diff --git a/src/engine/search.rs b/src/engine/search.rs
index 2c80465..741194f 100755
--- a/src/engine/search.rs
+++ b/src/engine/search.rs
@@ -1215,6 +1215,8 @@ impl Worker<'_> {
 
             self.xb_enter(ply);
 
+            let lmp_scale = (sp.lmp_scale + if improving { sp.lmp_imp } else { -sp.lmp_imp }).max(0);
+
             while let Some(mv) = picker.next(&self.pos, self.xb_rows(), self.history) {
                 if !is_legal(&self.pos, mv, ksq, pinned, checkers, opp) {
                     continue;
@@ -1263,7 +1265,7 @@ impl Worker<'_> {
                     && mv.is_quiet()
                     && !N::PV
                     && depth <= sp.lmp_depth
-                    && res.move_count as i32 >= sp.lmp_base + sp.lmp_scale * depth * depth / 100
+                    && res.move_count as i32 >= sp.lmp_base + lmp_scale * depth * depth / 100
                 {
                     continue;
                 }
diff --git a/src/engine/search_params.rs b/src/engine/search_params.rs
index 444315b..56ad1d0 100755
--- a/src/engine/search_params.rs
+++ b/src/engine/search_params.rs
@@ -285,6 +285,7 @@ search_params! {
         T (lmp_depth,   5,   2, 10),
         T (lmp_base,    2,   1,  6),
         T (lmp_scale, 128,  25, 250),  // ·100
+        T (lmp_imp,    64,   0, 128),  // ·100, symmetric improving split
 
         //                 default   min  max
         T (hist_prune_depth,     8,    2,  12),