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Subject: Re: Tactical test position (Nxf7)

Author: Richard Pijl

Date: 13:19:14 05/08/03

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On May 08, 2003 at 15:47:46, Slobodan R. Stojanovic wrote:

>On May 08, 2003 at 10:01:40, Richard Pijl wrote:
>
>However, the sequence is almost correct:
>1.Nxf7, Kxf7 2.g4 Bh7 3.Qxe6+ Ke8 4.Qf7+ Kd8 5.Rhe1
>
>This one should be estimated wining for white:
>r2k2nr/ppqnbQpb/2p4p/8/2BP2P1/2N5/PPPB1P1P/2KRR3 b - - 0 5
>
>Test Baron now.

At your service :-)

This time at an AMD 2000+ MP (single CPU version, with a slightly modified
version (in passed pawn evaluation) compared to this afternoon):

 ply       time     nodes  score  pv

  4(10).      0     17152     11  g7g5 f2f4 d8c8 e1e7
  5(13)&      0     30652     11  g7g5 f2f4 d8c8 e1e7 g8e7
  5(13).      0     58203     11  g7g5 f2f4 d8c8 e1e7 g8e7
  6(15)&      0    143005    -13  g7g5 f2f4 b7b5 f4g5 h6g5 f7g7 e7f6
  6(15).      1    249960    -13  g7g5 f2f4 b7b5 f4g5 h6g5 f7g7 e7f6
  7(17)>      4    982975    -47  c7h2
  7(17)&      5   1190060    -47  c7h2 c4e6 h2d6 d4d5 c6c5 c3b5 d6a6
  7(19).     11   2410980    -47  c7h2 c4e6 h2d6 d4d5 c6c5 c3b5 d6a6
  8(20)&     17   3826117    -55  c7h2 c3e4 g8f6 e1h1 h2h1 d1h1 h7e4 f7g7
  8(21)>     20   4550029    -54  g7g5
  8(23).     52  11523534    -55  g7g5 d4d5 a7a6 d5c6 b7c6 f2f4 g5f4 d2f4
  9(27)-    207  46419085    -90  g7g5 d4d5 c6c5 c3b5 c7h2 d5d6 e7d6 f7e8
  9(27)&    218  48958243   -106  g7g5 d4d5 c6d5 c4d5 a7a6 f2f4 a8b8 f4f5 c7h2
c3e2
  9(27)>    236  53230858   -105  c7d6
  9(27)&    238  53600117   -102  c7d6 e1e6 d6b4 c4b3 b4d4 c3d5 d4c5 d5e7
  9(27).    308  69066908   -102  c7d6 e1e6 d6b4 c4b3 b4d4 c3d5 d4c5 d5e7
 10(26)&    384  85564785   -123  c7d6 e1e6 d6d4 d2h6 d4c4 e6e7 c4f7 d1d7 d8c8
d7c7 c8d8 e7f7 g8h6
 10(28)>    409  91357883   -122  g7g5

The Baron sees advantage for white, but the win is just too deep.

