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Subject: Re: wow! My stupid program can find it!!

Author: Uri Blass

Date: 06:39:52 07/24/02

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On July 24, 2002 at 09:02:42, Steffen Jakob wrote:

>On July 24, 2002 at 08:45:58, Robert Hyatt wrote:
>
>>On July 24, 2002 at 02:43:21, Grzegorz Sidorowicz wrote:
>>
>>>[D] r1b1r1k1/1q3ppp/ppn5/2bNp3/P4B2/5Q1P/BP3PP1/R2R2K1 w - -
>>>
>>>Armageddon 2.139 on PII350MHz
>>>
>>>depth time    nodes       score   variation
>>>-------------------------------------------
>>>1     0       4           -321    f4e5
>>>1     0       17          -315    d5b6
>>>1     0       45          -104    b2b4
>>>1     0       245         -104    b2b4
>>>2     0       266         -129    b2b4 c6b4
>>>2     0       366         -114    f3e4 c8e6
>>>2     0       1634        -114    f3e4 c8e6
>>>3     0       2820        -117    f3e4 c8h3 f4e5
>>>3     0       4254        -110    f4e3 e5e4 f3f4
>>>3     0       9439        -110    f4e3 e5e4 f3f4
>>>4     0       16749       -99     f4e3 e5e4 f3f4 c5e3
>>>4     0       33460       -92     f4g3 c8e6 g3e5 c5f2
>>>4     0       60805       -92     f4g3 c8e6 g3e5 c5f2
>>>5     1       110962      -96     f4g3 c6d4 f3d3 c8f5 d3c4
>>>6     3       349356      -113    f4g3 a8b8 f3e4 c8e6 g3e5 c6e5 e4e5 e6h3
>>>6     11      1175004     -80     f4h6 e8e6 h6d2 e6d6 b2b4 c6d4
>>>7     15      1617919     -96     f4h6 e8e6 h6d2 a8b8 a1c1 c6d4 f3e4
>>>8     54      5803092     -97     f4h6 e8e6 h6d2 e6g6 a1c1 c8e6 b2b3 e6d5
>>>8     1.35    10224214    -86     f4e3 a8b8 f3g3 e8f8 d1c1 c8f5 e3c5 b6c5 a2c4
>>>9     3.23    22556319    -76     f4e3 c5e3 f3e3 b6b5 a4b5 a6b5 e3c5 c8e6 c5d6
>>>a8d8 d6c7
>>>10    7.16    49661951    -73     f4e3 c8e6 a1c1 e8c8 e3c5 b6c5 d1d2 b7a7 d5c3
>>>e6a2
>>>10    9.46    65388959    -51     d5f6 g7f6 a2d5 c8d7 f4h6 c5f8 f3f6 f8h6 d5f7
>>>g8f8 f7e8 f8e8 d1d7 b7d7
>>>10    11.43   76350730    3       d5f6 g7f6 f4h6 c5f8 a2d5 c8d7
>>>11    13.7    85371759    0       d5f6 g7f6 f4h6 c5f8 a2d5 c8d7 f3f6 d7e6 d5c6
>>>b7c6 f6g5 g8h8 g5f6 h8g8
>>>
>>>Armageddon see only draw, but see Nf6! :)
>>>
>>>Best Regards
>>>Grzegorz
>>
>>
>>Finding Nf6+ is not hard.  Finding Nf6+ with a winning score is....
>
>For Hossa it is hard. He doesnt find it in reasonable time.
>
>Greetings,
>Steffen.

Crafty also does not find it in a reasonable time on p800 and the time is
similiar to the time that movei needs.

movei needs 7 minutes to fail high on Nf6+ at depth 11 but it needs more than 11
minutes to solve the fail high and find the 0.00 score.

If I detect repetition in the qsearch the result is clearly better and movei
fails high on Nf6+ at depth 10 and in that case it needs less than 5 minutes to
see the 0.00 score for Nf6+.

New position
r1b1r1k1/1q3ppp/ppn5/2bNp3/P4B2/5Q1P/BP3PP1/R2R2K1 w - - 0 1

Analysis by Crafty 18.15:

1.Bg5
  =  (-0.11)   Depth: 1/10   00:00:00
1.Bg5 Qd7
  ³  (-0.35)   Depth: 2/10   00:00:00
1.Bg5 h6 2.Bd2
  ³  (-0.43)   Depth: 3/10   00:00:00
1.Bg5 Nd4 2.Qh5 Qc6
  ³  (-0.70)   Depth: 4/10   00:00:00
1.Bg5 h6 2.Bd2 Nd4 3.Qh5
  ³  (-0.65)   Depth: 5/16   00:00:00
1.Bg3 Bd4 2.Rd2 e4 3.Qh5
  ³  (-0.48)   Depth: 5/16   00:00:00
1.Bg3 Bd4 2.Nc3 e4 3.Nxe4 Bxb2
  ³  (-0.57)   Depth: 6/16   00:00:00  152kN
1.Be3 Bxe3 2.Qxe3 b5 3.Qg5 h6 4.Nf6+ Kh8
  ³  (-0.28)   Depth: 6/16   00:00:01  327kN
1.Be3 Bxe3 2.Qxe3 b5 3.axb5 axb5 4.Qg5 h6 5.Nf6+ Kh8
  ³  (-0.31)   Depth: 7/19   00:00:02  678kN
1.Be3 Bxe3 2.Qxe3 b5 3.Qg3 Re6 4.Bb3 bxa4 5.Rxa4 Rd6
  ³  (-0.30)   Depth: 8/22   00:00:04  1521kN
1.Be3 Be6 2.Bxc5 bxc5 3.Rd2 Rab8 4.Qg3 Red8 5.Nf6+ Kh8 6.Rxd8+ Nxd8 7.Bxe6 Nxe6
  ³  (-0.33)   Depth: 9/24   00:00:14  6056kN
1.Be3 Be6 2.Rac1 Bxe3 3.Qxe3 Rac8 4.Qf3 Red8 5.Bb3 Bxd5 6.Bxd5 h6
  ³  (-0.47)   Depth: 10/26   00:00:54  23673kN
1.Bh6 Re6 2.Be3 Bd4 3.Bc4 Bd7 4.Rd2 Rc8 5.Rad1 Rd6
  ³  (-0.29)   Depth: 10/26   00:01:59  53263kN
1.Bh6 Re6 2.Be3 Bd4 3.Bc4 Bd7 4.Qe4 Bxe3 5.fxe3 Na5 6.Nf6+ Rxf6 7.Qxb7 Nxb7
8.Rxd7
  ³  (-0.30)   Depth: 11/31   00:02:54  76962kN
1.Bh6 Re6 2.Be3 Bd4 3.Bc4 h6 4.Qe4 Na5 5.Be2 Nb3 6.Ra3 Rd6 7.Rxb3 Qxd5 8.Qxd5
Rxd5 9.Bxd4 exd4 10.Rxb6
  ³  (-0.37)   Depth: 12/34   00:06:56  187242kN
1.Nf6+ gxf6 2.Bh6 Bf8 3.Bd5 Bd7 4.Qxf6 Re6 5.Bxe6 Bxe6 6.Qg5+ Kh8 7.Bxf8 Rxf8
8.Qf6+ Kg8 9.Qg5+ Kh8
  =  (0.00)   Depth: 12/34   00:08:34  230736kN

(Blass, Tel-aviv 24.07.2002)

Uri



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