able to bump up depth more

src/complexagent.rs

@@ -223,7 +223,7 @@ impl FutureMoves {
             stack.extend(self.arena[idx].children.iter().copied());
         }
 
-        let mut new_arena = Vec::with_capacity(retain.iter().filter(|x| **x).count());
+        let mut new_arena = Vec::with_capacity(self.arena.len());
         let mut index_map = vec![None; self.arena.len()];
 
         for (old_idx, keep) in retain.iter().enumerate().rev() {
@@ -249,7 +249,7 @@ pub struct ComplexAgent {
 
 impl ComplexAgent {
     pub fn new(color: Piece) -> Self {
-        const MAX_DEPTH: usize = 5;
+        const MAX_DEPTH: usize = 7;
         Self {
             color,
             future_moves: FutureMoves::new(color, MAX_DEPTH),