Author: Dann Corbit
Date: 11:57:24 05/27/02
Go up one level in this thread
On May 27, 2002 at 14:31:16, Bo Sjögren wrote:
>Many years ago I was outplayed for most of the game, but my opponent
>allowed me to "close the shop":
>
>[D]8/p7/6kp/1p2p3/1P2P2P/2P5/1P3K2/8 w - -
>
>White must play 1.h5+!, which I think we concluded after the game wins
>rather easily. But instead he played 1. b3?? and after 1...h5! he
>thought for five minutes, and shook his head (and my hand)...
>
>Does the current crop of engines recognise the danger? It seems CT14
>prefers 1.h5+, but is almost as happy with 1.b3 -- just a one minute
>check. Will any engine conclude that 1.b3 is indeed a draw, and how
>will it do it; by some kind of intelligence, or brute force? (I of
>course have the feeling that brute force is not enough for this type
>of problem.)
>
Crafty:
EPD Kit revision date: 1996.04.21
unable to open book file [e:\crafty\release/books.bin].
hash table memory = 48M bytes.
pawn hash table memory = 6M bytes.
EGTB cache memory = 32M bytes.
draw score set to 0.00 pawns.
choose from book moves randomly (using weights.)
choose from 5 best moves.
book learning enabled
result learning enabled
position learning enabled
threshold set to 9 pawns.
5 piece tablebase files found
19045kb of RAM used for TB indices and decompression tables
Crafty v18.15
White(1): st 999
search time set to 999.00.
White(1): hash 300M
hash table memory = 192M bytes.
White(1): epdpfga \1.epd 1.out
PFGA: EPD record: 1
end-game phase
clearing hash tables
time surplus 0.00 time limit 16:39 (16:39)
nss depth time score variation (1)
11-> 0.21 2.47 1. b3 h5 2. c4 Kf6 3. c5 Ke6 4. Ke3
Kd7 5. Kd3 Kc6 6. Ke3 <HT>
12 0.24 2.47 1. b3 h5 2. c4 Kf6 3. c5 Ke6 4. Ke3
Kd7 5. Kd3 Kc7 6. Ke3 Kc6
12-> 0.33 2.47 1. b3 h5 2. c4 Kf6 3. c5 Ke6 4. Ke3
Kd7 5. Kd3 Kc7 6. Ke3 Kc6
13 0.41 2.47 1. b3 h5 2. c4 Kf6 3. Ke3 Ke6 4. Kf3
Kd7 5. Ke2 Kc6 6. Kd3 Kb6 7. c5+ Kc6
13-> 0.55 2.47 1. b3 h5 2. c4 Kf6 3. Ke3 Ke6 4. Kf3
Kd7 5. Ke2 Kc6 6. Kd3 Kb6 7. c5+ Kc6
14 0.64 2.37 1. b3 h5 2. c4 Kf6 3. Ke3 Ke6 4. c5
Kd7 5. Kd3 Kc7 6. Kc2 Kd7 7. Kc3 Kc6
14-> 0.86 2.37 1. b3 h5 2. c4 Kf6 3. Ke3 Ke6 4. c5
Kd7 5. Kd3 Kc7 6. Kc2 Kd7 7. Kc3 Kc6
15 1.01 2.47 1. b3 h5 2. c4 Kf6 3. Ke3 Ke6 4. c5
Kd7 5. Kd3 Kc7 6. Kc2 Kd7 7. Kc3 Kc6
8. Kd3
