Author: Jon Dart
Date: 20:17:21 05/21/02
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On May 21, 2002 at 22:37:12, Dann Corbit wrote: Changes include: 1) The king safety routine has been rewritten for greater speed and accuracy. 2) The search routine has been recoded. Futility pruning (regular, not extended) as described by Ernst Heinz is implemented. Razoring is now done in the main search routine and not in a separate one as in 5.4. Extensions have been changed, and check extensions now depend on the number of escape squares available to the king. 3) More elaborate lazy evaluation is done in the scoring module and more aggressive forward pruning in the quiescence search. 4) Passed pawn scores have been increased, as have bonuses for king centrality in the endgame (plus king near pawns, if the pawns are on one side of the board). 5) Lots of fixes in the Winboard/xboard driver (arasanx.cpp), for greater reliability and to get it to work under Linux using xboard. 6) A smaller hand-tuned book is used with this version. 7) Book learning based on game results is implemented. Some fixes and enhancements were also made to positional learning. 8) There is support for compressed Nalimov tablebases, Winboard protocol version 2, and Winboard analyze mode. --Jon
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