Add TT lookups in quiescence, move TT inside Game, remove redundant occupancy and time limit functions

src/board/board.rs

@@ -22,7 +22,7 @@ pub struct Board {
 }
 
 impl Board {
-    pub const fn new() -> Self {
+    pub const fn startpos() -> Self {
         Self {
             pieces: [
                 0xff00000000ff00,
@@ -37,7 +37,7 @@ impl Board {
         }
     }
 
-    pub const fn empty_board() -> Self {
+    pub const fn new_empty() -> Self {
         Self {
             pieces: [0x0, 0x0, 0x0, 0x0, 0x0, 0x0],
             color: [0x0, 0x0],
@@ -45,20 +45,8 @@ impl Board {
         }
     }
 
-    fn white_occupancies(&self) -> Bitboard {
-        self.color[Color::White]
-    }
-
-    fn black_occupancies(&self) -> Bitboard {
-        self.color[Color::Black]
-    }
-
-    pub fn all_occupancies(&self) -> Bitboard {
-        self.white_occupancies() | self.black_occupancies()
-    }
-
     pub fn is_attacked(&self, square: usize, opponent_color: Color) -> bool {
-        let all_occupancies = self.all_occupancies();
+        let all_occupancies = self.color[Color::White] | self.color[Color::Black];
         let own_color = opponent_color.opponent();
         let opponent_color_bb = &self.color[opponent_color];
 
@@ -108,7 +96,7 @@ impl Board {
     }
 
     pub fn pseudo_moves(&self, color: Color, piece_type: PieceType) -> Vec<Move> {
-        let all_occupancies = self.all_occupancies();
+        let all_occupancies = self.color[Color::White] | self.color[Color::Black];
         let pieces = self.pieces[piece_type] & self.color[color];
         let own_occupancies = self.color[color];
         let opponent_occupancies = self.color[color.opponent()];
@@ -186,7 +174,7 @@ impl Board {
 
 impl Default for Board {
     fn default() -> Self {
-        Self::new()
+        Self::new_empty()
     }
 }
 
@@ -277,9 +265,12 @@ mod tests {
     fn test_occupancies() -> Result<(), String> {
         let new_game = from_fen(FEN_EXAMPLE[0])?;
 
-        assert_eq!(new_game.board.white_occupancies(), 0x40000002000000);
-        assert_eq!(new_game.board.black_occupancies(), 0x900204401002);
-        assert_eq!(new_game.board.all_occupancies(), 0x40900206401002);
+        assert_eq!(new_game.board.color[Color::White], 0x40000002000000);
+        assert_eq!(new_game.board.color[Color::Black], 0x900204401002);
+        assert_eq!(
+            new_game.board.color[Color::White] | new_game.board.color[Color::Black],
+            0x40900206401002
+        );
 
         Ok(())
     }