improve parent selection

src/logic/move.rs

@@ -22,6 +22,9 @@ pub struct Move {
     /// Indices of this Move's Children
     pub children: Vec<usize>,
 
+    /// Has this [`Move`] already attempted to create children?
+    pub tried_children: bool,
+
     /// Value of this move (including children)
     pub value: Option<i128>,
 
@@ -52,6 +55,7 @@ impl Move {
             color,
             is_trimmed: false,
             self_value: 0,
+            tried_children: false,
         };
         m.self_value = m.compute_self_value(agent_color);
         m