ChildrenEvalMethod: add and switch to AverageDivDepth

benches/future_children.rs

@@ -13,7 +13,7 @@ fn extend_layers_no_pruning(depth: usize) -> usize {
         max_arena_size: usize::MAX,
         do_prune: false,
         print: false,
-        children_eval_method: ChildrenEvalMethod::Average,
+        children_eval_method: ChildrenEvalMethod::AverageDivDepth,
     };
     let mut fut = FutureMoves::new(Piece::Black, config);
     fut.update_from_board(&Board::new().starting_pos());