15-> 1.22 2.47 1. b3 h5 2. c4 Kf6 3. Ke3 Ke6 4. c5
Kd7 5. Kd3 Kc7 6. Kc2 Kd7 7. Kc3 Kc6
8. Kd3
16 1.40 2.46 1. b3 h5 2. c4 Kf6 3. Ke3 Ke6 4. c5
Kd7 5. Kd3 Kc7 6. Kc2 Kd7 7. Kc3 a6
8. Kd2 Kc6
16-> 1.78 2.46 1. b3 h5 2. c4 Kf6 3. Ke3 Ke6 4. c5
Kd7 5. Kd3 Kc7 6. Kc2 Kd7 7. Kc3 a6
8. Kd2 Kc6
17 2.09 2.47 1. b3 h5 2. c4 Kf6 3. Ke3 Ke6 4. c5
Kd7 5. Kd3 Kc7 6. Kc2 Kd7 7. Kd1 Kc7
8. Ke2 Kc6 9. Ke3
17-> 2.60 2.47 1. b3 h5 2. c4 Kf6 3. Ke3 Ke6 4. c5
Kd7 5. Kd3 Kc7 6. Kc2 Kd7 7. Kd1 Kc7
8. Ke2 Kc6 9. Ke3
18 2.94 2.47 1. b3 h5 2. c4 Kf6 3. Ke3 Ke6 4. c5
Kd7 5. Kd3 Kc7 6. Kc2 Kd7 7. Kd2 Kc6
8. Ke2 Kc7 9. Kd3 Kc6
18-> 9.36 2.47 1. b3 h5 2. c4 Kf6 3. Ke3 Ke6 4. c5
Kd7 5. Kd3 Kc7 6. Kc2 Kd7 7. Kd2 Kc6
8. Ke2 Kc7 9. Kd3 Kc6
19 9.58 2.47 1. b3 h5 2. c4 Kf6 3. Ke3 Ke6 4. c5
Kd7 5. Kd3 Kc7 6. Kc2 Kd7 7. Kd2 Kc6
8. Ke2 Kc7 9. Kf2 Kc6 10. Ke3
19-> 16.77 2.47 1. b3 h5 2. c4 Kf6 3. Ke3 Ke6 4. c5
Kd7 5. Kd3 Kc7 6. Kc2 Kd7 7. Kd2 Kc6
8. Ke2 Kc7 9. Kf2 Kc6 10. Ke3
20 17.10 2.39 1. b3 h5 2. c4 Kf6 3. Ke3 Ke6 4. c5
Kd7 5. Kd3 Kc7 6. Kc2 Kd7 7. Kd2 Kc6
8. Ke2 Kc7 9. Ke1 Kc6 10. Kd2 a5
20 24.93 2.63 1. h5+ Kg5 2. Ke3 Kf6 3. Kf3 Ke6 4.
Kg4 Kf6 5. Kh4 Ke6 6. b3 Ke7 7. c4
Kd7 8. Kh3 Ke6 9. Kg4 Kf6 10. c5 Ke6
11. Kf3
20-> 25.98 2.63 1. h5+ Kg5 2. Ke3 Kf6 3. Kf3 Ke6 4.
Kg4 Kf6 5. Kh4 Ke6 6. b3 Ke7 7. c4
Kd7 8. Kh3 Ke6 9. Kg4 Kf6 10. c5 Ke6
11. Kf3
21 32.02 2.63 1. h5+ Kg5 2. Ke3 Kf6 3. Kf3 Ke6 4.
Kg4 Kf6 5. Kh4 Ke6 6. b3 Ke7 7. c4
Kd7 8. Kh3 Ke6 9. Kg4 Kf6 10. Kf3 Ke7
11. c5 Ke6
21-> 34.17 2.63 1. h5+ Kg5 2. Ke3 Kf6 3. Kf3 Ke6 4.
Kg4 Kf6 5. Kh4 Ke6 6. b3 Ke7 7. c4
Kd7 8. Kh3 Ke6 9. Kg4 Kf6 10. Kf3 Ke7
11. c5 Ke6
22 48.16 2.64 1. h5+ Kg5 2. Kf3 Kf6 3. b3 Ke6 4.
Kg4 Kf6 5. c4 Ke6 6. c5 Kf6 7. c6 Ke6
8. c7 Kd7 9. Kf5 Kxc7 10. Kxe5 Kc6
11. Kf6 Kd6 12. e5+ Kd5 13. e6
22-> 51.74 2.64 1. h5+ Kg5 2. Kf3 Kf6 3. b3 Ke6 4.
Kg4 Kf6 5. c4 Ke6 6. c5 Kf6 7. c6 Ke6
8. c7 Kd7 9. Kf5 Kxc7 10. Kxe5 Kc6
11. Kf6 Kd6 12. e5+ Kd5 13. e6
23 1:02 ++ 1. h5+!!
23 4:33 8.35 1. h5+ Kxh5 2. b3 Kg5 3. c4 Kf6 4.
Kg2 Kg5 5. Kh3 Kf4 6. c5 Kxe4 7. c6
Kd3 8. c7 Kc3 9. c8=Q+ Kxb4 10. Qa6
e4 11. Qxa7 Kxb3 12. Qe3+ Ka2 13. Qe2+
<HT>
23-> 4:35 8.35 1. h5+ Kxh5 2. b3 Kg5 3. c4 Kf6 4.
Kg2 Kg5 5. Kh3 Kf4 6. c5 Kxe4 7. c6
Kd3 8. c7 Kc3 9. c8=Q+ Kxb4 10. Qa6
e4 11. Qxa7 Kxb3 12. Qe3+ Ka2 13. Qe2+
<HT>
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