stellar

0 #ifndef STELLAR_SCORE_H

1 #define STELLAR_SCORE_H

2

3 #include <array>

4

5 #include "piece.hpp"

6 #include "utils.hpp"

7 #define MAX_PLY 64

8

9 #define SCORE_INFINITY 32000

10 #define MATE_VALUE 31000

11 #define MATE_SCORE 30000

12

13 namespace score {

14

15 inline constexpr const uint16_t value[2][6] = {

16 {82, 337, 365, 477, 1025, 12000},

17 {94, 201, 297, 512, 936, 12000},

18 };

19

20 inline constexpr const int16_t position[2][6][64] = {

21 // clang-format off

22 {

23 {

24 0, 0, 0, 0, 0, 0, 0, 0,

25 -35, -1, -20, -23, -15, 24, 38, -22,

26 -26, -4, -4, -10, 3, 3, 33, -12,

27 -27, -2, -5, 12, 17, 6, 10, -25,

28 -14, 13, 6, 21, 23, 12, 17, -23,

29 -6, 7, 26, 31, 65, 56, 25, -20,

30 98, 134, 61, 95, 68, 126, 34, -11,

31 0, 0, 0, 0, 0, 0, 0, 0,

32 }, {

33 -105, -21, -58, -33, -17, -28, -19, -23,

34 -29, -53, -12, -3, -1, 18, -14, -19,

35 -23, -9, 12, 10, 19, 17, 25, -16,

36 -13, 4, 16, 13, 28, 19, 21, -8,

37 -9, 17, 19, 53, 37, 69, 18, 22,

38 -47, 60, 37, 65, 84, 129, 73, 44,

39 -73, -41, 72, 36, 23, 62, 7, -17,

40 -167, -89, -34, -49, 61, -97, -15, -107,

41 }, {

42 -33, -3, -14, -21, -13, -12, -39, -21,

43 4, 15, 16, 0, 7, 21, 33, 1,

44 0, 15, 15, 15, 14, 27, 18, 10,

45 -6, 13, 13, 26, 34, 12, 10, 4,

46 -4, 5, 19, 50, 37, 37, 7, -2,

47 -16, 37, 43, 40, 35, 50, 37, -2,

48 -26, 16, -18, -13, 30, 59, 18, -47,

49 -29, 4, -82, -37, -25, -42, 7, -8,

50 }, {

51 -19, -13, 1, 17, 16, 7, -37, -26,

52 -44, -16, -20, -9, -1, 11, -6, -71,

53 -45, -25, -16, -17, 3, 0, -5, -33,

54 -36, -26, -12, -1, 9, -7, 6, -23,

55 -24, -11, 7, 26, 24, 35, -8, -20,

56 -5, 19, 26, 36, 17, 45, 61, 16,

57 27, 32, 58, 62, 80, 67, 26, 44,

58 32, 42, 32, 51, 63, 9, 31, 43,

59 }, {

60 -1, -18, -9, 10, -15, -25, -31, -50,

61 -35, -8, 11, 2, 8, 15, -3, 1,

62 -14, 2, -11, -2, -5, 2, 14, 5,

63 -9, -26, -9, -10, -2, -4, 3, -3,

64 -27, -27, -16, -16, -1, 17, -2, 1,

65 -13, -17, 7, 8, 29, 56, 47, 57,

66 -24, -39, -5, 1, -16, 57, 28, 54,

67 -28, 0, 29, 12, 59, 44, 43, 45,

68 }, {

69 -15, 36, 12, -54, 8, -28, 24, 14,

70 1, 7, -8, -64, -43, -16, 9, 8,

71 -14, -14, -22, -46, -44, -30, -15, -27,

72 -49, -1, -27, -39, -46, -44, -33, -51,

73 -17, -20, -12, -27, -30, -25, -14, -36,

74 -9, 24, 2, -16, -20, 6, 22, -22,

75 29, -1, -20, -7, -8, -4, -38, -29,

76 -65, 23, 16, -15, -56, -34, 2, 13,

77 }

78 }, {

79 {

80 0, 0, 0, 0, 0, 0, 0, 0,

81 13, 8, 8, 10, 13, 0, 2, -7,

82 4, 7, -6, 1, 0, -5, -1, -8,

83 13, 9, -3, -7, -7, -8, 3, -1,

84 32, 24, 13, 5, -2, 4, 17, 17,

85 94, 100, 85, 67, 56, 53, 82, 84,

86 178, 173, 158, 134, 147, 132, 165, 187,

87 0, 0, 0, 0, 0, 0, 0, 0,

88 }, {

89 -29, -51, -23, -15, -22, -18, -50, -64,

90 -42, -20, -10, -5, -2, -20, -23, -44,

91 -23, -3, -1, 15, 10, -3, -20, -22,

