diff --git a/AUTHORS b/AUTHORS
index 4638b41a..33a7a3d5 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -91,6 +91,7 @@ Luca Brivio (lucabrivio)
 Lucas Braesch (lucasart)
 Lyudmil Antonov (lantonov)
 Maciej Żenczykowski (zenczykowski)
+Malcolm Campbell (xoto10)
 Mark Tenzer (31m059)
 marotear
 Matthew Lai (matthewlai)
@@ -151,6 +152,12 @@ Tracey Emery (basepr1me)
 Uri Blass (uriblass)
 Vince Negri (cuddlestmonkey)
 
-# Additionally, we acknowledge the authors of fishtest,
-# an essential framework for the development of Stockfish:
+
+# Additionally, we acknowledge the authors and maintainer of fishtest,
+# an amazing and essential framework for the development of Stockfish!
+#
 # https://github.com/glinscott/fishtest/blob/master/AUTHORS
+
+
+
+
diff --git a/src/search.cpp b/src/search.cpp
index 6146bdf6..ec9c6b1d 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -393,6 +393,8 @@ void Thread::search() {
   contempt = (us == WHITE ?  make_score(ct, ct / 2)
                           : -make_score(ct, ct / 2));
 
+  int searchAgainCounter = 0;
+
   // Iterative deepening loop until requested to stop or the target depth is reached
   while (   ++rootDepth < MAX_PLY
          && !Threads.stop
@@ -410,6 +412,9 @@ void Thread::search() {
       size_t pvFirst = 0;
       pvLast = 0;
 
+      if (!Threads.increaseDepth)
+         searchAgainCounter++;
+
       // MultiPV loop. We perform a full root search for each PV line
       for (pvIdx = 0; pvIdx < multiPV && !Threads.stop; ++pvIdx)
       {
@@ -445,7 +450,7 @@ void Thread::search() {
           int failedHighCnt = 0;
           while (true)
           {
-              Depth adjustedDepth = std::max(1, rootDepth - failedHighCnt);
+              Depth adjustedDepth = std::max(1, rootDepth - failedHighCnt - searchAgainCounter);
               bestValue = ::search<PV>(rootPos, ss, alpha, beta, adjustedDepth, false);
 
               // Bring the best move to the front. It is critical that sorting
@@ -558,6 +563,11 @@ void Thread::search() {
               else
                   Threads.stop = true;
           }
+          else if (   Threads.increaseDepth
+                   && Time.elapsed() > Time.optimum() * fallingEval * reduction * bestMoveInstability * 0.6)
+                   Threads.increaseDepth = false;
+          else
+                   Threads.increaseDepth = true;
       }
 
       mainThread->iterValue[iterIdx] = bestValue;
diff --git a/src/thread.cpp b/src/thread.cpp
index f55bcb22..615d482c 100644
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -179,6 +179,7 @@ void ThreadPool::start_thinking(Position& pos, StateListPtr& states,
   main()->wait_for_search_finished();
 
   main()->stopOnPonderhit = stop = false;
+  increaseDepth = true;
   main()->ponder = ponderMode;
   Search::Limits = limits;
   Search::RootMoves rootMoves;
diff --git a/src/thread.h b/src/thread.h
index 4de30edb..aea86fd5 100644
--- a/src/thread.h
+++ b/src/thread.h
@@ -109,7 +109,7 @@ struct ThreadPool : public std::vector<Thread*> {
   uint64_t nodes_searched() const { return accumulate(&Thread::nodes); }
   uint64_t tb_hits()        const { return accumulate(&Thread::tbHits); }
 
-  std::atomic_bool stop;
+  std::atomic_bool stop, increaseDepth;
 
 private:
   StateListPtr setupStates;