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Subject: Re: Perpetual Check

Author: David Dahlem

Date: 09:21:30 09/04/04

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On September 04, 2004 at 11:46:48, Ed Schröder wrote:

>Does someone possess a good test set for testing Perpetual Checks ?
>
>Thanks.
>
>Ed

Here is a position i found in the archives from 2001, with analysis by ProDeo.

[D]7k/4QP2/7p/6rP/8/1K6/6r1/8 b

ProDeo UCI  UCI1:
 1   00:00  M500  1. ... Kg7 2.f8Q+
 1   00:00  13.39   1. ... Kh7 2.f8Q+ Rg7 3.Qe4+ R2g6 4.hxg6+ Rxg6
 1   00:00  7.45   1. ... Rb2+ 2.Kxb2
 1   00:00  4.45   1. ... Rf2 2.f8Q+ Rxf8 3.Qxf8+ Kh7
 1   00:00  2.40   1. ... R2g3+ 2.Kc4
 2   00:00  2.40   1. ... R2g3+ 2.Kc4
 3   00:00  2.40   1. ... R2g3+ 2.Kc4 R3g4+ 3.Kd3
 4   00:00  2.44   1. ... R2g3+ 2.Kc4 R3g4+ 3.Kc3 Rg3+ 4.Kd4
 4   00:00  2.44   1. ... R5g3+ 2.Kc4 Rc2+ 3.Kd4 Rd2+ 4.Kc4
 5   00:00  2.43   1. ... R5g3+ 2.Kc4 Rc2+ 3.Kb4 Rb2+ 4.Kc5 Rc2+ 5.Kb4 Rb2+
6.Kc5 Rc2+
 5   00:00  2.40   1. ... R2g3+ 2.Kc4 R3g4+ 3.Kd3 Rg3+ 4.Kd4 R3g4+ 5.Kd3 Rg3+
6.Kd4 R3g4+
 6   00:00  2.33   1. ... R2g3+ 2.Kc4 R3g4+ 3.Kd3 Rg3+ 4.Kd4 R3g4+ 5.Ke3 Rg3+
6.Kd2 Rg2+ 7.Kc3 R2g3+ 8.Kd2 Rg2+ 9.Kc3 R2g3+
 7   00:00  2.33   1. ... R2g3+ 2.Kc4 R3g4+ 3.Kd3 Rg3+ 4.Kd4 R3g4+ 5.Ke3 Rg3+
6.Kd2 Rg2+ 7.Kc3 R2g3+ 8.Kc2 Rg2+ 9.Kc1 Rg1+ 10.Kc2 R1g2+ 11.Kc1 Rg1+ 12.Kc2
 8   00:00  2.10   1. ... R2g3+ 2.Kc4 R3g4+ 3.Kd3 Rg3+ 4.Kd4 R3g4+ 5.Ke3 Rg3+
6.Kd2 Rg2+ 7.Ke1 Rg1+ 8.Ke2 R1g2+ 9.Ke1 Rg1+ 10.Ke2 R1g2+
 9   00:00  1.76   1. ... R2g3+ 2.Kc4 R3g4+ 3.Kd3 Rg3+ 4.Kd4 R3g4+ 5.Ke3 Rg3+
6.Kd2 Rg2+ 7.Ke1 Rg1+ 8.Ke2 R1g2+ 9.Kd1 Rg1+ 10.Kc2 R1g2+ 11.Kd1 Rg1+ 12.Kc2
R1g2+
10   00:00  1.46   1. ... R2g3+ 2.Kc4 R3g4+ 3.Kd3 Rg3+ 4.Kd4 R3g4+ 5.Ke3 Rg3+
6.Kd2 Rg2+ 7.Ke1 Rg1+ 8.Ke2 R1g2+ 9.Kd1 Rg1+ 10.Kc2 R1g2+ 11.Kc3 R2g3+ 12.Kb4
R3g4+ 13.Ka3
11   00:01  1.58   1. ... R2g3+ 2.Kc4 R3g4+ 3.Kd3 Rg3+ 4.Ke4 R3g4+ 5.Kf3 Rg3+
6.Ke2 Rg2+ 7.Kd1 Rg1+ 8.Kc2 R1g2+ 9.Kc3 R2g3+ 10.Kb4 R3g4+ 11.Ka3 Rg3+ 12.Kb2
Rg2+ 13.Kc1
12   00:02  0.00   1. ... R2g3+ 2.Kc4 R3g4+ 3.Kd3 Rg3+ 4.Ke4 R3g4+ 5.Ke3 Rg3+
6.Kd4 R3g4+ 7.Ke3 Rg3+ 8.Kd4 R3g4+
13   00:05  1.66   1. ... R2g3+ 2.Kc4 R3g4+ 3.Kd3 Rg3+ 4.Ke4 R3g4+ 5.Ke3 Rg3+
6.Kd4 R3g4+ 7.Ke3 Rg3+ 8.Kd4 R3g4+
14   00:08  0.00   1. ... R2g3+ 2.Kc4 R3g4+ 3.Kc3 Rg3+ 4.Kb4 R3g4+ 5.Kc3 Rg3+
6.Kb4 R3g4+
15   00:14  0.00   1. ... R2g3+ 2.Kc4 R3g4+ 3.Kc3 Rg3+ 4.Kb4 R3g4+ 5.Kc3 Rg3+
6.Kb4 R3g4+
16   00:25  0.00   1. ... R2g3+ 2.Kc4 R3g4+ 3.Kc3 Rg3+ 4.Kb4 R3g4+ 5.Kc3 Rg3+
6.Kb4 R3g4+

Regards
Dave



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