Author: Bryan Hofmann
Date: 04:07:12 02/04/04
Go up one level in this thread
On February 04, 2004 at 06:16:53, Mike S. wrote: >In the Crafty doc, I found: > >"9. computer This command usually comes from xboard/win- >board, but can be used at any time to tell Crafty it is >playing a computer. This will prevent some things from hap- >pening, such as a draw score that varies, as well as adjust- >ing the book selection code to be more selective in what it >plays." > >First I seemingly misunderstood that, thinking WinBoard would send that command >automatically when an engine match is run. This seems not to be the case >automatically, also not in Arena. (The engine responds to the command when I >include it in the Crafty.rc file, or typed it in when running Crafty in a DOS >box.) > Winboard will only report playing a computer when it is in ICS mode and the system is identified as a computer on ICC/FICS. >What exactly does this command change (I don't quite understand "draw score that >varies")? It sets the following; -accept_draws = 1 (Turns on accepting draws) -resign = 9 (Set the resign threshold) -book_selection_width = 1 (set book selection width to 1) -usage_level = 0 (turns off usage/front end thinking time) -It also tells crafty yo use the bookc.bin file if it exists. The "resign 9" will make crafty resign roughly five moves after the score drops below -9.000. > >Does the search and evaluation remain the same (so that results from test suites >should be the same), with or without computer option? Yes > >IOW., does it only affect book selection and gameplay behaviour so to speak? Yes it sets it to a width of 1 meaning it will select the top sorted move. > >When the differences in book usage are not in effect (i.e. because GUI >controlled books or predefined opening variants are used): How is Crafty's >comp-comp performance affected, when the computer option is not turned on? Is an >estimation possible of the "long run" performance difference caused by that (if >any)? > >I guess, many Crafty (offline) comp-comp games are played without switching that >option on - just because people don't know about it. I nearly never saw it was >mentioned anywhere in postings. > >Thanks, >Mike Scheidl
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