recaps=0 pawns=4659 pawn_sac=217591
ext-> 1rep=245531 thrt:20001 boos:0
predicted=0 nodes=38605294 evals=3114783
endgame tablebase-> probes done=0 successful=0
SMP-> split=745 stop=50 data=9/64 cpu=1:21 elap=28.63
mate in 7 moves.
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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