Author: Steffen Jakob
Date: 12:37:49 06/21/00
Go up one level in this thread
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.
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