Author: Pete Galati
Date: 16:08:48 02/17/01
Go up one level in this thread
On February 17, 2001 at 08:10:24, leonid wrote:
>Hi!
>
>If you like to solve the mate that is apperently easy but still contain some
>challenge then try the next one:
>
>[D]R3Nnrk/1Q3bqq/3QnQ1r/1Q4bn/4Q1qN/2Q2nQ1/Q2BB3/1Q1K3R w - -
>
>Please, indicate your result.
>
>I hope that your brute force search will be more successful that mine. Mine went
>this way:
>
>LLchess mate solver. AMD 400Mhz. No hash.
>
>3 moves - 1.4 sec.
>4 moves - 20.7 sec.
>5 moves - 8 min. 23 sec.
>
>My chances to solve by brute force, after those numbers, looke not very bright.
>Even solution by selective took 25 sec. I hope your program will do better.
>
>Initial number of white moves is 152.
>
>Thanks,
>Leonid.
Here's what Crafty did with it. I've started having Crafty read your positions
from a file now rather than paste them in like I was doing before.
I let Crafty work on this for a while to see if it could come up with anything
better than mate in 8, but it didn't happen.
Pete
5 piece tablebase files found
1836kb of RAM used for TB indices and decompression tables
EGTB cache memory = 3M bytes.
hash table memory = 48M bytes.
pawn hash table memory = 5M bytes.
Crafty v18.3
White(1): epdlrec new.epd 2
White(1): d
White(1): analyze
middle-game phase
clearing hash tables
time surplus 0.00 time limit 30.00 (3:30)
nss depth time score variation (1)
2-> 0.77 51.40 1. Qgxg4 Nxf6 2. Qxh7+ N8xh7 3. Nxg7
Nxg4 4. Qxf7
3 1.00 51.40 1. Qgxg4 Nxf6 2. Qxh7+ N8xh7 3. Nxg7
Nxg4 4. Qxf7
3-> 1.99 51.40 1. Qgxg4 Nxf6 2. Qxh7+ N8xh7 3. Nxg7
Nxg4 4. Qxf7
4 2.26 51.40 1. Qgxg4 Nxf6 2. Qxh7+ N8xh7 3. Nxg7
Nxg4 4. Qxf7
4-> 4.04 51.40 1. Qgxg4 Nxf6 2. Qxh7+ N8xh7 3. Nxg7
Nxg4 4. Qxf7
5 4.62 51.40 1. Qgxg4 Nxf6 2. Qxh7+ N8xh7 3. Nxg7
Nxg4 4. Qxf7
5 4.77 ++ 1. Qxh7+!!
5 5.55 54.40 1. Qxh7+ Rxh7 2. Qxg7+ Nhxg7 3. Qxg4
Nxd2 4. Q1f5
5-> 8.05 54.40 1. Qxh7+ Rxh7 2. Qxg7+ Nhxg7 3. Qxg4
Nxd2 4. Q1f5
6 9.94 ++ 1. Qxh7+!!
6 11.11 57.40 1. Qxh7+ Rxh7 2. Qfxf7 Ne5 3. Nxg7
Nxf7 4. Nxh5+ Ng7 5. Bxg4 Nxd6 6. Qxd6
6-> 25.35 57.40 1. Qxh7+ Rxh7 2. Qfxf7 Ne5 3. Nxg7
Nxf7 4. Nxh5+ Ng7 5. Bxg4 Nxd6 6. Qxd6
7 26.07 ++ 1. Qxh7+!!
7 35.20 60.40 1. Qxh7+ Rxh7 2. Qfxf7 Ne5 3. Nxg7
Nxf7 4. Ng6+ Nxg6 5. Rxg8+ Kxg8 6.
Qe8+ Nef8 7. Qexf7+ Kh8 8. Qxg4
7-> 40.17 60.40 1. Qxh7+ Rxh7 2. Qfxf7 Ne5 3. Nxg7
Nxf7 4. Ng6+ Nxg6 5. Rxg8+ Kxg8 6.
Qe8+ Nef8 7. Qexf7+ Kh8 8. Qxg4
8 43.11 ++ 1. Qxh7+!!
8 2:27 Mat08 1. Qxh7+ Nxh7 2. Qxg7+ Nhxg7 3. Qxf7
Qa4+ 4. Qbxa4 Nfd4 5. Ng6+ Rxg6 6.
Rxh7+ Kxh7 7. Qfxg6+ Kh8 8. Qh7#
8-> 2:51 Mat08 1. Qxh7+ Nxh7 2. Qxg7+ Nhxg7 3. Qxf7
Qa4+ 4. Qbxa4 Nfd4 5. Ng6+ Rxg6 6.
Rxh7+ Kxh7 7. Qfxg6+ Kh8 8. Qh7#
9 7:39 Mat08 1. Qxh7+ Nxh7 2. Qxg7+ Nhxg7 3. Qxf7
Qa4+ 4. Qbxa4 Nfd4 5. Ng6+ Rxg6 6.
Rxh7+ Kxh7 7. Qfxg6+ Kh8 8. Qh7#
9-> 13:30 Mat08 1. Qxh7+ Nxh7 2. Qxg7+ Nhxg7 3. Qxf7
Qa4+ 4. Qbxa4 Nfd4 5. Ng6+ Rxg6 6.
Rxh7+ Kxh7 7. Qfxg6+ Kh8 8. Qh7#
White(1): exit
White(1): q
execution complete.
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