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Subject: Re: test position

Author: Chris Welty

Date: 23:42:45 09/25/04

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On September 25, 2004 at 18:01:37, David B Weller wrote:

>[D]7r/1kpr1pp1/pPn1p3/2Q1P3/3Pq3/2P1N2p/1R3PP1/4R1K1 w - -
>
>Ges has a REAL HARD time with this [pushes extensions out to 45 ply!]
>
>any ideas why? I got my chess board out now....
>
>BTW - crafty gets this is like 3 seconds  arrggg.....

It looks like d5 and f3 both win.


I seem to be getting a lot of extensions too, the 3-ply search has a 10=-ply PV.
Perhaps limit your extensions to 1 ply each ply? Some programs also have a
maximum number of plies, I think around 3*nominal search depth; Altamax doesn't
have this.

1 275 0 2684  bxc7+  47.0ms
2 262 0 9079  bxc7+ Kc8 Qb6 Rxc7 Qxa6+ Kd7  140ms
3 236 0 45446  d5 Rxd5 bxc7+ Kxc7 Nxd5+ Qxd5 Qb6+ Kd7 Qb7+ Ke8  625ms
4 300 0 168578  f3 h2+ Kh1 Qh4 Reb1 Rdd8 bxc7+ Kxc7  2.23s
5 406 0 383822  f3 h2+ Kh1 Qh4 Reb1 Nb4 bxc7 Rxc7 Rxb4+ Kc8 4.64s
6 516 0 2619861  f3 Qh4 Reb1 Kc8 Qxc6 Kd8  30.0s
7 657 0 10350638  d5 h2+ Kh1 exd5 bxc7+ Kc8 Qxc6 Rxc7 Qa8+ Kd7 Qxh8 Qxe5 Qxh2
Qxc3  121s
8 712 0 47450046  f3 h2+ Kh1 Qd3 bxc7+ Kxc7 Qb6+ Kc8 Qxc6+ Rc7 Qa8+ Kd7 Qxh8
Qxc3 Rbb1 g5 Qxh2 Qxd4  534s



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