Author: Bernhard Bauer
Date: 04:58:31 02/09/00
Go up one level in this thread
On February 09, 2000 at 05:27:21, Andrew Williams wrote:
>On February 09, 2000 at 03:57:11, Dan Newman wrote:
>
>>On February 08, 2000 at 20:36:01, Dann Corbit wrote:
>>
>>>On February 08, 2000 at 20:33:06, John Merlino wrote:
>>>
>>>>On February 08, 2000 at 20:11:50, Dann Corbit wrote:
>>>>
>>>>>2bnN1k1/6P1/4p3/1P2N1P1/3K4/8/8/8 w - -
>>>>
>>>>Well, Chessmaster finds it "instantly"....
>>>>
>>>>1. g6 Kb7 2.Nc6 e5+ 3.Kxe5 Na5 4.Ne7++ is one example....
>>>>
>>>>Was this supposed to be particularly difficult for chess engines?
>>>
>>>It is either difficult or easy. Some take a long time, and some solve it
>>>instantly. It does not look like a null move problem, so I am wondering why
>>>the differences.
>>
>>Here's what Shrike gets on a PIII/500.
>>
>>With null move turned on:
>>
>>10> 1086 0.96 339244 Kc3 Nb7 Ng4 Kf7 Nf6 Ke7 g8=Q Nd8 Qh7+ Nf7
>> g6
>>11- 1068 1.07 389401 Kc3 Nb7 Ng4 Kf7 Nf6 Ke7 g8=Q Nd8 Qh7+ Nf7
>> g6
>>11+ 1069 1.18 431910 Kc3
>>11. 1231 1.68 729056 Kc3 Nb7 Ng4 Kf7 Nf6 Kg6 g8=Q+ Kf5 Ng7+ Kxg5
>> Nh5+ Kf5 Qxc8 Nd6
>>11> 1231 1.68 729074 Kc3 Nb7 Ng4 Kf7 Nf6 Kg6 g8=Q+ Kf5 Ng7+ Kxg5
>> Nh5+ Kf5 Qxc8 Nd6
>>12+ 1249 1.92 869672 Kc3
>>12. 1270 2.80 1430798 Kc3 Bb7 g6 Be4 Ng4 Bxg6 Nf6+ Kf7 g8=Q+ Ke7
>> Qxg6 Nf7 b6 Ne5 Qg7+
>>12+ 1288 3.01 1554227 g6
>>12> +mate4 3.17 1649275 g6 Nb7 Nc6 e5+ Kxe5 Bf5 Ne7# <Checkmate>
>>
>>
>>With Null-move off:
>>
>> 1. 510 0.00 2 b6
>> 1> 510 0.00 23 b6
>> 2. 498 0.00 40 b6 Kh7
>> 2. 510 0.00 59 g6 Nb7
>> 2> 510 0.00 159 g6 Nb7
>> 3+ 528 0.00 185 g6
>> 3. 550 0.00 229 g6 Nb7 b6
>> 3+ 568 0.00 582 Nc6
>> 3. 597 0.00 771 Nc6 e5+ Kxe5 Ne6
>> 3> 597 0.00 1247 Nc6 e5+ Kxe5 Ne6
>> 4+ 615 0.01 1788 g6
>> 4. 636 0.01 2131 g6 Bb7 Nd7 e5+ Kxe5 Ne6
>> 4> 636 0.03 4452 g6 Bb7 Nd7 e5+ Kxe5 Ne6
>> 5+ 654 0.03 4765 g6
>> 5> +mate4 0.03 6495 g6 Nb7 Nf7 e5+ Kxe5 Nc5 Nh6# <Checkmate>
>>
>>So, at least with Shrike there seems to be some sort of deleterious
>>null-move effect...
>>
>>-Dan.
>
>Ditto for PostModernist. Without null-move, it resolves the mate-in-4 score
>after 8 seconds (ply 7). With null-move, it finds g6 in less than 2 seconds,
>but 6 minutes later it is stuck in ply 9 and still hasn't found anything
>better than mate-in-6.
>
>BTW Congratulations on Shrike's performance at CCT1. I'm still recovering
>from the shock I got when you told me how fast it searches. :-)
>
>Andrew
Ditto for Crafty. Without null-move ...
time surplus 0.00 time limit 10:00 (10:00)
nss depth time score variation (1)
starting thread 1
6 0.10 Mat04 1. g6 Nc6+ 2. Nxc6 e5+ 3. Kxe5 Bb7
4. Ne7#
(2) 6-> 0.13 Mat04 1. g6 Nc6+ 2. Nxc6 e5+ 3. Kxe5 Bb7
4. Ne7#
7 0.14 Mat04 1. g6 Nc6+ 2. Nxc6 e5+ 3. Kxe5 Bb7
4. Ne7#
(4) 7-> 0.36 Mat04 1. g6 Nc6+ 2. Nxc6 e5+ 3. Kxe5 Bb7
4. Ne7#
time=0.52 cpu=596% mat=2 n=186690 fh=98% nps=366058
ext-> checks=13663 recaps=623 pawns=1263 1rep=1605 thrt:0
predicted=0 nodes=186690 evals=2175
endgame tablebase-> probes done=0 successful=0
hashing-> trans/ref=45% pawn=99% used=2%
SMP-> split=63 stop=6 data=5/64 cpu=3.04 elap=0.51
Kind regards Bernhard
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.