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Subject: Re: White to Play and Win...!

Author: Mike Byrne

Date: 21:25:20 11/01/03

Go up one level in this thread


On November 01, 2003 at 16:17:30, John Merlino wrote:

>On November 01, 2003 at 09:22:28, Art Basham wrote:
>
>>[D]8/5pk1/1Q3bp1/P6p/7P/5KP1/1r3P2/8 w - - 0 1
>>
>>How many ply to find 1. QXR...!?
>>
>>Fritz7 takes 13 ply...(some programs only 11 ply...Phallanx20 = 8ply)...
>>
>>This is too difficult for most table top machines!
>>
>>RISC finds it in about 20 minutes!
>
>Chessmaster 9000, on a P4-2.4, finds Rxb2 in 22 seconds. But then there's a long
>fail-high on Qd6 that doesn't resolve until after five minutes:
>
>Time	Depth	Score	Positions	Moves
>0:00	1/5	2.94	8913		1.Qd6 Ra2 2.a6 Ra5 3.Kg2
>0:00	1/6	2.98	21700		1.Qd6 Rb3+ 2.Kg2 Rb1 3.a6 Ra1 4.Kf3
>					Ra4
>0:00	1/7	3.01	53613		1.Qd6 Ra2 2.a6 Ra5 3.Kg2 Be5 4.Qc6
>					Bd4
>0:00	1/8	3.08	96152		1.Qd6 Ra2 2.a6 Ra5 3.Kg2 Be5 4.Qb6
>					Ra1 5.Qb7
>0:01	1/9	3.16	228449		1.Qd6 Ra2 2.a6 Ra5 3.Qb6 Ra3+ 4.Ke4
>					Ra4+ 5.Kd5 Ra2 6.a7 Rd2+ 7.Kc6
>0:02	1/10	3.19	484021		1.Qd6 Ra2 2.a6 Ra4 3.Qc6 Ra3+ 4.Ke4
>					Ra2 5.f3 Ra5 6.f4 Ra3
>0:05	2/11	3.23	1085916		1.Qd6 Ra2 2.a6 Ra4 3.Qc6 Ra3+ 4.Ke4
>					Ra2 5.Qb7 Re2+ 6.Kf3 Ra2 7.a7 Ra3+
>					8.Ke4 Ra4+ 9.Kd5
>0:12	3/12	3.23	2601315		1.Qd6 Ra2 2.a6 Ra4 3.Qc6 Ra3+ 4.Ke4
>					Ra2 5.Qb7 Ra4+ 6.Kd5 Rd4+ 7.Kc6
>					Rd2 8.f3 Rd8
>0:22	3/12	4.08	4907444		1.Qxb2 Bxb2 2.Ke4 Ba3 3.Kd5 Bb4
>					4.a6 Be1 5.a7 Bxf2 6.a8=Q Bxg3
>					7.Qa1+ f6 8.Qa7+ Kg8
>0:23	4/13	4.19	5181445		1.Qxb2 Bxb2 2.Ke4 Ba3 3.Kd5 Bb4
>					4.a6 Be1 5.a7 Bxf2 6.a8=Q Bxg3
>					7.Qd8 f5 8.Qe7+ Kg8
>0:31	5/14	4.17	7486875		1.Qxb2 Bxb2 2.Ke4 f5+ 3.Kd5 Bc3
>					4.a6 Be1 5.a7 Bxf2 6.a8=Q Bxg3
>					7.Qb7+ Kf6 8.Qc6+ Kf7 9.Qe6+ Kg7
>					10.Qe7+ Kg8 11.Qf6 Kh7
>0:57	6/15	4.38	13861181	1.Qxb2 Bxb2 2.Ke4 f5+ 3.Kd5 Bc3
>					4.a6 Be1 5.a7 Bxf2 6.a8=Q Bxg3
>					7.Qb7+ Kh6 8.Qe7 f4 9.Qg5+ Kg7
>					10.Ke4 Kf7 11.Qd5+ Kg7
>5:05	6/15	4.79	75338035	1.Qd6 Ra2 2.a6 Ra4 3.Kg2 Bd4 4.Qf4
>					Kg8 5.a7 Rxa7 6.Qxd4 Ra3 7.Qd7
>					Ra2 8.Kf3 Rb2
>
>jm

Pocket Chess Genius 1.5
Dell Axim 400
oc to 600 Mhz
16 MB Hash
Rom A05
Wm 2003

finds Qxb2 in 35 seconds on the 11 ply w/ +4 score

averaging about 93k nps



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Last modified: Thu, 15 Apr 21 08:11:13 -0700

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