Author: Michael Fuhrmann
Date: 00:32:39 03/08/02
Go up one level in this thread
On March 07, 2002 at 22:54:00, Robert Hyatt wrote:
>On March 07, 2002 at 22:00:56, Michael Fuhrmann wrote:
>
>>Crafty, playing without tablebases, likes the suicidal move Bxe3 in this
>>position. A flaw in its endgame knowledge?
>>
>>[D] 8/8/2k3P1/8/3b4/4R3/8/n4K2 b - - 0 56
>
>
>Do you have something broken? Mine finds Bxe3 at ply=1, but at ply=2 it
>fails low to something winning for white and it changes to Kc5 and sticks
>with it forever...
>
>I can't reproduce Bxe3 beyond a 1 ply search and wouldn't expect to be able
>to do so as it is a trivial losing move that the search will pick up instantly.
>
>Which version?
latest version. here's log output from analysis, which I did after crafty played
the move in a game vs yace::
hash table memory = 24M bytes.
pawn hash table memory = 6M bytes.
threshold set to 6 pawns.
Crafty v18.13
White(1): analyze
clearing hash tables
book moves {e4, d4, c4, f4}
book 0.0s 7% c4! Nf6
in yc.fen
book moves {e4, d4, c4, f4}
book 0.0s 33% d4! Nf6
8/8/2k3P1/8/3b4/4R3/8/n4K2 b - - 0 56
+---+---+---+---+---+---+---+---+
8 | | | | | | | | |
+---+---+---+---+---+---+---+---+
7 | | | | | | | | |
+---+---+---+---+---+---+---+---+
6 | | | *K| | | | P | |
+---+---+---+---+---+---+---+---+
5 | | | | | | | | |
+---+---+---+---+---+---+---+---+
4 | | | | *B| | | | |
+---+---+---+---+---+---+---+---+
3 | | | | | R | | | |
+---+---+---+---+---+---+---+---+
2 | | | | | | | | |
+---+---+---+---+---+---+---+---+
1 | *N| | | | | K | | |
+---+---+---+---+---+---+---+---+
a b c d e f g h
end-game phase
clearing hash tables
time surplus 0.00 time limit 30.00 (3:30)
nss depth time score variation (1)
7 0.41 -- 1. ... Nc2
7 0.51 5.14 1. ... Nc2 2. Re4 Bg7 3. Rc4+ Kd5 4.
Rxc2 Ke4 5. Kf2
7 0.76 3.95 1. ... Kb7 2. g7 Bxg7 3. Re7+ Kc6 4.
Rxg7 Kd6 5. Kf2 Nc2
7 0.86 3.50 1. ... Kb5 2. Re7 Bc5 3. g7 Bxe7 4.
g8=Q Kc5 5. Ke2
7 0.90 3.30 1. ... Kc5 2. Re7 Kd6 3. g7 Kxe7 4.
g8=Q Bb2 5. Kf2
7-> 0.97 3.30 1. ... Kc5 2. Re7 Kd6 3. g7 Kxe7 4.
g8=Q Bb2 5. Kf2
8 1.07 3.35 1. ... Kc5 2. Re7 Kd6 3. g7 Kxe7 4.
g8=Q Bb2 5. Qh7+ Kd6 6. Kf2
8-> 1.38 3.35 1. ... Kc5 2. Re7 Kd6 3. g7 Kxe7 4.
g8=Q Bb2 5. Qh7+ Kd6 6. Kf2
9 1.47 3.35 1. ... Kc5 2. Re7 Kd6 3. g7 Kxe7 4.
g8=Q Bb2 5. Qh7+ Kd6 6. Kf2 Bc3
9-> 1.86 3.35 1. ... Kc5 2. Re7 Kd6 3. g7 Kxe7 4.
g8=Q Bb2 5. Qh7+ Kd6 6. Kf2 Bc3
10 2.29 -- 1. ... Kc5
10 5.43 3.80 1. ... Kc5 2. Re7 Kd6 3. Rh7 Ke6 4.
Rb7 Nc2 5. g7 Bxg7 6. Rxg7 Nb4
10 7.18 3.55 1. ... Bxe3 2. g7 Bd4 3. g8=Q Kd6 4.
Qd8+ Ke5 5. Ke2 Ke4 6. Qc8 Kd5 7. Kd3
10-> 7.79 3.55 1. ... Bxe3 2. g7 Bd4 3. g8=Q Kd6 4.
Qd8+ Ke5 5. Ke2 Ke4 6. Qc8 Kd5 7. Kd3
11 8.27 3.65 1. ... Bxe3 2. g7 Bd4 3. g8=Q Kd6 4.
Ke2 Bf6 5. Kd3 Be5 6. Qb8+ Kd5 7. Qd8+
Kc5 8. Ke4
11-> 10.19 3.65 1. ... Bxe3 2. g7 Bd4 3. g8=Q Kd6 4.
Ke2 Bf6 5. Kd3 Be5 6. Qb8+ Kd5 7. Qd8+
Kc5 8. Ke4
12 10.83 3.65 1. ... Bxe3 2. g7 Bd4 3. g8=Q Kd6 4.
Ke2 Bf6 5. Kd3 Be5 6. Qb8+ Kd5 7. Qd8+
Kc5 8. Ke4 Bb2
12-> 13.32 3.65 1. ... Bxe3 2. g7 Bd4 3. g8=Q Kd6 4.
Ke2 Bf6 5. Kd3 Be5 6. Qb8+ Kd5 7. Qd8+
Kc5 8. Ke4 Bb2
13 16.13 3.65 1. ... Bxe3 2. g7 Bd4 3. g8=Q Kc5 4.
Qd8 Kc4 5. Ke2 Be5 6. Qd3+ Kc5 7. Ke3
Bb2 8. Qf5+ Kc4 9. Ke4
13-> 20.40 3.65 1. ... Bxe3 2. g7 Bd4 3. g8=Q Kc5 4.
Qd8 Kc4 5. Ke2 Be5 6. Qd3+ Kc5 7. Ke3
Bb2 8. Qf5+ Kc4 9. Ke4
14 31.98 -- 1. ... Bxe3
14 37.96 4.08 1. ... Bxe3 2. g7 Bd4 3. g8=Q Kc5 4.
Ke2 Kb4 5. Kd3 Nb3 6. Qc4+ Ka3 7. Kc2
Na1+ 8. Kb1 Nb3 9. Qb5 Nd2+ 10. Kc2
14-> 1:57 4.08 1. ... Bxe3 2. g7 Bd4 3. g8=Q Kc5 4.
Ke2 Kb4 5. Kd3 Nb3 6. Qc4+ Ka3 7. Kc2
Na1+ 8. Kb1 Nb3 9. Qb5 Nd2+ 10. Kc2
15 2:08 4.08 1. ... Bxe3 2. g7 Bd4 3. g8=Q Kc5 4.
Ke2 Kb4 5. Kd3 Nb3 6. Qc4+ Ka3 7. Kc2
Na1+ 8. Kb1 Nb3 9. Qb5 Nd2+ 10. Kc2
Nf3
15-> 2:35 4.08 1. ... Bxe3 2. g7 Bd4 3. g8=Q Kc5 4.
Ke2 Kb4 5. Kd3 Nb3 6. Qc4+ Ka3 7. Kc2
Na1+ 8. Kb1 Nb3 9. Qb5 Nd2+ 10. Kc2
Nf3
16 3:43 -- 1. ... Bxe3
Black(0): quit
execution complete.
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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