2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2023 The Stockfish developers (see AUTHORS file)
5 Stockfish is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
10 Stockfish is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
19 //Definition of input features HalfKP of NNUE evaluation function
21 #ifndef NNUE_FEATURES_HALF_KA_V2_HM_H_INCLUDED
22 #define NNUE_FEATURES_HALF_KA_V2_HM_H_INCLUDED
24 #include "../nnue_common.h"
26 #include "../../evaluate.h"
27 #include "../../misc.h"
33 namespace Stockfish::Eval::NNUE::Features {
35 // Feature HalfKAv2_hm: Combination of the position of own king
36 // and the position of pieces. Position mirrored such that king always on e..h files.
39 // unique number for each piece type on each square
43 PS_B_PAWN = 1 * SQUARE_NB,
44 PS_W_KNIGHT = 2 * SQUARE_NB,
45 PS_B_KNIGHT = 3 * SQUARE_NB,
46 PS_W_BISHOP = 4 * SQUARE_NB,
47 PS_B_BISHOP = 5 * SQUARE_NB,
48 PS_W_ROOK = 6 * SQUARE_NB,
49 PS_B_ROOK = 7 * SQUARE_NB,
50 PS_W_QUEEN = 8 * SQUARE_NB,
51 PS_B_QUEEN = 9 * SQUARE_NB,
52 PS_KING = 10 * SQUARE_NB,
53 PS_NB = 11 * SQUARE_NB
56 static constexpr IndexType PieceSquareIndex[COLOR_NB][PIECE_NB] = {
57 // convention: W - us, B - them
58 // viewed from other side, W and B are reversed
59 { PS_NONE, PS_W_PAWN, PS_W_KNIGHT, PS_W_BISHOP, PS_W_ROOK, PS_W_QUEEN, PS_KING, PS_NONE,
60 PS_NONE, PS_B_PAWN, PS_B_KNIGHT, PS_B_BISHOP, PS_B_ROOK, PS_B_QUEEN, PS_KING, PS_NONE },
61 { PS_NONE, PS_B_PAWN, PS_B_KNIGHT, PS_B_BISHOP, PS_B_ROOK, PS_B_QUEEN, PS_KING, PS_NONE,
62 PS_NONE, PS_W_PAWN, PS_W_KNIGHT, PS_W_BISHOP, PS_W_ROOK, PS_W_QUEEN, PS_KING, PS_NONE }
65 // Index of a feature for a given king position and another piece on some square
66 template<Color Perspective>
67 static IndexType make_index(Square s, Piece pc, Square ksq);
71 static constexpr const char* Name = "HalfKAv2_hm(Friend)";
73 // Hash value embedded in the evaluation file
74 static constexpr std::uint32_t HashValue = 0x7f234cb8u;
76 // Number of feature dimensions
77 static constexpr IndexType Dimensions =
78 static_cast<IndexType>(SQUARE_NB) * static_cast<IndexType>(PS_NB) / 2;
80 #define B(v) (v * PS_NB)
81 static constexpr int KingBuckets[COLOR_NB][SQUARE_NB] = {
82 { B(28), B(29), B(30), B(31), B(31), B(30), B(29), B(28),
83 B(24), B(25), B(26), B(27), B(27), B(26), B(25), B(24),
84 B(20), B(21), B(22), B(23), B(23), B(22), B(21), B(20),
85 B(16), B(17), B(18), B(19), B(19), B(18), B(17), B(16),
86 B(12), B(13), B(14), B(15), B(15), B(14), B(13), B(12),
87 B( 8), B( 9), B(10), B(11), B(11), B(10), B( 9), B( 8),
88 B( 4), B( 5), B( 6), B( 7), B( 7), B( 6), B( 5), B( 4),
89 B( 0), B( 1), B( 2), B( 3), B( 3), B( 2), B( 1), B( 0) },
90 { B( 0), B( 1), B( 2), B( 3), B( 3), B( 2), B( 1), B( 0),
91 B( 4), B( 5), B( 6), B( 7), B( 7), B( 6), B( 5), B( 4),
92 B( 8), B( 9), B(10), B(11), B(11), B(10), B( 9), B( 8),
93 B(12), B(13), B(14), B(15), B(15), B(14), B(13), B(12),
94 B(16), B(17), B(18), B(19), B(19), B(18), B(17), B(16),
95 B(20), B(21), B(22), B(23), B(23), B(22), B(21), B(20),
96 B(24), B(25), B(26), B(27), B(27), B(26), B(25), B(24),
97 B(28), B(29), B(30), B(31), B(31), B(30), B(29), B(28) }
101 // Orient a square according to perspective (rotates by 180 for black)
102 static constexpr int OrientTBL[COLOR_NB][SQUARE_NB] = {
103 { SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1,
104 SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1,
105 SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1,
106 SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1,
107 SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1,
108 SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1,
109 SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1,
110 SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1 },
111 { SQ_H8, SQ_H8, SQ_H8, SQ_H8, SQ_A8, SQ_A8, SQ_A8, SQ_A8,
112 SQ_H8, SQ_H8, SQ_H8, SQ_H8, SQ_A8, SQ_A8, SQ_A8, SQ_A8,
113 SQ_H8, SQ_H8, SQ_H8, SQ_H8, SQ_A8, SQ_A8, SQ_A8, SQ_A8,
114 SQ_H8, SQ_H8, SQ_H8, SQ_H8, SQ_A8, SQ_A8, SQ_A8, SQ_A8,
115 SQ_H8, SQ_H8, SQ_H8, SQ_H8, SQ_A8, SQ_A8, SQ_A8, SQ_A8,
116 SQ_H8, SQ_H8, SQ_H8, SQ_H8, SQ_A8, SQ_A8, SQ_A8, SQ_A8,
117 SQ_H8, SQ_H8, SQ_H8, SQ_H8, SQ_A8, SQ_A8, SQ_A8, SQ_A8,
118 SQ_H8, SQ_H8, SQ_H8, SQ_H8, SQ_A8, SQ_A8, SQ_A8, SQ_A8 }
121 // Maximum number of simultaneously active features.
122 static constexpr IndexType MaxActiveDimensions = 32;
123 using IndexList = ValueList<IndexType, MaxActiveDimensions>;
125 // Get a list of indices for active features
126 template<Color Perspective>
127 static void append_active_indices(
131 // Get a list of indices for recently changed features
132 template<Color Perspective>
133 static void append_changed_indices(
135 const DirtyPiece& dp,
140 // Returns the cost of updating one perspective, the most costly one.
141 // Assumes no refresh needed.
142 static int update_cost(const StateInfo* st);
143 static int refresh_cost(const Position& pos);
145 // Returns whether the change stored in this StateInfo means that
146 // a full accumulator refresh is required.
147 static bool requires_refresh(const StateInfo* st, Color perspective);
150 } // namespace Stockfish::Eval::NNUE::Features
152 #endif // #ifndef NNUE_FEATURES_HALF_KA_V2_HM_H_INCLUDED