From: Marco Costalba <mcostalba@gmail.com>
Date: Tue, 24 Mar 2009 13:34:46 +0000 (+0100)
Subject: Let to toggle dynamic LMR
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=1c087dd806b65c5d6668706f0c8fddf14f6fcd41;ds=sidebyside

Let to toggle dynamic LMR

It is now disabled by default due to bad results
against a pool of engines...more testing is needed tough.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
---

diff --git a/src/search.cpp b/src/search.cpp
index c4446fc5..f5235192 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -121,6 +121,9 @@ namespace {
   // Depth limit for selective search:
   Depth SelectiveDepth = 7*OnePly;
 
+  // Use dynamic LMR?
+  const bool UseDynamicLMR = false;
+
   // Use internal iterative deepening?
   const bool UseIIDAtPVNodes = true;
   const bool UseIIDAtNonPVNodes = false;
@@ -1333,7 +1336,9 @@ namespace {
           && !move_is_killer(move, ss[ply]))
       {
           // LMR dynamic reduction
-          Depth R = (moveCount >= 2 * LMRNonPVMoves && depth > 7*OnePly ? 2*OnePly : OnePly);
+          Depth R =    UseDynamicLMR
+                    && moveCount >= 2 * LMRNonPVMoves
+                    && depth > 7*OnePly ? 2*OnePly : OnePly;
 
           ss[ply].reduction = R;
           value = -search(pos, ss, -(beta-1), newDepth-R, ply+1, true, threadID);