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Subject: Chess Programs don't blunder?

Author: Dann Corbit

Date: 21:20:48 07/05/02


It has often been said that chess programs simply don't blunder.  Sometimes,
even at very long time control (Witness TimeControl "14400") chess programs can
make spectacular blunders.  Here is a program with a very respectable rating:

{Current Gauntlet data}
65 TSCP-172         : 2098  222  97    28    16.1 %   2385   10.7 %
66 Freyr-1067       : 2098  207  63    56    16.1 %   2385    0.0 %
67 Esc-028          : 2094  232  89    32    15.6 %   2387    6.2 %
68 Aldebaran-070    : 2087   73  36   188    25.8 %   2271   12.2 %
69 DChess-102       : 2058  254  88    31    12.9 %   2390    6.5 %
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
70 31337-30         : 2033   94  33   196    19.1 %   2283    7.7 %
71 LarsenVB-407     : 2022  333  95    27    11.1 %   2383    0.0 %
72 Delfi 1.02       : 2021  289  87    31    11.3 %   2379    3.2 %
73 LordKing-29D     : 1993  269  86    30     8.3 %   2410   10.0 %
74 Storm-006        : 1956  328  86    30     8.3 %   2372    3.3 %

{Battle of the crowns 2nd division result:}
    Program          Score     %    Av.Op.  Elo    +   -    Draws

  1 Freyr        :  31.0/ 44  70.5   2292   2443   84 130   13.6 %
  2 Cilian       :  30.5/ 44  69.3   2293   2434   85 131   11.4 %
  3 Sjeng73      :  30.0/ 44  68.2   2293   2426   86 117   18.2 %
  4 Faile        :  28.0/ 44  63.6   2296   2394   91 102   22.7 %
  5 Averno       :  25.0/ 44  56.8   2301   2348   99  93   22.7 %
  6 SSEchess     :  24.0/ 44  54.5   2302   2334  103  90   22.7 %
  7 Gully2       :  22.5/ 44  51.1   2304   2312  108  94   15.9 %
  8 ColChess     :  22.0/ 44  50.0   2305   2305   95  95   22.7 %
  9 Chessterfield:  16.5/ 44  37.5   2312   2223   97  92   25.0 %
 10 DChess       :  16.5/ 44  37.5   2312   2223  123  92    6.8 %
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 11 NewRival     :  12.0/ 44  27.3   2319   2148  126  82   18.2 %
 12 Crux         :   6.0/ 44  13.6   2331   2011  204  71    9.1 %

And yet, look at this --> 3 stunning blunders in quick succession.

[Event "Computer chess game"]
[Site "MMCKEE_NT"]
[Date "2002.04.29"]
[Round "1"]
[White "MAD-005"]
[Black "DChess-102"]
[Result "1-0"]
[ECO "A35j"]
[Variation "English: Symmetrical, Four Knights"]
[TimeControl "14400"]

1.c4 c5 2.Nc3 Nf6 3.Nf3 Nc6 4.g3 e5 5.Bg2 Bd6 6.Qa4
{
[D]r1bqk2r/pp1p1ppp/2nb1n2/2p1p3/Q1P5/2N2NP1/PP1PPPBP/R1B1K2R b KQkq - acd 11;
acn 12370591; acs 31; am Ne4; ce 1; pv Be7 d3 d6 Nd5 O-O Nxe7+ Qxe7 Bg5 Bd7
O-O-O Nd4 Bxf6 gxf6 Qa5 Nxe2+;
}
.. Ne4 7.Nxe4
{
[D]r1bqk2r/pp1p1ppp/2nb4/2p1p3/Q1P1N3/5NP1/PP1PPPBP/R1B1K2R b KQkq - acd 12; acn
13308321; acs 31; am Na5; ce -432; pv Be7 d3 d6 Bd2 Bd7 Qa3 f5 Nc3 O-O O-O-O
Nb4;
}
.. Na5 8.Nxd6+ Kf8 9.Nxe5 Nxc4 10.Qxc4 Qe7 11.Nexf7
{
[D]r1b2k1r/pp1pqNpp/3N4/2p5/2Q5/6P1/PP1PPPBP/R1B1K2R b KQ - acd 11; acn
15754155; acs 31; am Qxf7; ce -1649; pv Rg8 d3 g5 Qxc5 Rg6 Bxg5 Rxg5 Nxg5 h6
Ngf7;
}
.. Qxf7 12.Qxf7# 1-0



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