From 4c294932e7b4a6ee3604f0c176dd01124524456f Mon Sep 17 00:00:00 2001
From: Marco Costalba <mcostalba@gmail.com>
Date: Mon, 15 Dec 2008 10:43:18 +0100
Subject: [PATCH] Better document null move dynamic reduction

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
---
 src/search.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/search.cpp b/src/search.cpp
index 6f2c48c9..ab3e6f66 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1183,7 +1183,7 @@ namespace {
 
         UndoInfo u;
         pos.do_null_move(u);
-        int R = (depth > 7 ? 4 : 3);
+        int R = (depth >= 4 * OnePly ? 4 : 3); // Null move dynamic reduction
 
         Value nullValue = -search(pos, ss, -(beta-1), depth-R*OnePly, ply+1, false, threadID);
 
-- 
2.39.2