Author: Eelco de Groot
Date: 08:17:23 08/04/03
Go up one level in this thread
At ply 14 Rebel Betazoid now says f6+ is about –1.66. That is a little closer to
what you would like it to be but I think not enough? I would say because the
white pieces are bound to defend against the broken through pawn, Black’s king
has little to fear from them. The White King is practically immobilized by its
own pieces bound to the first rank, therefore the Black King can operate about
as strong as a light piece, White’s King not at all . But to be safe you could
give Black’s king about a value of a pawn more than the White king. White’s pawn
on f5 is about to fall with the Black king nearby so that leaves both sides
with three pawns, not counting the possibility that Black’s e-pawn might
actually promote unless White sacs a piece against it. Counting pieces White is
an exchange down in heavy material so that is another two pawns. Very
conservatively then Black is at least three pawns up, not counting the chances
of actually promoting the pawn on e3. That is worth at least another pawn. About
–4 then is what you would like to see for White. I know actually caculating this
with an evaluation routine is much more difficult but maybe not entirely
undoable? My five cents…
Eelco
[D]1r6/4kp2/8/5P2/1p5R/1P2p3/P2q2BP/6RK w - - 4 1
14 ply result for Rebel Betazoid:
04:18:57.1 -1,66 14 -858652986 f6+ Kxf6
The branching factor maybe looks not so good but here I also had Crafty
analyzing the position from within ECTool. That went okay, also now connected to
CCC, nothing crashing sofar!
I know Bob wrote about working on passers in the past so I’d thought I’d compare
the position.
Crafty 18.10, not the most recent, in analyze mode says:
9-> 1:36 -2.07 48. f6+ Kxf6 49. Rf4+ Ke6 50. Re4+
Kd7 51. Re5 Kc7 52. Bf3 Rf8 53. Rg7
Qf2
10 3:19 -2.19 48. f6+ Kxf6 49. Bf3 Kf5 50. Bg4+ Ke5
51. Rh5+ Kf6 52. Rf1+ Kg6 53. Re5 Rh8
54. h3 Rf8
10-> 4:43 -2.19 48. f6+ Kxf6 49. Bf3 Kf5 50. Bg4+ Ke5
51. Rh5+ Kf6 52. Rf1+ Kg6 53. Re5 Rh8
54. h3 Rf8
11 12:39 -2.32 48. f6+ Kxf6 49. Rf4+ Ke7 50. Bf3 Rh8
51. Rg2 Qe1+ 52. Rg1 Qf2 53. Re4+ Kf6
54. Rf4+ Ke5 55. Re4+ Kf5 56. Bg2 e2
57. Re7
11-> 16:54 -2.32 48. f6+ Kxf6 49. Rf4+ Ke7 50. Bf3 Rh8
51. Rg2 Qe1+ 52. Rg1 Qf2 53. Re4+ Kf6
54. Rf4+ Ke5 55. Re4+ Kf5 56. Bg2 e2
57. Re7
12 28:01 -2.35 48. f6+ Kxf6 49. Rf4+ Ke7 50. Bf3 Rc8
51. h4 f5 52. Rxf5 Rc2 53. Bg2 e2 54.
Re5+ Kf6 55. Re8 Rxa2
12-> 45:57 -2.35 48. f6+ Kxf6 49. Rf4+ Ke7 50. Bf3 Rc8
51. h4 f5 52. Rxf5 Rc2 53. Bg2 e2 54.
Re5+ Kf6 55. Re8 Rxa2
13 124:29 -2.21 48. f6+ Kxf6 49. Rf4+ Ke7 50. Bf3 Rc8
51. h4 Qxa2 52. Re4+ Kf8 53. Rxe3 Qf2
54. Rge1 Rc2 55. Re8+ Kg7 56. Rg1+
Kf6 57. Be4 Qxh4#
13 135:00 2/29? 48. Re4+
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