simplify PosMap + BoardValueMap logic

src/logic/board_value.rs

@@ -20,7 +20,6 @@ impl BoardValueMap {
 
     /// Weights from: https://repub.eur.nl/pub/7142/ei2005-47.pdf
     pub fn new() -> Self {
-        let mut map = PosMap::new();
         assert_eq!(
             Board::BOARD_SIZE,
             8,
@@ -37,11 +36,6 @@ impl BoardValueMap {
             [-20, -50, -2, -2, -2, -2, -50, -20],
             [100, -20, 10, 5, 5, 10, -20, 100],
         ];
-
-        for (i, j) in Board::all_positions() {
-            map.set(i, j, POSITION_VALUES[i as usize][j as usize])
-        }
-
-        Self(map)
+        Self(PosMap::from(POSITION_VALUES))
     }
 }