Author: allan johnson
Date: 19:52:09 07/24/99
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On July 24, 1999 at 18:09:54, Jon Dart wrote: >The latest version of Arasan can be downloaded from >http://www.best.com/~jdart/arasan.htm. As before, >source is available. Mostly this version has bug >fixes and a few speed improvements. It has been >playing on ICC and has recently been rated over >2650 at blitz, running on a K6-2/400 (I don't attach >a lot of importance to the rating, and expect it >to fluctuate, but generally it seems to be playing >well). > >Following is the change summary (from the source archive): > >7-17-1999 : Arasan 5.2 > 1. Advanced unprotected pawns are penalized only if no other > penalty (isolation, etc.) has been given. > 2. Bug fixes in the scoring for passers protected by the king, > in is_theoretical_draw (for KBP vs K), and in pawn race > scoring. > 3. ArasanX will now claim a draw by repetition if its opponent > fails to do so. > 4. Somewhat less penalty is given for moving pawns near the king. > Rook passed pawns are scored less than other passed pawns but > the difference is less now. Other minor eval tweaks. > 5. Razoring is done at somewhat higher depths in the tree. > 6. Lazy evaluation parameters in the scoring module have been > tuned. > 7. Tweaks to time management code (in calctime.cpp). Generally > Arasan will use a little more time in "increment" games. > 8. Move_Ordering::order_captures was being called incorrectly > (passing in depth rather than alpha) - this is fixed. > 9. The PRankCount array in the Board class has been removed - > this information is calculated as needed in the Scoring > module. This has improved the search speed, especially for > endgames. Jon Thanks for the info about Arasan.I don't know much about it. How does it fare against the commercial programmes?By the way The computer chess web page Chessopolis from which I downloaded Arasan is well worth a visit for those who want a collection of grandmaster victories over computers and free chess software.The address is www.chessopolis.com/cchess.htm Regards Allan
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