X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fmaterial.cpp;h=9d17af208c4261783f6d446bb165057994b64bee;hb=HEAD;hp=59e811260defcb3749923140a26147a43276894f;hpb=9742fb10fd83e82ad760e4cac5cef3d6dff670ed;p=stockfish
diff --git a/src/material.cpp b/src/material.cpp
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-/*
- Stockfish, a UCI chess playing engine derived from Glaurung 2.1
- Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2016 Marco Costalba, Joona Kiiski, 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
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Stockfish is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see .
-*/
-
-#include // For std::min
-#include
-#include // For std::memset
-
-#include "material.h"
-#include "thread.h"
-
-using namespace std;
-
-namespace {
-
- // Polynomial material imbalance parameters
-
- // pair pawn knight bishop rook queen
- const int Linear[6] = { 1667, -168, -1027, -166, 238, -138 };
-
- const int QuadraticOurs[][PIECE_TYPE_NB] = {
- // OUR PIECES
- // pair pawn knight bishop rook queen
- { 0 }, // Bishop pair
- { 40, 2 }, // Pawn
- { 32, 255, -3 }, // Knight OUR PIECES
- { 0, 104, 4, 0 }, // Bishop
- { -26, -2, 47, 105, -149 }, // Rook
- {-185, 24, 122, 137, -134, 0 } // Queen
- };
-
- const int QuadraticTheirs[][PIECE_TYPE_NB] = {
- // THEIR PIECES
- // pair pawn knight bishop rook queen
- { 0 }, // Bishop pair
- { 36, 0 }, // Pawn
- { 9, 63, 0 }, // Knight OUR PIECES
- { 59, 65, 42, 0 }, // Bishop
- { 46, 39, 24, -24, 0 }, // Rook
- { 101, 100, -37, 141, 268, 0 } // Queen
- };
-
- // Endgame evaluation and scaling functions are accessed directly and not through
- // the function maps because they correspond to more than one material hash key.
- Endgame EvaluateKXK[] = { Endgame(WHITE), Endgame(BLACK) };
-
- Endgame ScaleKBPsK[] = { Endgame(WHITE), Endgame(BLACK) };
- Endgame ScaleKQKRPs[] = { Endgame(WHITE), Endgame(BLACK) };
- Endgame ScaleKPsK[] = { Endgame(WHITE), Endgame(BLACK) };
- Endgame ScaleKPKP[] = { Endgame(WHITE), Endgame(BLACK) };
-
- // Helper used to detect a given material distribution
- bool is_KXK(const Position& pos, Color us) {
- return !more_than_one(pos.pieces(~us))
- && pos.non_pawn_material(us) >= RookValueMg;
- }
-
- bool is_KBPsKs(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;
- }
-
- /// imbalance() calculates the imbalance by comparing the piece count of each
- /// piece type for both colors.
- template
- int imbalance(const int pieceCount[][PIECE_TYPE_NB]) {
-
- const Color Them = (Us == WHITE ? BLACK : WHITE);
-
- int bonus = 0;
-
- // Second-degree polynomial material imbalance by Tord Romstad
- for (int pt1 = NO_PIECE_TYPE; pt1 <= QUEEN; ++pt1)
- {
- if (!pieceCount[Us][pt1])
- continue;
-
- int v = Linear[pt1];
-
- for (int pt2 = NO_PIECE_TYPE; pt2 <= pt1; ++pt2)
- v += QuadraticOurs[pt1][pt2] * pieceCount[Us][pt2]
- + QuadraticTheirs[pt1][pt2] * pieceCount[Them][pt2];
-
- bonus += pieceCount[Us][pt1] * v;
- }
-
- return bonus;
- }
-
-} // namespace
-
-namespace Material {
-
-/// Material::probe() looks up the current position's material configuration in
-/// the material hash table. It returns a pointer to the Entry if the position
-/// is found. Otherwise a new Entry is computed and stored there, so we don't
-/// have to recompute all when the same material configuration occurs again.
-
-Entry* probe(const Position& pos) {
-
- Key key = pos.material_key();
- Entry* e = pos.this_thread()->materialTable[key];
-
- if (e->key == key)
- return e;
-
- std::memset(e, 0, sizeof(Entry));
- e->key = key;
- e->factor[WHITE] = e->factor[BLACK] = (uint8_t)SCALE_FACTOR_NORMAL;
- e->gamePhase = pos.game_phase();
-
- // 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)
- return e;
-
- for (Color c = WHITE; c <= BLACK; ++c)
- if (is_KXK(pos, c))
- {
- e->evaluationFunction = &EvaluateKXK[c];
- return e;
- }
-
- // OK, we didn't find any special evaluation function for the current material
- // configuration. Is there a suitable specialized scaling function?
- EndgameBase* sf;
-
- if ((sf = pos.this_thread()->endgames.probe(key)) != nullptr)
- {
- e->scalingFunction[sf->strong_side()] = sf; // Only strong color assigned
- return e;
- }
-
- // 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)
- {
- if (is_KBPsKs(pos, c))
- e->scalingFunction[c] = &ScaleKBPsK[c];
-
- else if (is_KQKRPs(pos, c))
- e->scalingFunction[c] = &ScaleKQKRPs[c];
- }
-
- Value npm_w = pos.non_pawn_material(WHITE);
- Value npm_b = pos.non_pawn_material(BLACK);
-
- if (npm_w + npm_b == VALUE_ZERO && pos.pieces(PAWN)) // Only pawns on the board
- {
- if (!pos.count(BLACK))
- {
- assert(pos.count(WHITE) >= 2);
-
- e->scalingFunction[WHITE] = &ScaleKPsK[WHITE];
- }
- else if (!pos.count(WHITE))
- {
- assert(pos.count(BLACK) >= 2);
-
- e->scalingFunction[BLACK] = &ScaleKPsK[BLACK];
- }
- else if (pos.count(WHITE) == 1 && pos.count(BLACK) == 1)
- {
- // This is a special case because we set scaling functions
- // for both colors instead of only one.
- e->scalingFunction[WHITE] = &ScaleKPKP[WHITE];
- e->scalingFunction[BLACK] = &ScaleKPKP[BLACK];
- }
- }
-
- // Zero or just one pawn makes it difficult to win, even with a small material
- // advantage. This catches some trivial draws like KK, KBK and KNK and gives a
- // drawish scale factor for cases such as KRKBP and KmmKm (except for KBBKN).
- if (!pos.count(WHITE) && npm_w - npm_b <= BishopValueMg)
- e->factor[WHITE] = uint8_t(npm_w < RookValueMg ? SCALE_FACTOR_DRAW :
- npm_b <= BishopValueMg ? 4 : 14);
-
- if (!pos.count(BLACK) && npm_b - npm_w <= BishopValueMg)
- 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] = {
- { 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);
- return e;
-}
-
-} // namespace Material