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Subject: Re: A test position about perpetual check(Junior-Insomniac)

Author: Uri Blass

Date: 08:50:45 11/05/00

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On November 05, 2000 at 09:09:29, Thomas Mayer wrote:

>Hi Uri,
>
>>[D]Q3b3/3k1p2/4p2P/3pP3/1q6/8/Q5K1/8 b - - 0 1
>
>>I believe that in this position black can force perpetual check by Qe4+
>
>>How much time do chess programs need to see the perpetual check(I did not prove
>>that there is a perpetual check but comp-comp games from this position ended in
>>a draw).
>
>Here some Analysis from Goliath Light of the Young Talents:
>
>Analysis by Goliath Light:
>
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2
>  =  (0.00)   Tiefe: 6/22   00:00:00
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2
>  =  (0.00)   Tiefe: 6/22   00:00:00  195kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2
>  =  (0.00)   Tiefe: 7/22   00:00:00  200kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2
>  =  (0.00)   Tiefe: 7/22   00:00:00  232kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2
>  =  (0.00)   Tiefe: 8/25   00:00:00  468kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2
>  =  (0.00)   Tiefe: 8/25   00:00:00  558kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2
>  =  (0.00)   Tiefe: 9/25   00:00:01  618kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2
>  =  (0.00)   Tiefe: 9/25   00:00:01  805kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2
>  =  (0.00)   Tiefe: 10/27   00:00:01  1421kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2 Dg5+ 9.Kd3 Df5+
>  =  (0.00)   Tiefe: 10/28   00:00:02  1829kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2 Dg5+ 9.Kd3 Df5+
>  =  (0.00)   Tiefe: 11/28   00:00:02  2119kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2 Dg5+ 9.Kd3 Df5+
>  =  (0.00)   Tiefe: 11/30   00:00:03  3325kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2 Dg5+ 9.Kd3 Df5+
>  =  (0.00)   Tiefe: 12/31   00:00:05  5128kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2 Dg5+ 9.Kd3 Df5+
>  =  (0.00)   Tiefe: 12/32   00:00:07  7942kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2 Dg5+ 9.Kd3 Df5+
>  =  (0.00)   Tiefe: 13/32   00:00:10  10964kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2 Dg5+ 9.Kd3 Df5+
>  =  (0.00)   Tiefe: 13/38   00:00:19  23021kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2 Dg5+ 9.Kd3 Df5+
>  =  (0.00)   Tiefe: 14/39   00:00:24  27940kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2 Dg5+ 9.Kd3 Dg6+ 10.Kd4
>  =  (0.00)   Tiefe: 14/39   00:00:53  61411kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2 Dg5+ 9.Kd3 Dg6+ 10.Kd4
>  =  (0.00)   Tiefe: 15/42   00:01:06  75038kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2 Dg5+ 9.Kd3 Dg6+ 10.Kd4
>  =  (0.00)   Tiefe: 15/44   00:04:39  289193kN
>1...Dg4+ 2.Kf2 Df4+ 3.Ke2 Dxe5+ 4.Kd2 Dg5+ 5.Ke2 Dh5+ 6.Kd2 Dxh6+ 7.Ke2 Dh5+
>8.Kd2 Dg5+ 9.Kd3 Dg6+ 10.Kd4
>  =  (0.00)   Tiefe: 16/47   00:05:23  343040kN
>
>(Mayer, Mayer International 05.11.2000)
>
>We all know that Goliath thinks sometimes it is a draw when there is no draw,
>but for me Goliath's line seems to be okay, what do you think ?
>
>Greets, Thomas

I do not like the line.
I suspect that after 3...Qxe5+ 4.Kd1 white is winning because the white queen
can help in defending from checks.

I think that 3...Qxe5+ is a mistake.

Uri



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