diff --git a/src/search.cpp b/src/search.cpp
index b571cdf1..4b90ab1c 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -999,13 +999,6 @@ moves_loop: // When in check, search starts from here
                && (pos.is_discovery_check_on_king(~us, move) || pos.see_ge(move)))
           extension = 1;
 
-      // Shuffle extension
-      else if (   PvNode
-               && pos.rule50_count() > 18
-               && depth < 3
-               && ++thisThread->shuffleExts < thisThread->nodes.load(std::memory_order_relaxed) / 4)  // To avoid too many extensions
-          extension = 1;
-
       // Passed pawn extension
       else if (   move == ss->killers[0]
                && pos.advanced_pawn_push(move)
diff --git a/src/thread.cpp b/src/thread.cpp
index 680cd3ad..6eb00d63 100644
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -207,7 +207,7 @@ void ThreadPool::start_thinking(Position& pos, StateListPtr& states,
 
   for (Thread* th : *this)
   {
-      th->shuffleExts = th->nodes = th->tbHits = th->nmpMinPly = 0;
+      th->nodes = th->tbHits = th->nmpMinPly = 0;
       th->rootDepth = th->completedDepth = 0;
       th->rootMoves = rootMoves;
       th->rootPos.set(pos.fen(), pos.is_chess960(), &setupStates->back(), th);
diff --git a/src/thread.h b/src/thread.h
index 0517afc5..087ed382 100644
--- a/src/thread.h
+++ b/src/thread.h
@@ -60,7 +60,7 @@ public:
 
   Pawns::Table pawnsTable;
   Material::Table materialTable;
-  size_t pvIdx, pvLast, shuffleExts;
+  size_t pvIdx, pvLast;
   int selDepth, nmpMinPly;
   Color nmpColor;
   std::atomic<uint64_t> nodes, tbHits, bestMoveChanges;