diff --git a/benches/future_children.rs b/benches/future_children.rs
index 498b9a4..b01527a 100644
--- a/benches/future_children.rs
+++ b/benches/future_children.rs
@@ -7,7 +7,7 @@ use othello::{
 fn extend_layers_no_pruning(depth: usize, arena_size: usize) -> usize {
     let config = FutureMoveConfig {
         max_depth: depth,
-        min_arena_depth_sub: 0,
+        min_arena_depth: 0,
         top_k_children: 5,
         up_to_minus: 4,
         max_arena_size: arena_size,
diff --git a/src/logic/future_moves.rs b/src/logic/future_moves.rs
index a84bda4..b923a39 100644
--- a/src/logic/future_moves.rs
+++ b/src/logic/future_moves.rs
@@ -26,10 +26,8 @@ pub struct FutureMoveConfig {
     /// Max depth of that we should try and traverse
     pub max_depth: usize,
 
-    /// subtract this value from FutureMove.max_depth
-    /// and that would be the min depth an arena should fill for
-    /// pruning to happen
-    pub min_arena_depth_sub: usize,
+    /// the min depth an arena should fill for pruning to happen
+    pub min_arena_depth: usize,
 
     /// when pruning, keep the top_k # of children
     pub top_k_children: usize,
@@ -357,9 +355,7 @@ impl FutureMoves {
     }
 
     fn prune_bad_children(&mut self) {
-        if self.config.max_depth > (self.current_depth + self.config.min_arena_depth_sub)
-            || self.config.do_not_prune
-        {
+        if self.current_depth < self.config.min_arena_depth || self.config.do_not_prune {
             return;
         }
 
@@ -466,7 +462,7 @@ mod tests {
 
     const FUTURE_MOVES_CONFIG: FutureMoveConfig = FutureMoveConfig {
         max_depth: 3, // we want great-grand children for traversing moves
-        min_arena_depth_sub: 0,
+        min_arena_depth: 0,
         top_k_children: 1,
         up_to_minus: 0,
         max_arena_size: 100,
diff --git a/src/main.rs b/src/main.rs
index 378e296..0bd349a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,7 +14,7 @@ fn main() {
         Piece::Black,
         FutureMoveConfig {
             max_depth: 20,
-            min_arena_depth_sub: 14,
+            min_arena_depth: 14,
             top_k_children: 2,
             up_to_minus: 10,
             max_arena_size: 50_000_000,