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Subject: Re: Spike-Rybka

Author: Vasik Rajlich

Date: 03:05:22 12/29/05

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On December 28, 2005 at 16:07:00, Eelco de Groot wrote:

>Hello Vasik,
>
>Being just a weak 1300 clubplayer, I think I nevertheless would agree with you
>that White is better and I would not like to have to play with the black pieces
>in this position. The main characteristic of the position seems to me that Black
>has very few plausible moves (even looking superficially) and White has many? If
>you had some sort of static evaluator that could count the number of
>superficially plausible moves somehow, that would give White a headstart here.
>No idea if that could be constructed though in a static eval but with a 1 ply
>search plus qsearch it would be different already? For Black I see only
>plausible moves Qg5, Qh5, Rh6 (backward Rookmoves should maybe get a penalty
>unless they attack something or defend an attacked piece, in this case the Rh6
>defends f6 but the pawn is already well protected. The black bishops can go to
>the backrank but maybe that also should not count, unless there they attack
>something or defend something that needs defending. pawn e6 can go forward to
>e5, but that gives up two very important fields on d5 and f5 for the the White
>Knight on e3. Practically every other Black move loses the piece or creates a
>double pawn after Queen exchange etc.
>
>I could do some sort of similar calculation for White but I think it is obvious
>that White has many more plausible choices for every single piece. Even if you
>discount moves backward for pieces other than Knights, every piece from White
>can still move. Well, you asked for some "static" evaluation of the position, I
>tried to give one. But I don't know if it is possible to implement such a
>"plausible mobility" evaluator...
>
> Best Regards,
> Eelco

I think it's a question of the potential of the position. Black is optically
pretty good, but the question is what's next. It's not easy to figure this out,
for humans or computers ..

Vas

>
>[D]8/1b2b1k1/pp1ppp2/nPq5/P1P1P3/2QRNPP1/8/1N2KB1r b - - 0 1
>
>Pro Deo 1.1 Vulcan sees only an equal position, 0.13 for Black:
>
>00:00:00.2	-0,43	1	448	axb5 cxb5
>00:00:00.3	0,90	1	450	Rh2
>00:00:00.3	-0,48	2	873	Rh2 Bg2
>00:00:00.3	-0,15	2	1827	Kg8 Kd1
>00:00:00.3	-0,13	2	3583	Qg5 Ng4
>00:00:00.3	0,51	3	5748	Qg5 Kd1 Qxg3
>00:00:00.3	0,51	4	9247	Qg5 Kd1 Qxg3
>00:00:00.3	0,55	5	20287	Qg5 Kd1 Qxg3 Nd2
>00:00:00.4	0,82	6	76759	Qg5 Qc2 Qxg3+ Qf2 Qh3 bxa6
>00:00:00.6	0,38	7	287769	Qg5 g4 Qh4+ Kd1 Qf2 Nd2 Kf8
>00:00:00.7	0,43	8	505674	Qg5 g4 Qh4+ Kd1 Qf2 Nd2 Kf8 Rd4
>00:00:01.7	0,14	9	1492438	Qg5 g4 Qf4 Qd2 Kg8 Qe2 axb5 cxb5 Rh2
>00:00:05.4	0,08	10	5722665	Qg5 g4 Qh4+ Kd1 Qf2 Nd2 Kf8 Qd4 axb5 cxb5
>00:00:13.4	0,08	11	14995976	Qg5 g4 Qf4 Nd2 axb5 cxb5 d5 exd5 Bb4 Qd4 Qg3+ Kd1
>00:00:43.8	0,01	12	50888700	Qg5 g4 Ba8 Kd1 Nb7 Rd2 Nc5 bxa6 Bc6 a7 Qf4 Kc1 Nxa4
>00:01:56.4	0,12	13	138173359	Qg5 g4 Ba8 Qb2
>00:03:58.5	0,10	14	288890040	Qg5 g4 Ba8 Qd2 Nb7 Nd1 Nc5 Qxg5+ fxg5
>00:13:22.2	0,16	15	982663119	Qg5 g4 Ba8 Qc2 Nb7 Qg2 Qh6 g5 fxg5 Ng4 Qh4+ Kd1
>00:47:24.2	0,13	16	3488705002	Qg5 g4 Ba8 Nd1



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