Author: Robert Hyatt
Date: 06:32:07 10/21/00
Go up one level in this thread
On October 21, 2000 at 05:28:14, Uri Blass wrote:
>I composed this position to see if chessmaster can see perpetual check.
>
>[D]4k3/6RQ/6PP/8/r7/8/r7/7K b - - 0 1
>
>The target is to see 0.00 score
>
>I found that chessmaster does not see the draw even after some minutes but after
>Ra1+ Kg2 it can see the draw very quickly in clearly smaller depth.
>
>The same after Ra1+ Kh2
>
>I tried also Fritz5.32 and it does not see the draw at least after a short time.
>
>If I give Fritz5.32 the moves Ra1+ Kg2 it can see the draw but after Ra1+ Kh2
>it has problems to see the draw.
>
>Fritz5.32 expects Kg2 when it plays Ra1+ and wants to play Kg2 at depth 13 with
>evaluation 0.00.
>
>How many squares can the white king visit before the repetition?(it is clear
>that the white king cannot visit all the 21 squares (b1-b3... h1-h3))
>
>Uri
It takes a 17 ply search in Crafty to find this. Which takes 90 seconds
on my PII/400 notebook:
17 1:33 ++ 1. ... Ra1+!!
17 1:38 0.00 1. ... Ra1+ 2. Kh2 R1a2+ 3. Kh3 R2a3+
4. Kh2 Ra2+
17-> 1:46 0.00 1. ... Ra1+ 2. Kh2 R1a2+ 3. Kh3 R2a3+
4. Kh2 Ra2+
18 1:55 0.00 1. ... Ra1+ 2. Kh2 R1a2+ 3. Kh3 R2a3+
4. Kh2 Ra2+
18-> 2:05 0.00 1. ... Ra1+ 2. Kh2 R1a2+ 3. Kh3 R2a3+
4. Kh2 Ra2+
19 2:18 0.00 1. ... Ra1+ 2. Kh2 R1a2+ 3. Kh3 R2a3+
4. Kh2 Ra2+
19-> 2:33 0.00 1. ... Ra1+ 2. Kh2 R1a2+ 3. Kh3 R2a3+
4. Kh2 Ra2+
20 2:56 0.00 1. ... Ra1+ 2. Kh2 R1a2+ 3. Kh3 R2a3+
4. Kh2 Ra2+
20-> 3:34 0.00 1. ... Ra1+ 2. Kh2 R1a2+ 3. Kh3 R2a3+
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.