Module Name:	pkgsrc
Committed By:	jlam
Date:		Tue Oct 23 05:53:53 UTC 2001

Modified Files:
	doc: pkg-CHANGES
	pkgsrc/games/crafty: Makefile distinfo

Log Message:
Update crafty to 18.12 and strongly-buildlinkify.  Relevant changes from
version 18.10 include:

- the pawn ram code is now disabled when playing a computer, although the
  normal 'blocked pawn' code is always active.
- bug in the code that penalizes a rook with no horizontal mobility was fixed.
  if the first rook scored had horizontal mobility, the second rook appeared
  to have this mobility as well, which was wrong.
- pawn hash statistics were wrong on longer searches due to an int overflow on
  a multiply and divide calculation.  this has been re-ordered to avoid the
  overflow.
- for unknown reasons, epd support was disabled.  it is now enabled as it
  should be.
- bug in EvaluateDraws() fixed to not call KBB vs KN a draw if the correct
  tablebase is not available.
- bishop pair scores now vary depending on how many pawns are left on the
  board.  a pair is not worth a lot if there are 7-8 pawns left as most
  diagonals will be blocked by pawns.
- a new way of handling the search extensions is in place.  with the old
  approach, one ply could not extend more than one full ply.  with the new
  approach, borrowed from Deep Blue, two consecutive plies can not extend more
  than two plies total.  It averages out to be the same, of course, but the
  effect is a bit different.  Now it is possible for a check and recapture to
  be applied at the same ply, where they could not before (since a check was
  already a full one-ply extension).  whether this is better or not is not
  clear yet, but it is worth careful analysis.


To generate a diff of this commit:
cvs rdiff -r1.5325 -r1.5326 doc/pkg-CHANGES
cvs rdiff -r1.17 -r1.18 pkgsrc/games/crafty/Makefile
cvs rdiff -r1.3 -r1.4 pkgsrc/games/crafty/distinfo

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.