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Author SHA1 Message Date
Gary Linscott d0c2faa5fd Use CLOP mean value instead of max 2013-02-13 12:21:16 -05:00
Gary Linscott 671f24ff35 Merge branch 'simplify_eval' into bishop_pin_clop 2013-02-13 12:19:54 -05:00
Gary Linscott f32f899467 CLOP tuned 2013-02-13 00:12:02 -05:00
Gary Linscott 17b71fe51d Add clop parameters 2013-02-12 00:10:21 -05:00
Gary Linscott 30c2e3828a Merge branch 'master' into simplify_eval 2013-02-11 10:26:25 -05:00
Gary Linscott a7cdf7299a Bishop pins only 2013-02-11 10:26:18 -05:00
Gary LinscottandMarco Costalba c67fb8ef04 Add KBPKP endgame 
It is a draw if pawns are on G or B files, weaker pawn is
on rank 7 and bishop can't attack the pawn.

No functional change (because it is very rare and does not appear in bench)
 2013-02-07 06:51:55 +01:00
Gary Linscott a72710c660 Simplify eval take 2. Bench 5097444 2013-02-02 10:19:59 -05:00
Gary Linscott 57797822f8 Bring back just bishop pins 2013-01-26 15:35:00 -05:00
Gary Linscott e83b9075ff Simplify evaluation 2013-01-24 08:54:13 -05:00
Gary LinscottandMarco Costalba cee6336515 Detect drawish KQKP endings 
Based off of the rules from the wikipedia page,
here: http://en.wikipedia.org/wiki/Queen_versus_pawn_endgame.

bench does not change: 5312693 but patch is real, has been
tested on specific positions.
 2012-10-28 10:17:57 +01:00
Gary LinscottandMarco Costalba fdbe8006e0 Bonus for rook/queen attacking pawns on same rank 
Patch and tuning by Gary Linscott from an idea of Ryan Taker.

Double tested by Gary:

Wins: 3390 Losses: 2972 Draws: 11323
LOS: 99.999992%
ELO: 8.213465 +- 99%: 6.746506 95%: 5.124415
Win%: 51.181792 +- 99%: 0.969791 95%: 0.736740

And by me:

After 5612 games 1255  1085  3271 +11 ELO
 2012-09-21 23:25:13 +02:00
Gary Linscott 374c9e6b63 Add more detailed pawn shelter/storm evaluation 2012-03-26 07:52:10 -04:00
Gary Linscott dbe5e28eaa Merge remote-tracking branch 'upstream/master' 2012-03-25 10:18:29 -04:00
Gary Linscott f41a21fefd Penalty for undefended rook as well 2012-03-22 07:33:47 -04:00
Gary Linscott d1e18fc7dd Optimize undefended minor check. 2012-03-21 08:19:21 -04:00
Gary LinscottandMarco Costalba 3c6a4bfbed Penalize undefended minors 
Even if not under attack. This seems to be good
especially on openings.

After 12112 games at 10"+0.05
Mod vs Orig 2175 - 1997 - 7940 ELO +5 (+- 3.7)

[Patch series from Gary, little edited by me]

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2012-03-21 08:00:57 +01:00
Gary Linscott b46bf2950f Simpler stalemate check. 2012-02-05 14:52:01 -05:00
Gary Linscott 0347339970 Detect stalemate in KXK endgames 
Also, handle cases where there are 2 bishops of the same color.
 2012-02-05 10:24:53 -05:00