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Subject: Re: mate in 18 was not enough how about 22 moves ahead

Author: John Merlino

Date: 09:31:18 08/25/05

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On August 25, 2005 at 01:09:52, Vegadapirate wrote:

>Hi John , if The King finds that here try this one white is totally lossing this
>position you can start up the position with any chess engine and it shows white
>lossing but white to move and DRAW the game...
>
>[D] 2br4/r2pp3/8/1p1p1kN1/pP1P4/2P3R1/PP3PP1/2K5 w - - 0 1

This, of course, is a completely different kind of problem. I don't know what
the answer is, but if it involves a way for White to get a draw by perpetual
check, then The King (and most other engines) will have a very difficult time
showing a draw score. They might show the right move, and even a series of
checks in the PV, but the score will still favor Black due to the material
advantage.

Here is what The King says:

Time	Depth	Score	Positions	Moves
0:00	1/4	-2.62	2145		1.Nf7 Re8 2.Nh6+ Ke4 3.Re3+ Kf4
					4.Rf3+ Kg5
0:00	1/5	-2.53	6314		1.Nf7 Re8 2.Nh6+ Ke4 3.Nf7 Ra6
0:00	1/6	-2.84	20160		1.Nf7 Re8 2.Nh6+ Kf6 3.Kd2 Rh8
					4.Rf3+ Kg6 5.Nf7
0:00	1/7	-2.92	65741		1.Nf7 Re8 2.Re3 Ra6 3.Rf3+ Ke6
					4.Nh6 Rh8
0:00	1/8	-3.04	137932		1.Nf7 Re8 2.Nh6+ Kf6 3.Kd2 d6 4.Ng8+
					Ke6 5.Nh6 Rf8
0:01	1/9	-3.03	339079		1.Nf7 Re8 2.Re3 Ra6 3.Rf3+ Kg6
					4.Ne5+ Kg7 5.Rg3+ Kh7 6.Kd2 Rf6
0:03	1/10	-3.18	754625		1.Nf7 Re8 2.Rf3+ Ke6 3.g4 d6 4.Nh6
					Kd7 5.g5 Rh8 6.Kd2
0:06	1/11	-3.19	1696773		1.Nf7 Re8 2.Rf3+ Ke6 3.g4 Rg8 4.Nh6
					Rg6 5.Re3+ Kf6 6.Rf3+ Kg5 7.Nf7+
					Kh4 8.Ne5 Rg5
0:15	2/12	-3.13	3876922		1.Nf7 Re8 2.Rf3+ Ke6 3.g4 Rg8 4.Nh6
					Rg6 5.Re3+ Kf6 6.Rf3+ Kg5 7.Nf7+
					Kh4 8.Ne5 Rf6
0:42	3/13	-3.31	10960577	1.Nf7 Re8 2.Nh6+ Kf6 3.Ng4+ Ke6
					4.Ne3 d6 5.f4 Bb7 6.Rg6+ Kd7 7.f5
					Raa8 8.Kd2 Rh8
1:35	4/14	-3.40	24989331	1.Nf7 Re8 2.Nh6+ Kf6 3.Ng4+ Ke6
					4.Ne3 Bb7 5.Kd2 a3 6.b3 Raa8 7.Rg6+
					Kf7 8.Rg4 Rg8 9.Rh4 Rg7
4:18	5/15	-3.42	68301446	1.Nf7 Re8 2.Nh6+ Kf6 3.Ng4+ Ke6
					4.Re3+ Kf5 5.Rg3 d6 6.Ne3+ Ke6
					7.Rg5 Bb7 8.f4 Raa8 9.g4 Rg8 10.Rh5
					Kd7

What's the answer?

jm



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