Author: Enrique Irazoqui
Date: 13:10:48 06/21/00
Go up one level in this thread
On June 21, 2000 at 15:37:49, Steffen Jakob wrote:
>On June 21, 2000 at 08:30:59, Enrique Irazoqui wrote:
>
>>[D]1r6/1pb1k1p1/4p2p/1p1p4/3Pp2P/1R2P1PB/1P2P1K1/8 b - - 0 1
>>
>>Yesterday I looked at this position that reveals once again how much trouble
>>programs have in recognizing the importance of blocked pieces. Some programs
>>pick and drop 1...b4, but none of them realize that the blocked rook is out of
>>the game until the search makes them see the consequences many hours later. The
>>evaluation at the initial position or after 1...b4 2.Rxb4 b5 3.Rb3 b4 is almost
>>the same. It takes 61 minutes for F6a and 335 minutes for Tiger to pick b4, and
>>much, much longer to fail high.
>>
>>[Event "Biel"]
>>[Site "?"]
>>[Date "1977.??.??"]
>>[Round "?"]
>>[White "Andersson"]
>>[Black "Torre"]
>>[Result "0-1"]
>>[SetUp "1"]
>>[FEN "1r6/1pb1k1p1/4p2p/1p1p4/3Pp2P/1R2P1PB/1P2P1K1/8 b - - 0 1"]
>>[PlyCount "7"]
>>[EventDate "1997.??.??"]
>>
>>1... b4 $3 2. Rxb4 b5 $1 3. h5 (3. Rb3 b4 {
>>/\...Bd6, Re8 (>< e6), Kd8-c7-...-c4 -+; >< g3}) 3... Bd6 4. Rb3 b4 $1 $19 {
>>>< Rb3, g3; /\ 5...Re8 (>< e6), 6... Kd8-c7-...-c4 -+ Andersson-Torre/Biel1977}
>>0-1
>>
>>n-Torre/Biel1977}
>>0-1
>
>Hossa knows about paralyzed rooks and queens and therefore he finds the solution
>- even for the right reason. Unfortunately my current infrastructure is not very
>good for this eval features and this is one of the reasons why my program is
>rather slow. I really hope that my rewrite will speed up especially the
>queen/rook evaluation dramatically. :-)
>
> +---+---+---+---+---+---+---+---+
>8 | |=R=| | | | | | |
> +---+---+---+---+---+---+---+---+ Black: Hossa v1.81 (C) (0)
>7 | |=P=|=B=| |=K=| |=P=| |
> +---+---+---+---+---+---+---+---+ Black material: 15.31
>6 | | | | |=P=| | |=P=|
> +---+---+---+---+---+---+---+---+
>5 | |=P=| |=P=| | | | |
> +---+---+---+---+---+---+---+---+ Black to move
>4 | | | | P |=P=| | | P |
> +---+---+---+---+---+---+---+---+
>3 | | R | | | P | | P | B |
> +---+---+---+---+---+---+---+---+ White material: 14.31
>2 | | P | | | P | | K | |
> +---+---+---+---+---+---+---+---+ White: opponent (0)
>1 | | | | | | | | |
> +---+---+---+---+---+---+---+---+
> a b c d e f g h
>
> depth value time nodes pv
> 1 0.17 0.00 3 1... b8a8 2.b3xb5
> 2/1 0.26 0.00 7 1... c7d6 2.b3xb5
> <1> 0.26 0.00 64 1... c7d6 2.b3xb5
> 2 0.26 0.01 85 1... c7d6 2.b3xb5
> <2> 0.26 0.01 192 1... c7d6 2.b3xb5
> 3 0.38 0.01 316 1... c7d6 2.b3xb5 g6
> <3> 0.38 0.03 1117 1... c7d6 2.b3xb5 g6
> 4 0.08 0.04 1386 1... c7d6 2.b3xb5 g6 3.b5a5
> 2/4 0.09 0.05 1793 1... b8a8 2.b3xb5 b6 3.g2f2
> 3/4 0.21 0.06 2200 1... b8f8 2.b3xb5 b6 3.b5b3
> <4> 0.21 0.10 4435 1... b8f8 2.b3xb5 b6 3.b5b3
> 5 0.37 0.13 6109 1... b8f8 2.b3xb5 b6 3.h3g4 g6
> 9/5 0.47 0.19 9095 1... c7a5 2.b3xb5 a5d2 3.g2f2 b8f8
> 4.f2g2
> <5> 0.47 0.21 10512 1... c7a5 2.b3xb5 a5d2 3.g2f2 b8f8
> 4.f2g2
> 6 0.27 0.24 12548 1... c7a5 2.b3xb5 a5d2 3.b5b6 d2xe3
> 4.b6xe6 e7f7
> <6> 0.27 0.46 25559 1... c7a5 2.b3xb5 a5d2 3.b5b6 d2xe3
> 4.b6xe6 e7f7
> 7 0.50 0.53 30529 1... c7a5 2.b3xb5 a5d2 3.g2f2 g6
> 4.b5b6 b8f8 5.f2g2
> <7> 0.50 0.84 53261 1... c7a5 2.b3xb5 a5d2 3.g2f2 g6
> 4.b5b6 b8f8 5.f2g2
> 8 0.23 1.06 67973 1... c7a5 2.b3xb5 a5d2 3.b5b3 g6
> 4.b3a3 b8f8 5.h3g4
>! 2/8 0.95 1.65 106338 1... b4 2.b3xb4 b5 3.h3g4 c7d6
> 4.b4b3 b4 5.g2f2
>! <8> 0.95 1.67 108356 1... b4 2.b3xb4 b5 3.h3g4 c7d6
> 4.b4b3 b4 5.g2f2
> 9 1.22 1.96 129285 1... b4 2.b3xb4 b5 3.h3g4 c7d6
> 4.b4b3 b4 5.g2h3 b8f8
> <9> 1.22 2.04 135598 1... b4 2.b3xb4 b5 3.h3g4 c7d6
> 4.b4b3 b4 5.g2h3 b8f8
>
>Best wishes,
>Steffen.
Did Hossa pick b4 in 1.65 minutes or seconds? In any case, it sees the line and
is the program that does best in this position, by far. Congratulations.
Enrique
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