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Subject: More about ChessBase UCI bug (affects tablebases too)

Author: Gian-Carlo Pascutto

Date: 02:34:57 09/30/03


Apparently, it doesn't always happen. I can fully reproduce it in the original
tournament I had set up, but if I make another similar tournament, things work
as they should.

I'm afraid this means that even the people claiming things work for them
aren't safe, since it's more or less random (I'm guessing an uninitialized
variable or something like that), and they will get bitten later even though
it seems to work at first.

Another data point:

This is how it looks when it works correctly:

Sjeng: < uci

id name Deep Sjeng 1.5
id author Gian-Carlo Pascutto
option name Hash type spin default 165 min 1 max 495
option name NalimovPath type string default c:\tb\
option name NalimovCache type spin default 4 min 1 max 495
option name Ponder type check default true
option name MultiPV type spin default 1 min 1 max 60
option name CPUs type spin default 1 min 1 max 1
option name Drawscore (centipawns) type spin default 0 min -75 max 75
option name Anti Human mode type check default false
option name Personality type string default <empty>
option name Store brain type button
option name Load brain type button
option name Clear Hash type button
uciok
< setoption name Hash value 128
Allocated 4194304 hash entries, totalling 134217728 bytes, in shared memory.
< setoption name Ponder value false
< setoption name NalimovPath value d:\crafty\tb
< setoption name NalimovCache value 16
< isready
readyok

This is how it looks when the bug occurs:

Sjeng: < uci

id name Deep Sjeng 1.6Y
id author Gian-Carlo Pascutto
option name Hash type spin default 165 min 1 max 495
option name NalimovPath type string default c:\tb\
option name NalimovCache type spin default 4 min 1 max 495
option name Ponder type check default true
option name MultiPV type spin default 1 min 1 max 60
option name CPUs type spin default 1 min 1 max 1
option name Drawscore (centipawns) type spin default 0 min -75 max 75
option name Anti Human mode type check default false
option name Personality type string default <empty>
option name Store brain type button
option name Load brain type button
option name Clear Hash type button
uciok
< setoption name Hash value 1
Allocated 32768 hash entries, totalling 1048576 bytes, in shared memory.
< isready
readyok

Notice that not only is the hash not set, tablebases are disabled too!

--
GCP



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