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Article #5721

Post information from Gnuchess 4.0

#5721
From: Chua Kong Sian
Date: Fri, 12 Jun 1992 07:47
25 lines
1654 bytes
Hi.  After playing around more with Gnuchess 4.0, I've discovered a
discrepancy(bug?) in the 'post' information.  This can only be seen if
you are running gnuchessr, where the post information does not overwrite
the previous one.  I noticed in many cases, the following.

5&    -8  10   44306  c8g4  g1f3  c6d4  e2f2  g4f3  g2f3
5&    -1  25  114646  e7b4  e1c1  c8g4  g1f3  b4c3  b2c3  g4f3  g2f3
5.   -59  33  158853  e7b4  e1c1  c8g4  g1f3  b4c3  b2c3  g4f3  g2f3

The first column shows the ply that Gnuchess 4.0 is searching.  The
second column shows the score.  The third is time taken and the fourth
is the no. of positions seen.  The rest are the best moves found at this
ply.

Notice that although the second line and the last line shows the same
move order, their score is different!  I strongly suspect that the bug
is in the printing of the score, rather than a bug in the calculation of
the score, but I haven't understood the source code enough to justify my
guess.

Of course Gnuchess 3.1 does not exhibit this discrepancy.

PS.  Is this considered a bug report?

Chua.
Technical Details
Message-ID: <1992Jun12.074717.25969@nuscc.nus.sg>
Path: arc1-ca.pugleaf.net!sparky!uunet!darwin.sura.net!jvnc.net!nuscc!ccecks

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X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 10d71d,d5a26047ebfac90d,start
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X-Google-ArrivalTime: 1992-06-11 19:59:10 PST
Newsgroups: gnu.chess
Path: arc1-ca.pugleaf.net!sparky!uunet!darwin.sura.net!jvnc.net!nuscc!ccecks
From: ccecks@nuscc.nus.sg (Chua Kong Sian)
Subject: Post information from Gnuchess 4.0
Message-ID: <1992Jun12.074717.25969@nuscc.nus.sg>
Sender: ccecks@nuscc.nus.sg (Chua Kong Sian (Mr))
Organization: National University of Singapore
Date: Fri, 12 Jun 1992 07:47:17 GMT
Lines: 25