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Subject: Re: Test Positions

Author: Richard Pijl

Date: 12:29:03 02/09/03

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On February 09, 2003 at 09:33:03, David Rasmussen wrote:

>What would your engine play here, and if not the suggested move, then why not?
>
>[D]2r5/p4pk1/3p2p1/Pp2p3/1P1nP1P1/q2P3P/2r3B1/1R2QR1K b - - 0 33
>
>33... Rxg2

Baron rather plays Ne2:

 ply       time     nodes  score  pv

  5(11)>      0     29049    117  d4e2
  5(11)&      0     35414    142  d4e2 b1d1 e2f4 f1f2 g6g5
  5(11)>      0     40511    143  d4e6
  5(11)+      0     48242    186  d4e6 b1a1 a3b2 a1d1 c2g2
  5(11)&      0     52519    185  d4e6 e1e3 e6f4 g2f3 f4d3
  5(11).      0     69768    185  d4e6 e1e3 e6f4 g2f3 f4d3
  6(13)&      0    148555    161  d4e6 b1a1 a3c3 e1c3 c8c3 a1d1
  6(13)>      0    164570    162  d4e2
  6(13)&      0    187963    189  d4e2 e1f2 e2f4 f2a7 c8c7 a7b6
  6(13).      0    251570    189  d4e2 e1f2 e2f4 f2a7 c8c7 a7b6
  7(15)&      1    315703    189  d4e2 e1f2 e2f4 f2a7 c8c7 a7b8 f4g2
  7(15).      2    668359    189  d4e2 e1f2 e2f4 f2a7 c8c7 a7b8 f4g2
  8(19)&      4   1233022    188  d4e2 b1d1 e2f4 f1f2 f4d3 f2c2 d3e1 c2c8
  8(19)>      5   1443837    189  d4e6
  8(19)&      6   1836986    189  d4e6 b1a1 a3b2 a1b1 c2g2 b1b2 e6f4
  8(19).      8   2395506    189  d4e6 b1a1 a3b2 a1b1 c2g2 b1b2 e6f4
  9(20)&     15   4398439    198  d4e6 b1a1 a3b2 a1b1 b2d4 g2f3 e6f4 h3h4 g7f8
b1d1
  9(20)>     18   5339828    199  a3d3
  9(21)&     20   5841844    199  a3d3 b1d1 d3e2 e1e2 c2e2 d1c1 c8c2 c1c2 d4c2
f1b1
  9(21).     22   6598515    199  a3d3 b1d1 d3e2 e1e2 c2e2 d1c1 c8c2 c1c2 d4c2
f1b1
 10(22)&     27   8269135    205  a3d3 b1d1 d3e2 e1e2 c2e2 d1c1 c8c4 h3h4 e2b2
g2h3 c4c1
 10(22).     42  12825647    205  a3d3 b1d1 d3e2 e1e2 c2e2 d1c1 c8c4 h3h4 e2b2
g2h3 c4c1
 11(23)&     68  20496287    206  a3d3 b1d1 d3e2 e1e2 c2e2 d1c1 c8c2 c1c2 d4c2
f1b1 c2e1 g2f1
 11(23)>     94  28151226    207  d4e2
 11(24)&    149  44768775    211  d4e2 b1a1 a3d3 a1d1 d3g3 e1f2 g3f4 d1d3 f4f2
f1f2 e2f4
 11(24).    198  59707934    211  d4e2 b1a1 a3d3 a1d1 d3g3 e1f2 g3f4 d1d3 f4f2
f1f2 e2f4
 12(25)&    349 103878286    235  d4e2 b1a1 a3d3 a1d1 d3a3 d1a1 a3e3 f1f3 e3h6
a1d1 e2f4

