X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fmaterial.cpp;h=0e1308780dd20d86d22662cceadc3e8473887f74;hb=09bef14c76e119103cc1a9404cbde7e249205deb;hp=4cfda03e4f3dcab3ee3bfed56553ea379e775826;hpb=96362fe3df141eeead4bdb863d2bb2d891886abf;p=stockfish
diff --git a/src/material.cpp b/src/material.cpp
index 4cfda03e..0e130878 100644
--- a/src/material.cpp
+++ b/src/material.cpp
@@ -2,7 +2,7 @@
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
- Copyright (C) 2015-2018 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
+ Copyright (C) 2015-2020 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -18,7 +18,6 @@
along with this program. If not, see .
*/
-#include // For std::min
#include
#include // For std::memset
@@ -31,18 +30,18 @@ namespace {
// Polynomial material imbalance parameters
- const int QuadraticOurs[][PIECE_TYPE_NB] = {
+ constexpr int QuadraticOurs[][PIECE_TYPE_NB] = {
// OUR PIECES
// pair pawn knight bishop rook queen
- {1667 }, // Bishop pair
- { 40, 0 }, // Pawn
- { 32, 255, -3 }, // Knight OUR PIECES
+ {1438 }, // Bishop pair
+ { 40, 38 }, // Pawn
+ { 32, 255, -62 }, // Knight OUR PIECES
{ 0, 104, 4, 0 }, // Bishop
- { -26, -2, 47, 105, -149 }, // Rook
- {-189, 24, 117, 133, -134, -10 } // Queen
+ { -26, -2, 47, 105, -208 }, // Rook
+ {-189, 24, 117, 133, -134, -6 } // Queen
};
- const int QuadraticTheirs[][PIECE_TYPE_NB] = {
+ constexpr int QuadraticTheirs[][PIECE_TYPE_NB] = {
// THEIR PIECES
// pair pawn knight bishop rook queen
{ 0 }, // Bishop pair
@@ -70,14 +69,12 @@ namespace {
bool is_KBPsK(const Position& pos, Color us) {
return pos.non_pawn_material(us) == BishopValueMg
- && pos.count(us) == 1
&& pos.count(us) >= 1;
}
bool is_KQKRPs(const Position& pos, Color us) {
return !pos.count(us)
&& pos.non_pawn_material(us) == QueenValueMg
- && pos.count(us) == 1
&& pos.count(~us) == 1
&& pos.count(~us) >= 1;
}
@@ -87,7 +84,7 @@ namespace {
template
int imbalance(const int pieceCount[][PIECE_TYPE_NB]) {
- const Color Them = (Us == WHITE ? BLACK : WHITE);
+ constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
int bonus = 0;
@@ -132,7 +129,7 @@ Entry* probe(const Position& pos) {
Value npm_w = pos.non_pawn_material(WHITE);
Value npm_b = pos.non_pawn_material(BLACK);
- Value npm = std::max(EndgameLimit, std::min(npm_w + npm_b, MidgameLimit));
+ Value npm = clamp(npm_w + npm_b, EndgameLimit, MidgameLimit);
// Map total non-pawn material into [PHASE_ENDGAME, PHASE_MIDGAME]
e->gamePhase = Phase(((npm - EndgameLimit) * PHASE_MIDGAME) / (MidgameLimit - EndgameLimit));
@@ -140,10 +137,10 @@ Entry* probe(const Position& pos) {
// Let's look if we have a specialized evaluation function for this particular
// material configuration. Firstly we look for a fixed configuration one, then
// for a generic one if the previous search failed.
- if ((e->evaluationFunction = pos.this_thread()->endgames.probe(key)) != nullptr)
+ if ((e->evaluationFunction = Endgames::probe(key)) != nullptr)
return e;
- for (Color c = WHITE; c <= BLACK; ++c)
+ for (Color c : { WHITE, BLACK })
if (is_KXK(pos, c))
{
e->evaluationFunction = &EvaluateKXK[c];
@@ -152,9 +149,9 @@ Entry* probe(const Position& pos) {
// OK, we didn't find any special evaluation function for the current material
// configuration. Is there a suitable specialized scaling function?
- EndgameBase* sf;
+ const auto* sf = Endgames::probe(key);
- if ((sf = pos.this_thread()->endgames.probe(key)) != nullptr)
+ if (sf)
{
e->scalingFunction[sf->strongSide] = sf; // Only strong color assigned
return e;
@@ -163,7 +160,7 @@ Entry* probe(const Position& pos) {
// We didn't find any specialized scaling function, so fall back on generic
// ones that refer to more than one material distribution. Note that in this
// case we don't return after setting the function.
- for (Color c = WHITE; c <= BLACK; ++c)
+ for (Color c : { WHITE, BLACK })
{
if (is_KBPsK(pos, c))
e->scalingFunction[c] = &ScaleKBPsK[c];
@@ -206,22 +203,16 @@ Entry* probe(const Position& pos) {
e->factor[BLACK] = uint8_t(npm_b < RookValueMg ? SCALE_FACTOR_DRAW :
npm_w <= BishopValueMg ? 4 : 14);
- if (pos.count(WHITE) == 1 && npm_w - npm_b <= BishopValueMg)
- e->factor[WHITE] = (uint8_t) SCALE_FACTOR_ONEPAWN;
-
- if (pos.count(BLACK) == 1 && npm_b - npm_w <= BishopValueMg)
- e->factor[BLACK] = (uint8_t) SCALE_FACTOR_ONEPAWN;
-
// Evaluate the material imbalance. We use PIECE_TYPE_NONE as a place holder
// for the bishop pair "extended piece", which allows us to be more flexible
// in defining bishop pair bonuses.
- const int PieceCount[COLOR_NB][PIECE_TYPE_NB] = {
+ const int pieceCount[COLOR_NB][PIECE_TYPE_NB] = {
{ pos.count(WHITE) > 1, pos.count(WHITE), pos.count(WHITE),
pos.count(WHITE) , pos.count(WHITE), pos.count(WHITE) },
{ pos.count(BLACK) > 1, pos.count(BLACK), pos.count(BLACK),
pos.count(BLACK) , pos.count(BLACK), pos.count(BLACK) } };
- e->value = int16_t((imbalance(PieceCount) - imbalance(PieceCount)) / 16);
+ e->value = int16_t((imbalance(pieceCount) - imbalance(pieceCount)) / 16);
return e;
}