Author: Dann Corbit
Date: 20:09:44 02/26/01
Go up one level in this thread
On February 26, 2001 at 21:34:07, Sune Larsson wrote:
>
> [D]8/7b/8/8/1N5p/1pp5/7Q/k1K5 w - - 0 1
>
>
> It was late one night in the smoky, old club house. Master Paradox was
> blitzing as white against the stubborn Mr.Doubt. In highest time pressure
> Master Paradox played 1.Qa2+ and hissed out: "Mate". "Hah, this is no mate.
> I just take it!", Mr Doubt yelled and played his 1.-bxa2. "I said mate",
> replied Master Paradox with rugged voice - lifted his knight and placed it
> with a thud on c6 (2.Nc6). Mr Doubt stared at the position. Naturally he
> couldn't believe his own eyes...shuffled up the pieces and left the room
> without a word.
>
> True? Not really ;) This position is from Keres. White, a queen up, faces
> the unpleasant ...b2+. The only way to bring it home is the paradoxical
> 1.Qa2+! After 1.-bxa2 2.Nc6! black is helpless against the threat 3.Nd4
> with mate on b3(c2). A true beauty!
>
> Test: This position should be solvable since there is a forced mate.
crafty solves instantly:
EPD Kit revision date: 1996.04.21
found computer opening book file [e:\crafty\release/bookc.bin].
hash table memory = 48M bytes.
pawn hash table memory = 10M bytes.
EGTB cache memory = 16M 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.
6 piece tablebase files found
20899kb of RAM used for TB indices and decompression tables
Crafty v18.3
White(1): epdpfga mp.epd mp.out
PFGA: EPD record: 1
end-game phase
clearing hash tables
time surplus 0.00 time limit 30.00 (3:30)
nss depth time score variation (1)
8 0.36 Mat05 1. Qa2+ bxa2 2. Nc6 Bc2 3. Kxc2 h3
4. Nd4 h2 5. Nb3#
8-> 0.36 Mat05 1. Qa2+ bxa2 2. Nc6 Bc2 3. Kxc2 h3
4. Nd4 h2 5. Nb3#
9 0.37 Mat05 1. Qa2+ bxa2 2. Nc6 Bc2 3. Kxc2 h3
4. Nd4 h2 5. Nb3#
9-> 0.52 Mat05 1. Qa2+ bxa2 2. Nc6 Bc2 3. Kxc2 h3
4. Nd4 h2 5. Nb3#
time=0.52 cpu=96% mat=6 n=110770 fh=94% nps=213019
ext-> chk=11326 cap=0 pp=1764 1rep=2040 mate=616
predicted=0 nodes=110770 evals=11196
endgame tablebase-> probes done=616 successful=57
White(1):
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