>Sl.
>
>
>>On May 08, 2003 at 09:26:42, stuart taylor wrote:
>>
>>>
>>>It's certainly (to the naked eye) a piece for 2 pawns and more, if not a good
>>>bit more! It can't be TOO much of a mistake!
>>>If there were serious looking counter attacking ideas for Black, then it might
>>>need more investigation.
>>>S.Taylor
>>
>>Baron, like the King, initially selects Nxf7 and drops it after 40 seconds (on a
>>PIII-500) for Bf4. The reason seems to be that it values Bf4 a little better
>>than Nxf7, not that Nxf7 is incorrect.
>>
>>I forced Nxf7 to check if there was a problem and I saw the score drop
>>(perspective of white from 122 to 46, and after more than an hour (again, on the
>>PIII-500) I got a fail high. But no convincing winning scores (yet).
>>
>> ply       time     nodes  score  pv
>>
>>  5( 9)-      0     15129   -109  e8f7 g2g4 f5h7 c4e6 f7e8 h1e1
>>  5(11)&      0     18763   -122  e8f7 g2g4 f5h7 c4e6 f7e8 h1e1
>>  5(11).      0     20409   -122  e8f7 g2g4 f5h7 c4e6 f7e8 h1e1
>>  6(12)&      0     37976   -114  e8f7 g2g4 f5h7 e2e6 f7e8 e6f7 e8d8 f7g7 e7f6
>>  6(12).      0     48971   -114  e8f7 g2g4 f5h7 e2e6 f7e8 e6f7 e8d8 f7g7 e7f6
>>  7(15)&      2    130800   -111  e8f7 g2g4 f5h7 e2e6 f7e8 e6f7 e8d8 d2f4 e7g5
>>f4g5 h6g5 f7g7
>>  7(15).      2    202327   -111  e8f7 g2g4 f5h7 e2e6 f7e8 e6f7 e8d8 d2f4 e7g5
>>f4g5 h6g5 f7g7
>>  8(19)+      5    388558    -76  e8f7 g2g4 f5h7 e2e6 f7e8 e6f7 e8d8 d2f4 c7f4
>>f7f4 e7g5 f4e3
>>  8(19)&      8    553021    -57  e8f7 g2g4 f5h7 c4e6 f7e8 d1e1 g8f6 e6f5 c7d8
>>f5h7
>>  8(19).      9    667706    -57  e8f7 g2g4 f5h7 c4e6 f7e8 d1e1 g8f6 e6f5 c7d8
>>f5h7
>>  9(23)&     29   1928019    -67  e8f7 g2g4 f5h7 c4e6 f7e8 d1e1 g8f6 e6f5 d7f8
>>f5h7 f8h7
>>  9(23).     31   2098188    -67  e8f7 g2g4 f5h7 c4e6 f7e8 d1e1 g8f6 e6f5 d7f8
>>f5h7 f8h7
>> 10(26)&    112   7159794    -46  e8f7 g2g4 f5h7 c4e6 f7e8 d1e1 g8f6 e6f5 d7f8
>>f5h7 h8h7 c3e4
>> 10(26).    120   7630546    -46  e8f7 g2g4 f5h7 c4e6 f7e8 d1e1 g8f6 e6f5 d7f8
>>f5h7 h8h7 c3e4
>> 11(31)&    395  24578175    -60  e8f7 g2g4 f5h7 e2e6 f7e8 e6f7 e8d8 f7g7 e7f6
>>g7f7 c7d6 f7e6 d6e6 c4e6
>> 11(31).    432  27077394    -60  e8f7 g2g4 f5h7 e2e6 f7e8 e6f7 e8d8 f7g7 e7f6
>>g7f7 c7d6 f7e6 d6e6 c4e6
>> 12(33)&   1110  68274645    -59  e8f7 g2g4 f5h7 e2e6 f7e8 e6f7 e8d8 h1e1 c7d6
>>e1e6 d6d4 d2h6 d4g4
>> 12(33).   1226  75878266    -59  e8f7 g2g4 f5h7 e2e6 f7e8 e6f7 e8d8 h1e1 c7d6
>>e1e6 d6d4 d2h6 d4g4
>> 13(34)-   2061 128125614    -94  e8f7 g2g4 f5h7 e2e6 f7e8 e6f7 e8d8 h1e1 d7b6
>>c4b3 c7h2 d4d5 b6d7
>> 13(36)&   4119 251648743    -93  e8f7 g2g4 f5h7 e2e6 f7e8 e6f7 e8d8 h1e1 g7g5
>>d4d5 a7a6 d5c6 b7c6 c3e4
>> 13(36).   4119 251648790    -93  e8f7 g2g4 f5h7 e2e6 f7e8 e6f7 e8d8 h1e1 g7g5
>>d4d5 a7a6 d5c6 b7c6 c3e4
>>
>>Richard.



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