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Subject: Re: Very Tough Mate in 4 for Some Engines

Author: Richard Pijl

Date: 06:10:55 03/28/03

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On March 27, 2003 at 21:12:39, William Kerr wrote:

>[D]8/3p1p2/5Ppp/K2R2bk/4pPrr/6Pp/4B2P/3N4 w - - bm Nc3;id #1097 mate in 4
>very-very tough;
>

On a PIII-500 the latest development version of the Baron finds a mate in 10
with Ne3 after 6 minutes. The move Ne3 is found is 2 seconds though.

 ply       time     nodes  score  pv

  6(11).      0     11409    549  f4g5 h6g5 g3h4 h5h4 e2g4 h4g4
  7(11)&      0     13457    549  f4g5 h6g5 g3h4 h5h4 e2g4 h4g4 d5d7
  7(13).      0     21204    549  f4g5 h6g5 g3h4 h5h4 e2g4 h4g4 d5d7
  8(13)+      0     22330    598  f4g5 h6g5 g3h4 h5h4 e2g4 h4g4 d5d7 g4f4
  8(13)+      0     26270    688  f4g5 h6g5 d1e3 h5h6 e3g4 h4g4 e2g4 e4e3 d5d7
e3e2
  8(14)&      0     29109    720  f4g5 h6g5 d1e3 h5h6 e3g4 h4g4 e2g4 e4e3 d5d7
e3e2
  8(15).      0     64593    720  f4g5 h6g5 d1e3 h5h6 e3g4 h4g4 e2g4 e4e3 d5d7
e3e2
  9(18)&      0     94019    725  f4g5 h6g5 d1e3 h5h6 e3g4 h4g4 e2g4 d7d6 d5d6
h6h7
  9(18).      1    146510    725  f4g5 h6g5 d1e3 h5h6 e3g4 h4g4 e2g4 d7d6 d5d6
h6h7
 10(20)+      1    177148    762  f4g5 h6g5 d1e3 h5h6 e3g4 h4g4 e2g4 d7d6 d5d6
h6h7 g4h3
 10(20)&      1    223082    811  f4g5 h6g5 d1e3 h5h6 e3g4 h4g4 e2g4 d7d6 d5d6
h6h7 g4h3
 10(20)>      2    272290    906  d1e3
 10(20)+      2    272291    906  d1e3 d7d6 f4g5 h6g5 g3h4 h5h4 e3g4 h4h5 d5d6
h5h4
 10(20)&      2    298771   1089  d1e3 d7d6 f4g5 h6g5 g3h4 h5h4 e3g4 h4h5 d5d6
h5h4
 10(20).      2    334601   1089  d1e3 d7d6 f4g5 h6g5 g3h4 h5h4 e3g4 h4h5 d5d6
h5h4
 11(20)-      4    514328   1054  d1e3
 11(20)-      4    577591    963  d1e3
 11(20)&      4    586402    980  d1e3
 11(20).      4    586739    980  d1e3
 12(17)+      4    615742   1072  d1e3 d7d6 f4g5 h6g5 g3h4 h5h4 e3g4 h4h5 g4e5
h5h6 e5f7 h6h7 f7d6 e4e3 d5g5 h7h6
 12(20)&      5    720307   1161  d1e3 d7d6 f4g5 h6g5 g3h4 h5h4 e3g4 h4h5 g4e5
h5h6 e5f7 h6h7 f7d6 e4e3 d5g5 h7h6
 12(21).      8   1007711   1161  d1e3 d7d6 f4g5 h6g5 g3h4 h5h4 e3g4 h4h5 g4e5
h5h6 e5f7 h6h7 f7d6 e4e3 d5g5 h7h6
 13(23)-     21   2716411   1126  d1e3
 13(23)&     21   2744750   1130  d1e3
 13(23).     22   2856073   1130  d1e3
 14(24)+     25   3201053   1172  d1e3 d7d6 f4g5 h6g5 g3h4 h5h4 e3g4 h4h5 g4e5
g5g4 e5f7 g6g5 f7d6 e4e3 f6f7 h5g6 f7f8q g6h5
 14(24)+     29   3693755   1263  d1e3
 14(24)&     29   3693758   1240  d1e3
 14(25).     62   7729606   1240  d1e3
 15(26)+     71   8890052   1276  d1e3 d7d6 f4g5 h6g5 g3h4 h5h4 e3g4 h4h5 g4e5
h5h4 e5g6 f7g6 d5d6 e4e3 a5a4
 15(26).     74   9332341   1366  d1e3 d7d6 f4g5 h6g5 g3h4 h5h4 e3g4 h4h5 g4e5
h5h4 e5g6 f7g6 d5d6 e4e3 a5a4
 16(27)+    100  12367800   1402  d1e3 d7d6 f4g5 h6g5 g3h4 h5h6 e3g4 h6h7 h4g5
h7g8 d5d6 e4e3 g4e3
 16(27)+    140  17266884   1492  d1e3 d7d6 f4g5 h6g5 g3h4 h5h4 e3g4 h4h5 g4e5
h5h4 e5g6 f7g6 d5d6 g5g4 f6f7 e4e3 f7f8q
 16(28)&    359  42614914  32748  d1e3 d7d6 f4g5 h6g5 g3h4 h5h4 e3g4 h4h5 g4e5
h5h4 e5g6 f7g6 d5d6 g5g4 f6f7 e4e3 f7f8q
 16(31).   2299 235816656  32748  d1e3 d7d6 f4g5 h6g5 g3h4 h5h4 e3g4 h4h5 g4e5
h5h4 e5g6 f7g6 d5d6 g5g4 f6f7 e4e3 f7f8q

Richard.



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