>
>[D]8/p4pk1/3p2p1/Pp2p3/1P1n2P1/6KP/4q3/2Q2R2 b - - 0 38
>
>38... Qc4

Again Baron made a different choice:

 ply       time     nodes  score  pv

  4( 9).      0      9238    123  e2d3 g3h2 d4e2 c1e1 e2f4
  5(12)&      0     31036    154  e2d3 g3h2 d6d5 a5a6 d4e2 c1e1 d3e4
  5(12).      0     41971    154  e2d3 g3h2 d6d5 a5a6 d4e2 c1e1 d3e4
  6(15)+      0    101857    189  e2d3 g3h2 d4e2 c1e1 e2f4 h3h4 d3h3 h2g1 h3g4
e1g3 g4g3 g1h1
  6(16)&      0    134577    257  e2d3 g3g2 d4e2 c1e1 e2f4 f1f4 e5f4 e1a1 f7f6
a1c1
  6(16).      0    172659    257  e2d3 g3g2 d4e2 c1e1 e2f4 f1f4 e5f4 e1a1 f7f6
a1c1
  7(17)&      1    309551    285  e2d3 g3g2 d4e2 c1e1 e2f4 g2f2 d3c2 f2f3 c2g2
f3e3 f4d5 e3d3 g2h3 d3d2 h3c3
  7(17).      1    385989    285  e2d3 g3g2 d4e2 c1e1 e2f4 g2f2 d3c2 f2f3 c2g2
f3e3 f4d5 e3d3 g2h3 d3d2 h3c3
  8(19)&      2    826114    293  e2d3 g3g2 d4e2 c1e1 e2f4 f1f4 e5f4
  8(19).      3   1062489    293  e2d3 g3g2 d4e2 c1e1 e2f4 f1f4 e5f4
  9(21)&      7   2510677    300  e2d3 g3g2 d4e2 c1e1 e2f4 g2g1 d3h3 e1e4 h3g4
g1f2 f4h3 f2e3 g4e4 e3e4 f7f5 e4d5
  9(21).      9   3181330    300  e2d3 g3g2 d4e2 c1e1 e2f4 g2g1 d3h3 e1e4 h3g4
g1f2 f4h3 f2e3 g4e4 e3e4 f7f5 e4d5
 10(24)&     28   9237944    304  e2d3 g3g2 d4e2 c1e1 e2f4 g2g1 d3h3 e1e4 h3g4
g1f2 g4h4 f2e3 h4h3 e3f2
 10(24).     35  11908136    304  e2d3 g3g2 d4e2 c1e1 e2f4 g2g1 d3h3 e1e4 h3g4
g1f2 g4h4 f2e3 h4h3 e3f2
 11(26)&    131  42521215    315  e2d3 g3g2 d4e2 c1e1 e2f4 g2g1 d3h3 e1e4 h3g4
g1f2 g6g5 a5a6 g4h4 f2e3 h4h3 e3f2 h3h2 f2e1
 11(26).    157  51297019    315  e2d3 g3g2 d4e2 c1e1 e2f4 g2g1 d3h3 e1e4 h3g4
g1f2 g6g5 a5a6 g4h4 f2e3 h4h3 e3f2 h3h2 f2e1

>
>[D]8/p7/5k2/Pn1ppp2/1Pp4P/5K2/8/6R1 b - - 0 47
>
>47... Nd4+

This is a tough position where the danger and promotion of the h-pawn must be
weighed against the 4 connected passers. Baron opts for running with its own,
but I'm not sure that is the wisest to do. Although a big fail-low occurred, Nd4
is not played by Baron at all (and I don't have the time currently to give it a
longer shot at the position

