Author: Robert Hyatt
Date: 06:27:09 08/14/00
Go up one level in this thread
On August 13, 2000 at 16:47:33, Ed Schröder wrote:
>On August 13, 2000 at 05:23:42, Colin Frayn wrote:
>
>>On August 13, 2000 at 05:17:29, Colin Frayn wrote:
>>
>>>Take this position for example;
>>>
>>>[D]4Q3/2p3p1/7p/p1k1B3/2p1P2P/2P3P1/1r2q3/6K1 w - -
>>>
>>>which ColChess searches *fully* to depth 13 ply in just over 3 seconds on my
>>>p3-450. It is a mate in 9. Crafty sees the mate quite early because of its
>>>advanced extensions, but after 30 seconds had still only just reached 11 ply in
>>>its search. There are probably better examples where Crafty can't see the mate,
>>>and I unfortunately can't remember the board setup before this position, which I
>>>know to be one of them.
>>
>>OK I found the game. This is one position. Unfortunately Crafty again sees the
>>mate using its impressive extension code, but ColChess manages to search 18 full
>>ply *completely* plus seeing the mate immediately at 19 ply in 46.7 seconds.
>>After this time, Crafty has just started searching the 13th ply. See how Faile
>>does.
>>
>>[D]6Q1/2p3p1/5k1p/p3n3/2pBP2P/2P3P1/1r2q3/6K1 w - -
>>
>>Qf8+ is mate in 12.
>>
>>Cheers,
>>Col
>
>There are other (cheap) ways. Rebel handles these cases in Q-search.
>
>00:00:00 04.00 Mate in 12 moves 1.Qf8+ Ke6 2.Qe8+ Kd6 3.Bxe5+ Kc5
>
>Ed
This would make an interesting discussion. Here is my output on a pretty slow
PII/400 notebook:
nss depth time score variation (1)
1 0.00 -7.46 1. Qd5
1 0.01 ++ 1. Bxe5+!!
1 0.01 -6.07 1. Bxe5+ Kxe5 2. Qxg7+ Kxe4 3. Qxh6
1-> 0.02 -6.07 1. Bxe5+ Kxe5 2. Qxg7+ Kxe4 3. Qxh6
2 0.03 -6.02 1. Bxe5+ Kxe5 2. Qd5+ Kf6 3. Qf5+ Ke7
4. Qxa5 Qxe4 5. Qxc7+
2 0.03 ++ 1. Qf8+!!
2 0.04 -4.15 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Qxe5+
2-> 0.05 -4.15 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Qxe5+
3 0.05 ++ 1. Qf8+!!
3 0.06 -2.83 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Qxe5+ Kd7
4. Qxa5
3-> 0.09 -2.83 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Qxe5+ Kd7
4. Qxa5
4 0.09 ++ 1. Qf8+!!
4 0.11 0.00 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Be5+
4-> 0.14 0.00 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Be5+
5 0.17 0.00 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Be5+
5-> 0.23 0.00 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Be5+
6 0.29 0.00 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Be5+
6-> 0.42 0.00 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Be5+
7 0.57 0.00 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Be5+
7-> 0.81 0.00 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Be5+
8 1.25 0.00 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Be5+
8-> 1.73 0.00 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Be5+
9 1.93 ++ 1. Qf8+!!
9 2.60 Mat12 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Qd8+ Ke6 6. Qd5+ Ke7
7. Bc5+ Ke8 8. Qe6+ Kd8 9. Be7+ Ke8
10. Bf6+ Kf8 11. Qe7+ Kg8 12. Qxg7#
9-> 3.50 Mat12 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Qd8+ Ke6 6. Qd5+ Ke7
7. Bc5+ Ke8 8. Qe6+ Kd8 9. Be7+ Ke8
10. Bf6+ Kf8 11. Qe7+ Kg8 12. Qxg7#
10 5.00 Mat12 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Qd8+ Ke6 6. Qd5+ Ke7
7. Bc5+ Ke8 8. Qe6+ Kd8 9. Be7+ Ke8
10. Bf6+ Kf8 11. Qe7+ Kg8 12. Qxg7#
10-> 6.66 Mat12 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Qd8+ Ke6 6. Qd5+ Ke7
7. Bc5+ Ke8 8. Qe6+ Kd8 9. Be7+ Ke8
10. Bf6+ Kf8 11. Qe7+ Kg8 12. Qxg7#
11 9.88 Mat12 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Qd8+ Ke6 6. Qd5+ Ke7
7. Bc5+ Ke8 8. Qe6+ Kd8 9. Be7+ Ke8
10. Bf6+ Kf8 11. Qe7+ Kg8 12. Qxg7#
11-> 13.05 Mat12 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Qd8+ Ke6 6. Qd5+ Ke7
7. Bc5+ Ke8 8. Qe6+ Kd8 9. Be7+ Ke8
10. Bf6+ Kf8 11. Qe7+ Kg8 12. Qxg7#
12 20.79 Mat12 1. Qf8+ Ke6 2. Qe8+ Kd6 3. Bxe5+ Kc5
4. Bd4+ Kd6 5. Qd8+ Ke6 6. Qd5+ Ke7
7. Bc5+ Ke8 8. Qe6+ Kd8 9. Be7+ Ke8
10. Bf6+ Kf8 11. Qe7+ Kg8 12. Qxg7#
IE it takes me twice as much depth as you to see this, but 1/2 the time,
although I don't know what kind of hardware you are using. For comparison,
my quad xeon took .17 seconds...
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