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Subject: Re: Positional test position.

Author: Mike S.

Date: 17:53:51 02/10/02

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On February 10, 2002 at 19:58:24, Dan Andersson wrote:

>(...)
>[D]r2r2k1/pp1n1ppp/2bppq2/8/4PP2/2NB4/PPP3PP/3RQR1K w - - 0 16
>White has one really good plan. And it's a fairly unusual one for the Sicilian.
>16. b4 with the plan to dislodge the knight from protecting the e5 square. And
>black has oly one good reply 16... Nf8 to defend the king. 16... b6 is met by
>17. Bb5 and 16. a6 is roughly the same after 17. a4.

Yace 0.99.56 temporarily considers 1.b4, doesn't stick to it, but has black play
Nf8 too in another variation. I think the idea is Qe1-e3-h3, which also threats
e5 and Qxh7+. Later Yace thinks Black will defend that by 1...Qe7, allowing
f7-f5 if I get the idea right.

While I was writing this, Yace just re-issued 1.b4 after 8:46 on P3/700, 64 MB
hash. Astonishing! It seems to follow exactly your description (D=Q, S=N, L=B):

Engine: Yace 0.99.56
von Dieter Buerssner
Position:  0 16

  6.33	 0:00 	-0.01 	1.De2 b6 2.Lb5 Lxb5 3.Dxb5 a6 4.Dd3 (201.449) 245.6
  7.01	 0:01 	-0.02 	1.De2 Dd4 2.a3 Dc5 3.Df3 b6 4.Tf2 (449.254) 259.0
  7.33	 0:02 	-0.02 	1.De2 Dd4 2.a3 Dc5 3.Df3 b6 4.Tf2 (557.262) 264.4

(...)

  9.05	 0:16 	-0.04 	1.De3 b6 2.Le2 Sf8 3.a4 Dh4 4.Sb5 d5 5.e5 (4.945.044) 294.1
  9.19	 0:21 	-0.03++ 	1.b4 b6 2.Lb5 Lxb5 3.Sxb5 Tac8 4.Sxd6 Dxf4 5.Txf4 Txc2
(6.490.345) 295.9

(...)

 10.01	 0:28 	-0.02 	1.b4 a6 2.Le2 Sb6 3.Ld3 d5 4.e5 De7 5.a3 Sc4 (8.536.719)
298.4
 10.02	 0:43 	-0.01++ 	1.De3 b6 2.Dh3 Sf8 3.Dh5 Dg6 4.Dxg6 Sxg6 5.a3 a5
(13.165.677) 301.7

(...)

 12.01	 7:50 	+0.01 	1.De3 De7 2.Lb5 a6 3.Lxc6 bxc6 4.Dd4 Sf6 5.b3 (132.429.244)
281.4
 12.02	 8:46 	+0.02++ 	1.b4 a6 2.a4 b6 3.Lxa6 Txa6 4.b5 Lxb5 5.axb5 Ta3 6.Tf3 e5
7.Sd5 Kh8 (147.536.480) 280.0
 12.02	 9:29 	+0.16 	1.b4 a6 2.a4 Sf8 3.b5 axb5 4.axb5 Le8 5.e5 dxe5 6.fxe5 Dg5
7.De4 b6 (158.772.405) 278.7
 12.33	10:20 	+0.16 	1.b4 a6 2.a4 Sf8 3.b5 axb5 4.axb5 Le8 5.e5 dxe5 6.fxe5 Dg5
7.De4 b6 (172.045.977) 277.4
 13.01	12:13 	+0.16 	1.b4 a6 2.a4 Sf8 3.e5 dxe5 4.fxe5 Dg5 5.Df2 Dxe5 6.Dxf7+
Kh8 7.Sb1 Db2 8.Dh5 (202.603.004) 276.3


Regards,
M.Scheidl



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