From: Marco Costalba <mcostalba@gmail.com>
Date: Thu, 24 Jun 2010 17:00:03 +0000 (+0100)
Subject: Revert "Do IID also when we already have a ttMove"
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=d9a8dd0f7a498ec1cc191a78e7a6d44628a17133

Revert "Do IID also when we already have a ttMove"

Joona's testing reports very bad results at 5s, 30s and
even 1 minute TC, so revert.

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

diff --git a/src/search.cpp b/src/search.cpp
index 693bea94..a97d3e02 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1237,7 +1237,7 @@ namespace {
 
     // Step 9. Internal iterative deepening
     if (    depth >= IIDDepth[PvNode]
-        && (ttMove == MOVE_NONE || (PvNode && tte->depth() <= depth - 4 * OnePly))
+        &&  ttMove == MOVE_NONE
         && (PvNode || (!isCheck && ss->eval >= beta - IIDMargin)))
     {
         Depth d = (PvNode ? depth - 2 * OnePly : depth / 2);