timecat 1.52.0

A NNUE-based chess engine that implements the Negamax algorithm and can be integrated into any project as a library. It features move generation, advanced position evaluation through NNUE, and move searching capabilities.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157

use super::*;

#[rustfmt::skip]
static PSQT_ARRAY: [Score; 768] = [
    // Pawn Opening Phase:
      0,  0,  0,  0,  0,  0,  0,  0,
     50, 50, 50, 50, 50, 50, 50, 50,
     10, 20, 30, 40, 40, 30, 20, 10,
      5, 10, 20, 35, 35, 20, 10,  5,
      0,  5, 10, 30, 30, 10,  5,  0,
      5, -5,-10, 20, 20,-10, -5,  5,
      5, 10, 10,-20,-20, 10, 10,  5,
      0,  0,  0,  0,  0,  0,  0,  0,
    
    // Pawn Endgame Phase:
     60, 60, 60, 60, 60, 60, 60, 60,
     50, 50, 50, 50, 50, 50, 50, 50,
     40, 40, 40, 40, 40, 40, 40, 40,
     30, 30, 30, 30, 30, 30, 30, 30,
     20, 20, 20, 20, 20, 20, 20, 20,
     10, 10, 10, 10, 10, 10, 10, 10,
      0,  0,  0,  0,  0,  0,  0,  0,
      0,  0,  0,  0,  0,  0,  0,  0,

    // Knight Opening Phase:
    -50,-40,-30,-30,-30,-30,-40,-50,
    -40,-20,  0, 10, 10,  0,-20,-40,
    -30,  0, 15, 20, 20, 15,  0,-30,
    -30,  5, 20, 25, 25, 20,  5,-30,
    -30,  5, 20, 25, 25, 20,  5,-30,
    -30,  0, 15, 20, 20, 15,  0,-30,
    -40,-20,  0, 10, 10,  0,-20,-40,
    -50,-40,-30,-30,-30,-30,-40,-50,

    // Knight Endgame Phase:
    -50,-40,-30,-30,-30,-30,-40,-50,
    -40,-20,-10,  0,  0,-10,-20,-40,
    -30,-10, 10, 20, 20, 10,-10,-30,
    -30,  0, 20, 25, 25, 20,  0,-30,
    -30,  0, 20, 25, 25, 20,  0,-30,
    -30,-10, 10, 20, 20, 10,-10,-30,
    -40,-20,-10,  0,  0,-10,-20,-40,
    -50,-40,-30,-30,-30,-30,-40,-50,

    // Bishop Opening Phase:
    -20,-10,-10,-10,-10,-10,-10,-20,
    -10,  0,  5, 10, 10,  5,  0,-10,
    -10,  5, 10, 15, 15, 10,  5,-10,
    -10, 10, 10, 20, 20, 10, 10,-10,
    -10,  5, 15, 20, 20, 15,  5,-10,
    -10, 10, 10, 20, 20, 10, 10,-10,
    -10,  5,  5,  5,  5,  5,  5,-10,
    -20,-10,-10,-10,-10,-10,-10,-20,

    // Bishop Endgame Phase:
    -20,-10,-10,-10,-10,-10,-10,-20,
    -10,  0,  0, 10, 10,  0,  0,-10,
    -10,  0, 10, 20, 20, 10,  0,-10,
    -10, 10, 10, 30, 30, 10, 10,-10,
    -10, 10, 10, 30, 30, 10, 10,-10,
    -10,  0, 10, 20, 20, 10,  0,-10,
    -10,  0,  0, 10, 10,  0,  0,-10,
    -20,-10,-10,-10,-10,-10,-10,-20,

    // Rook Opening Phase:
      0,  0,  5, 10, 10,  5,  0,  0,
      5, 10, 10, 10, 10, 10, 10,  5,
      0,  5,  5,  5,  5,  5,  5,  0,
      0,  5,  5,  5,  5,  5,  5,  0,
      0,  5,  5,  5,  5,  5,  5,  0,
      0,  5,  5,  5,  5,  5,  5,  0,
      5, 10, 10, 10, 10, 10, 10,  5,
      0,  0,  5, 10, 10,  5,  0,  0,
    
