Author: Dan Newman
Date: 00:57:11 02/09/00
Go up one level in this thread
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.
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