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Scale eval when down to only one pawn

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Passed both short TC
LLR: 2.97 (-2.94,2.94) [-1.50,4.50]
Total: 11921 W: 2346 L: 2208 D: 7367

And long TC
LLR: 2.97 (-2.94,2.94) [0.00,6.00]
Total: 21002 W: 3395 L: 3197 D: 14410

bench: 7602383
This commit is contained in:
shane31 2014-01-01 07:45:20 +11:00 • committed by Marco Costalba
parent c9dcda6ac4
commit 153309e287
3 changed files with 19 additions and 8 deletions
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8
src/evaluate.cpp
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@ -358,9 +358,9 @@ Value do_evaluate(const Position& pos) {
// If we don't already have an unusual scale factor, check for opposite
// colored bishop endgames, and use a lower scale for those.
if ( ei.mi->game_phase() < PHASE_MIDGAME
&& pos.opposite_bishops()
&& sf == SCALE_FACTOR_NORMAL)
if ( ei.mi->game_phase() < PHASE_MIDGAME
&& pos.opposite_bishops()
&& (sf == SCALE_FACTOR_NORMAL || sf == SCALE_FACTOR_ONEPAWN))
{
// Ignoring any pawns, do both sides only have a single bishop and no
// other pieces?
@ -375,7 +375,7 @@ Value do_evaluate(const Position& pos) {
else
// Endgame with opposite-colored bishops, but also other pieces. Still
// a bit drawish, but not as drawish as with only the two bishops.
sf = ScaleFactor(50);
sf = ScaleFactor(50 * sf / SCALE_FACTOR_NORMAL);
}
Value v = interpolate(score, ei.mi->game_phase(), sf);

10
src/material.cpp
View file

@ -246,6 +246,16 @@ Entry* probe(const Position& pos, Table& entries, Endgames& endgames) {
(npm_w == npm_b || npm_b < RookValueMg ? 0 : NoPawnsSF[std::min(pos.count<BISHOP>(BLACK), 2)]);
}
if (pos.count<PAWN>(WHITE) == 1 && npm_w - npm_b <= BishopValueMg)
{
e->factor[WHITE] = (uint8_t) SCALE_FACTOR_ONEPAWN;
}
if (pos.count<PAWN>(BLACK) == 1 && npm_b - npm_w <= BishopValueMg)
{
e->factor[BLACK] = (uint8_t) SCALE_FACTOR_ONEPAWN;
}
// Compute the space weight
if (npm_w + npm_b >= 2 * QueenValueMg + 4 * RookValueMg + 2 * KnightValueMg)
{

9
src/types.h
View file

@ -138,10 +138,11 @@ enum Phase {
};
enum ScaleFactor {
SCALE_FACTOR_DRAW = 0,
SCALE_FACTOR_NORMAL = 64,
SCALE_FACTOR_MAX = 128,
SCALE_FACTOR_NONE = 255
SCALE_FACTOR_DRAW = 0,
SCALE_FACTOR_ONEPAWN = 48,
SCALE_FACTOR_NORMAL = 64,
SCALE_FACTOR_MAX = 128,
SCALE_FACTOR_NONE = 255
};
enum Bound {