diff --git a/src/search.cpp b/src/search.cpp
index 9b2d705e..aef6cf2b 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -384,11 +384,11 @@ void Thread::search(bool isMainThread) {
           ++depth;
           for (Thread* th : Threads)
               if (th != this && th->depth <= depth)
-                  th->depth = depth + ONE_PLY + Depth(th->idx - 1) / 2;
+                  th->depth = depth + Depth(3 * log(1 + th->idx));
       }
       else
           // This can cause a thread to search with the same depth for many iterations
-          depth = Threads.main()->depth + ONE_PLY + Depth(this->idx - 1) / 2;
+          depth = Threads.main()->depth + Depth(3 * log(1 + this->idx));
 
       if (depth >= DEPTH_MAX || Signals.stop || (Limits.depth && depth > Limits.depth))
           break;