weight children differently

src/future_moves.rs

@@ -256,7 +256,10 @@ impl FutureMoves {
                 let children_value = node
                     .children
                     .iter()
-                    .map(|&child| self.arena[child].value)
+                    .rev() // rev then reverse so we get an index starting from the back
+                    .enumerate()
+                    // since children are sorted by value, we should weight the first one more
+                    .map(|(i, &child)| self.arena[child].value * (i as i64 + 1))
                     .sum::<i64>()
                     .checked_div(node.children.len() as i64)
                     .unwrap_or(0);