most basic best move search

src/move.rs

@@ -1,4 +1,5 @@
 use std::slice;
+use std::ops::{Index, IndexMut};
 use crate::square::Square;
 use crate::board::PieceType;
 use crate::square::SQUARES;
@@ -103,6 +104,22 @@ impl MoveList {
     }
 }
 
+impl Index<usize> for MoveList {
+    type Output = Move;
+
+    #[inline(always)]
+    fn index(&self, index: usize) -> &Self::Output {
+        &self.moves[..self.count][index]
+    }
+}
+
+impl IndexMut<usize> for MoveList {
+    #[inline(always)]
+    fn index_mut(&mut self, index: usize) -> &mut Self::Output {
+        &mut self.moves[..self.count][index]
+    }
+}
+
 pub struct UndoMove {
     pub mv: Move,
     pub captured_piece: Option<PieceType>,