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Subject: Re: Draw due to lack of blockade detection...

Author: Terry Ripple

Date: 08:19:26 10/04/02

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On October 04, 2002 at 11:14:42, John Merlino wrote:

>On October 04, 2002 at 11:06:36, Omid David wrote:
>
>>On October 04, 2002 at 10:51:27, Sune Fischer wrote:
>>
>>>On October 04, 2002 at 10:34:43, Omid David wrote:
>>>
>>>>Just today we had a discussion regarding the importance of blockade draw
>>>>detections http://www.talkchess.com/forums/1/message.html?255950
>>>>
>>>>Had Fritz implemented such a scheme, it wouldn't have stepped into the drawing
>>>>variation.
>>>
>>>Yeah, throwing away a winning chance like that is pathetic. What good does it do
>>>to search 3.5 kNps, reach depth 21 and be a masterful tactician when you are
>>>_blind_ to such obvious "positional" tricks. It's back to the old drawing board
>>>for team Fritz, tsk tsk tsk.
>>>
>>>>My engine instantly announced draw based on its blocked-draw detection
>>>>heuristic. While Fritz never realized the draw...
>>>
>>>Nice, looks like the next generation of chess programmers are going to make
>>>things a little harder for the GMs :)
>>>
>>>How far back does it see the draw, far enough to avoid it, what other moves does
>>>it suggest?
>>
>>[D]3k4/2p1b3/1p2p1p1/p1p1P2p/P1P3P1/1P5P/5P2/2B3K1 w - - 0 25
>>
>>After 25.h4, my engine shouted "draw"...
>
>Chessmaster 9000, on a P3-733, never considers h4, and switches from Bd2 to f4
>after 1:31....
>
>Time	Depth	Score	Positions	Moves
>0:00	1/7	0.33	12344		25.f4 Bh4 26.Bd2 Kd7 27.Kg2 Kc6
>					28.Kf3
>0:00	2/8	0.40	26738		25.f4 Kd7 26.Kf2 Bh4+ 27.Kf3 Be1
>					28.Ke4 Bc3 29.Be3
>0:00	2/8	0.41	29539		25.Bd2 Kd7 26.f4 Bh4 27.Kg2 Kc6
>					28.Kf3 hxg4+ 29.hxg4
>0:00	3/9	0.46	56907		25.Bd2 Kd7 26.f4 Kc6 27.Kg2 Bd8
>					28.Kf3 Bh4 29.Ke4
>0:01	4/10	0.49	101459		25.Bd2 Kd7 26.f4 Kc6 27.Kg2 Bd8
>					28.Kf3 Bh4 29.Ke4 Bf2
>0:02	5/11	0.47	205458		25.Bd2 Kd7 26.f4 Kc6 27.Kg2 Bd8
>					28.Kf3 Bh4 29.Ke4 Bf2 30.f5 gxf5+
>					31.gxf5
>0:04	6/12	0.49	500577		25.Bd2 Kd7 26.f4 Kc6 27.Kg2 Bd8
>					28.Kf3 Bh4 29.Ke4 Bf2 30.Bc3 Bh4
>0:12	7/13	0.49	1335584		25.Bd2 Kd7 26.f4 c6 27.Kf2 Bh4+
>					28.Kf3 Kc7 29.Ke4 Kd7 30.f5 gxf5+
>					31.gxf5 exf5+ 32.Kxf5 Ke7 33.Be3
>0:29	8/14	0.54	3194955		25.Bd2 Kd7 26.f4 c6 27.Kf2 Bh4+
>					28.Kf3 Ke8 29.Be3 Kf7 30.Bf2 hxg4+
>					31.hxg4 g5 32.Bg3 Bxg3 33.Kxg3
>1:06	9/15	0.53	7332378		25.Bd2 Kd7 26.f4 Bh4 27.Kg2 Ke8
>					28.Kf3 Kf7 29.Ke4 Ke7 30.Be3 Ke8
>					31.gxh5 gxh5 32.f5 exf5+ 33.Kxf5
>					Ke7
>1:31	9/15	0.58	9979645		25.f4 Kd7 26.Kf2 Bh4+ 27.Kf3 hxg4+
>					28.hxg4 Be1 29.Ke4 Ke7 30.Ke3 Bc3
>					31.Bd2 Bb2 32.Ke4 Kd7 33.Be3 Bc3
>2:17	10/16	0.58	15125976	25.f4 Kd7 26.Kf2 Bh4+ 27.Kf3 hxg4+
>					28.hxg4 Be1 29.Ke4 Ke7 30.Ke3 Bc3
>					31.Bd2 Bb2 32.Ke4 Kd7 33.Be3 Bc3
>4:36	11/17	0.68	30153637	25.f4 Kd7 26.Kf2 hxg4 27.hxg4 Ke8
>					28.Kf3 Bf8 29.Ke4 Bh6 30.Bd2 Ke7
>					31.Be1 Bg7 32.Bh4+ Kd7 33.Bf2 c6
>					34.Be3
>
>jm
-----------------
Hi jm,
Larry Christiansen talked about the support of the pawns by the push of f4!

Terry



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