    // Rook Endgame Phase:
     40, 50, 50, 50, 50, 50, 50, 40,
     50, 60, 60, 60, 60, 60, 60, 50,
     40, 50, 50, 50, 50, 50, 50, 40,
     40, 50, 50, 50, 50, 50, 50, 40,
     40, 50, 50, 50, 50, 50, 50, 40,
     40, 50, 50, 50, 50, 50, 50, 40,
     50, 60, 60, 60, 60, 60, 60, 50,
     40, 50, 50, 50, 50, 50, 50, 40,

    // Queen Opening Phase:
    -20,-10,-10, -5, -5,-10,-10,-20,
    -10,  0,  5,  5,  5,  5,  0,-10,
    -10,  5,  5, 10, 10,  5,  5,-10,
     -5,  0, 10, 10, 10, 10,  0, -5,
      0,  5, 10, 10, 10, 10,  5,  0,
    -10,  5,  5, 10, 10,  5,  5,-10,
    -10,  0,  5,  5,  5,  5,  0,-10,
    -20,-10,-10, -5, -5,-10,-10,-20,

    // Queen Endgame Phase:
    -20,-10,-10, -5, -5,-10,-10,-20,
    -10,  0,  5,  5,  5,  5,  0,-10,
    -10,  5,  5, 10, 10,  5,  5,-10,
     -5,  0, 10, 10, 10, 10,  0, -5,
     -5,  0, 10, 10, 10, 10,  0, -5,
    -10,  5,  5, 10, 10,  5,  5,-10,
    -10,  0,  5,  5,  5,  5,  0,-10,
    -20,-10,-10, -5, -5,-10,-10,-20,

    // King Opening Phase:
    -30,-40,-40,-50,-50,-40,-40,-30,
    -30,-40,-40,-50,-50,-40,-40,-30,
    -30,-40,-40,-50,-50,-40,-40,-30,
    -30,-40,-40,-50,-50,-40,-40,-30,
    -20,-30,-30,-40,-40,-30,-30,-20,
    -10,-15,-20,-20,-20,-20,-15,-10,
     20, 20,  0,  0,  0,  0, 20, 20,
     20, 30, 10,  0,  0, 10, 30, 20,
    
    // King Endgame Phase:
    -50,-40,-30,-30,-30,-30,-40,-50,
    -40,-20,-10,  0,  0,-10,-20,-40,
    -40,-10, 20, 30, 30, 20,-10,-40,
    -30,  0, 30, 40, 40, 30,  0,-30,
    -30,  0, 30, 40, 40, 30,  0,-30,
    -40,-10, 20, 30, 30, 20,-10,-40,
    -40,-30,  0,  0,  0,  0,-30,-40,
    -50,-40,-40,-30,-30,-40,-40,-50,
];

pub fn get_psqt_score_index_opening(piece: Piece, mut square: Square) -> usize {
    if piece.get_color() == White {
        square = square.horizontal_mirror();
    }
    (piece.get_piece_type().to_index() << 7) ^ square.to_index()
}

#[inline]
pub fn get_psqt_score_index_endgame(piece: Piece, square: Square) -> usize {
    get_psqt_score_index_opening(piece, square) ^ 64
}

#[inline]
pub fn get_psqt_score_opening(piece: Piece, square: Square) -> Score {
    *get_item_unchecked!(PSQT_ARRAY, get_psqt_score_index_opening(piece, square))
}

#[inline]
pub fn get_psqt_score_endgame(piece: Piece, square: Square) -> Score {
    *get_item_unchecked!(PSQT_ARRAY, get_psqt_score_index_endgame(piece, square))
}

pub fn get_psqt_score(piece: Piece, mut square: Square, alpha: f64) -> Score {
    let alpha = (1000.0 * alpha) as i32;
    if piece.get_color() == White {
        square = square.horizontal_mirror();
    }
    let opening_index = (piece.get_piece_type().to_index() << 7) ^ square.to_index();
    let opening_score = *get_item_unchecked!(PSQT_ARRAY, opening_index) as i32;
    let endgame_score = *get_item_unchecked!(PSQT_ARRAY, opening_index ^ 64) as i32;
    ((alpha * opening_score + (1000 - alpha) + endgame_score) / 1000) as Score
}