92 -18, -6, 16, 25, 16, 17, 4, -18,

93 -17, 3, 22, 22, 22, 11, 8, -18,

94 -24, -20, 10, 9, -1, -9, -19, -41,

95 -25, -8, -25, -2, -9, -25, -24, -52,

96 -58, -38, -13, -28, -31, -27, -63, -99,

97 }, {

98 -23, -9, -23, -5, -9, -16, -5, -17,

99 -14, -18, -7, -1, 4, -9, -15, -27,

100 -12, -3, 8, 10, 13, 3, -7, -15,

101 -6, 3, 13, 19, 7, 10, -3, -9,

102 -3, 9, 12, 9, 14, 10, 3, 2,

103 2, -8, 0, -1, -2, 6, 0, 4,

104 -8, -4, 7, -12, -3, -13, -4, -14,

105 -14, -21, -11, -8, -7, -9, -17, -24,

106 }, {

107 -9, 2, 3, -1, -5, -13, 4, -20,

108 -6, -6, 0, 2, -9, -9, -11, -3,

109 -4, 0, -5, -1, -7, -12, -8, -16,

110 3, 5, 8, 4, -5, -6, -8, -11,

111 4, 3, 13, 1, 2, 1, -1, 2,

112 7, 7, 7, 5, 4, -3, -5, -3,

113 11, 13, 13, 11, -3, 3, 8, 3,

114 13, 10, 18, 15, 12, 12, 8, 5,

115 }, {

116 -33, -28, -22, -43, -5, -32, -20, -41,

117 -22, -23, -30, -16, -16, -23, -36, -32,

118 -16, -27, 15, 6, 9, 17, 10, 5,

119 -18, 28, 19, 47, 31, 34, 39, 23,

120 3, 22, 24, 45, 57, 40, 57, 36,

121 -20, 6, 9, 49, 47, 35, 19, 9,

122 -17, 20, 32, 41, 58, 25, 30, 0,

123 -9, 22, 22, 27, 27, 19, 10, 20,

124 }, {

125 -53, -34, -21, -11, -28, -14, -24, -43,

126 -27, -11, 4, 13, 14, 4, -5, -17,

127 -19, -3, 11, 21, 23, 16, 7, -9,

128 -18, -4, 21, 24, 27, 23, 9, -11,

129 -8, 22, 24, 27, 26, 33, 26, 3,

130 10, 17, 23, 15, 20, 45, 44, 13,

131 -12, 17, 14, 17, 17, 38, 23, 11,

132 -74, -35, -18, -18, -11, 15, 4, -17,

133 }

134 }

135 // clang-format on

136 };

137

138 inline constexpr const uint16_t phase_opening = 6192;

139 inline constexpr const uint16_t phase_endgame = 518;

140

141 inline constexpr int16_t interpolate(int16_t phase_score, int16_t opening, int16_t endgame) {

142 return (opening * phase_score + endgame * (phase_opening - phase_score)) / phase_opening;

143 }

144

145 enum Phase {

146 OPENING,

147 ENDGAME,

148 };

149

150 inline constexpr int16_t get(const Type piece, const Phase phase = OPENING) { return value[phase][piece]; }

151

152 inline constexpr int16_t get(Type piece, Color color, Square square, Phase phase = ENDGAME) {

153 if (color != WHITE) square = get_mirror(square);

154 return position[phase][piece][square];

155 }

156

157 inline constexpr const uint8_t pawn_double_opening = 5;

158 inline constexpr const uint8_t pawn_double_endgame = 10;

159 inline constexpr const uint8_t pawn_isolated_opening = 5;

160 inline constexpr const uint8_t pawn_isolated_endgame = 10;

161

162 inline constexpr const std::array<std::array<int16_t, 8>, 2> pawn_passed = {

163 {{0, 10, 30, 50, 75, 100, 150, 200}, {200, 150, 100, 75, 50, 30, 10, 0}}};

164

165 inline constexpr const uint8_t file_open_semi = 10;

166 inline constexpr const uint8_t file_open = 15;

167

168 } // namespace score

169

170 #endif