 ply       time     nodes  score  pv

  6( 9)&      0      9413    259  d5d4 h4h5 c4c3 g1g6 f6f7 f3e2 e5e4 a5a6
  6(12)>      0     14140    260  e5e4
  6(12)&      0     18449    271  e5e4 f3f4 b5d4 f4e3 d4f3 g1h1 d5d4 e3f4
  6(12)>      0     21353    272  c4c3
  6(12)+      0     25101    278  c4c3 h4h5 e5e4 f3e2 d5d4 g1g6 f6e5 h5h6 d4d3
e2e3
  6(14)&      0     33453    277  c4c3 h4h5 e5e4 f3f2 d5d4 h5h6 f6f7 h6h7 d4d3
h7h8q b5d6
  6(14).      0     33735    277  c4c3 h4h5 e5e4 f3f2 d5d4 h5h6 f6f7 h6h7 d4d3
h7h8q b5d6
  7(15)>      0     47837    243  d5d4
  7(15)&      0     62285    268  d5d4 h4h5 e5e4 f3f2 d4d3 h5h6 f5f4 h6h7 f4f3
  7(15)>      0    100704    269  e5e4
  7(15)&      0    162908    278  e5e4 f3f2 f5f4 g1g5 e4e3 f2e1 f6e6
  7(15).      0    166686    278  e5e4 f3f2 f5f4 g1g5 e4e3 f2e1 f6e6
  8(16)&      0    211240    273  e5e4 f3f2 f5f4 g1g4 f4f3 g4f4 f6e7 f4f8
  8(16).      0    219596    273  e5e4 f3f2 f5f4 g1g4 f4f3 g4f4 f6e7 f4f8
  9(17)&      0    342038    300  e5e4 f3f2 f5f4 g1g5 e4e3 f2g2 c4c3 g5g4 f6e5
h4h5 c3c2 g4g5 e5e6
  9(17).      0    362019    300  e5e4 f3f2 f5f4 g1g5 e4e3 f2g2 c4c3 g5g4 f6e5
h4h5 c3c2 g4g5 e5e6
 10(19)&      1    734550    310  e5e4 f3f2 f5f4 g1g5 e4e3 f2g2 b5d4 g5d5 f4f3
g2f1 d4f5 d5d7 a7a6
 10(19).      2    798651    310  e5e4 f3f2 f5f4 g1g5 e4e3 f2g2 b5d4 g5d5 f4f3
g2f1 d4f5 d5d7 a7a6
 11(21)-      3   1249807    275  e5e4 f3f2 f5f4 h4h5 e4e3 f2f1 f4f3 h5h6 d5d4
h6h7 e3e2 f1f2 e2e1q f2e1 c4c3
 11(21)&      4   1730703    254  e5e4 f3f2 d5d4 h4h5 d4d3 h5h6 b5d6 h6h7 d6f7
g1g8 d3d2 f2e2 c4c3 e2d1
 11(21).      5   2251888    254  e5e4 f3f2 d5d4 h4h5 d4d3 h5h6 b5d6 h6h7 d6f7
g1g8 d3d2 f2e2 c4c3 e2d1
 12(22)&      7   2863042    254  e5e4 f3f2 d5d4 h4h5 d4d3 h5h6 b5d6 h6h7 d6f7
g1g8 d3d2 f2e2 c4c3 e2d1
 12(22).      9   3544577    254  e5e4 f3f2 d5d4 h4h5 d4d3 h5h6 b5d6 h6h7 d6f7
g1g8 d3d2 f2e2 c4c3 e2d1
 13(23)&     11   4669990    254  e5e4 f3f2 d5d4 h4h5 d4d3 h5h6 b5d6 h6h7 d6f7
g1g8 d3d2 f2e2 c4c3 e2d1 f5f4
 13(24)>     16   6333912    255  c4c3
 13(24).     21   8600560    254  c4c3 h4h5 d5d4 h5h6 d4d3 h6h7 e5e4 f3e3 b5d6
h7h8q f6e6
 14(27)-    253  89462326    219  c4c3 h4h5 d5d4 h5h6 b5d6 h6h7 d6f7 g1g8 c3c2
g8c8 e5e4 f3e2 f5f4 e2d2 d4d3 c8c7 e4e3 d2d3 c2c1b
 14(27)-    600 211747346    129  c4c3 h4h5 d5d4 h5h6 e5e4 f3e2 d4d3 e2d1 c3c2
d1c1 b5d6 h6h7 d6f7 g1g8 e4e3 g8f8 d3d2 c1c2 f6g6 c2d1
 14(28)&    873 306662826     18  c4c3 h4h5 d5d4 h5h6 e5e4 f3e2 d4d3 e2d1 c3c2
d1c1 b5d6 h6h7 d6f7 g1g8 f6e5 g8f8 f7h8
 14(28)>    875 307724422     19  d5d4
 14(28)>   1041 369550405     19  e5e4
 14(28).   1406 500295713     18  e5e4 f3f2 f5f4 h4h5 e4e3 f2f1 a7a6 h5h6 b5d6
h6h7 c4c3 h7h8q f6f7
 15(28)&   1458 519967242     18  e5e4 f3f2 d5d4 h4h5 c4c3 h5h6 c3c2 h6h7 b5d6
h7h8q f6e7
 15(28).   1477 527907910     18  e5e4 f3f2 d5d4 h4h5 c4c3 h5h6 c3c2 h6h7 b5d6
h7h8q f6e7
 16(28)&   1547 555042311     18  e5e4 f3f2 d5d4 h4h5 c4c3 h5h6 b5d6 h6h7 f5f4
h7h8q f6e6

Richard.



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