Author: Dann Corbit
Date: 14:22:17 08/10/00
Go up one level in this thread
On August 10, 2000 at 16:17:47, Christoph Fieberg wrote:
>Unbelievable, but true:
>I composed a position which is mate in 1 and can easily found, but Fritz6 on
>Pentium III, 500 Mhz and 32 MB Hash needs more than 1 hour to show it (excatly
>1:03:17)!!!
>How do other computers react?
>
>The position is
>FEN: 8/8/pppppppK/NBBR1NRp/nbbrqnrP/PPPPPPPk/8/Q7 w - - 0 1
>
>It is possible to reach this position from starting position:
>1.Sa3 Sa6 2.Sc4 Sc5 3.Sa5 Sa4 4.b3 b6 5.La3 La6 6.Lc5 Lc4 7.h4 h5 8.Th3 Th6
>9.Td3 Te6 10.Td5 Te4 11.Sh3 Sh6 12.e3 e6 13.Le2 Le7 14.Lf3 Lf6 15.d3 d6 16.Ke2
>Ke7 17.Dd2 Lc3 18.Te5 Lb4 19.Th1 Td4 20.Lc6 Dd7 21.Lb5 Th8 22.Td5 Kf6 23.Sg1 Sg4
>24.Th3 Se5 25.Tg3 Kf5 26.Tf3+ Kg4 27.Tf5 a6 28.g3 c6 29.Sf3 Kh3 30.Sg5+ Kh2
>31.Se4 Sg6 32.Kf3 Se5+ 33.Kf4 Sg6+ 34.Kg5 Se5 35.a3 Th6 36.c3 Tf6 37.De2 g6
>38.Kh6 Sg4+ 39.Kh7 De7 40.Tf4 Tf5 41.Sg5 Df6 42.Df3 De5 43.Kg8 De4 44.Sh3 Tg5
>45.Tf6 Sh6+ 46.Kh7 Sg4 47.Df5 Kg2 48.Kg7 Sh2 49.De5 Tg4 50.Sg5 Sf3 51.Sh7 Sg1
>52.Df4 [52.Tf5 Se2 53.Sf6 Sf4 54.Se8 Kh2 55.Tg5 Kg2 56.Kh7 Kh2 57.Sg7 Kg2 58.Sf5
>f6 59.f3 Kh2 60.Kh6 Kh3 Test it! What time do computers need to reach a certain
>search depths?] 52...Se2 53.Df3+ Kh2 54.Tff5 Sf4 55.Dd1 Kg2 56.Tg5 Kh2 57.Sf6
>Kg2 58.Sg8 Kh2 59.Se7 Kg2 60.Sf5 Kh2 61.Da1 Kg2 62.f3 f6 63.Kh6 Kh3 Mate in 1!
>(64. Dh1#). What time do different programms need to show it in the display? 1–0
>
>52.Tf5 leads to a position with White Queen on e5 (instead on a1).
>FEN: 8/8/pppppppK/NBBRQNRp/nbbrqnrP/PPPPPPPk/8/8 w - - 0 61
>
>How long do computers need to reach for example depth 9?
>Fritz 6 reached depth 5 after 9 hours!! (on Pentium III, 500 MHz, 32 MB Hash) He
>showed 61. Dxe4 Txe4 62. dxe4 Lxc5 3. Txg4 hxg4 as best moves (+1.56 for White).
>What is the best move?
chest finds the solution after examination of exactly one position (the first
one it tried):
E:\chest-3.19>chest319 -b epd.epd
[D] 8/8/pppppppK/NBBR1NRp/nbbrqnrP/PPPPPPPk/8/Q7 w - - acn 1; acs 0; bm Qh1#; ce
32766; dm 1; pv Qh1#;
Crafty found it at ply 2:
E:\PROGRA~2\winboard\Crafty>crafty
EPD Kit revision date: 1996.04.21
found computer opening book file [e:/crafty/release/bookc.bin].
hash table memory = 24M bytes.
pawn hash table memory = 4M bytes.
EGTB cache memory = 2M 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.
4 piece tablebase files found
1302kb of RAM used for TB indices and decompression tables
Crafty v17.11
White(1): epdpfga epd.epd epd.out
PFGA: EPD record: 1
middle-game phase
clearing hash tables
time surplus 0.00 time limit 30.00 (3:00)
nss depth time score variation (1)
1 43.87 7.19 1. dxe4 Rxd5 2. Rxg4 hxg4 3. exd5 Bxa5
4. Bxa4 dxc5 5. gxf4 gxf5 6. bxc4 cxd5
7. cxd5 exd5
1 50.87 ++ 1. Qh1#!!
1 50.87 Mate 1. Qh1#
1-> 50.87 Mate 1. Qh1#
2 50.87 Mate 1. Qh1#
2-> 50.89 Mate 1. Qh1#
time=51.17 cpu=99% mat=0 n=5928139 fh=100% nps=115851
ext-> checks=11 recaps=0 pawns=0 1rep=1 thrt:0
predicted=0 nodes=5928139 evals=4531128
endgame tablebase-> probes done=0 successful=0
hashing-> trans/ref=1% pawn=92% used=0%
I had a lot of stuff in memory, so it took crafty a long time to start up.
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