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Simplify pawnless endgame evaluation

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Retire KmmKm evaluation function. Instead give a very drawish
scale factor when the material advantage is small and not much
material remains.

Retire NoPawnsSF array. Pawnless endgames without a bishop will
now be scored higher. Pawnless endgames with a bishop pair will
be scored lower. The effect of this is hopefully small.

Consistent results both at short TC (fixed games):
ELO: -0.00 +-2.1 (95%) LOS: 50.0%
Total: 40000 W: 7405 L: 7405 D: 25190

And long TC (fixed games):
ELO: 0.77 +-1.9 (95%) LOS: 78.7%
Total: 39690 W: 6179 L: 6091 D: 27420

bench: 7213723
This commit is contained in:
Chris Cain
2014-01-16 21:50:08 +00:00
committed by Marco Costalba
parent 53ab32ef0b
commit df201175c6
3 changed files with 4 additions and 26 deletions
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src/endgame.h
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@@ -42,7 +42,6 @@ enum EndgameType {
KRKN, // KR vs KN
KQKP, // KQ vs KP
KQKR, // KQ vs KR
KmmKm, // K and two minors vs K and one or two minors
// Scaling functions