Implement quiescence search for leaf nodes

src/search/negamax.rs

@@ -4,6 +4,8 @@ use crate::{
     movegen::r#move::Move,
 };
 
+use super::quiescence::quiescence;
+
 pub fn negamax(
     game: &mut Game,
     mut alpha: i32,
@@ -14,7 +16,7 @@ pub fn negamax(
     let color = game.current_player();
 
     if depth == 0 {
-        return (None, evaluate_position(&game.board));
+        return (None, quiescence(game, alpha, beta).1);
     }
 
     let (mut best_move, mut best_score, mate_score) = (None, -100000, -50000 + plies as i32);