From: ajithcj <achajo@yahoo.co.in>
Date: Sat, 8 Oct 2016 05:06:33 +0000 (+0000)
Subject: Simplify futility pruning return value
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=f799610d4bb48bc280ea7f58cd5f78ab21028bf5

Simplify futility pruning return value

Return eval as it is while doing futility pruning.

STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 167687 W: 29778 L: 29904 D: 108005

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 26905 W: 3503 L: 3390 D: 20012

Bench: 5936728
---

diff --git a/src/search.cpp b/src/search.cpp
index eae34680..112e149d 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -743,7 +743,7 @@ namespace {
         &&  eval - futility_margin(depth) >= beta
         &&  eval < VALUE_KNOWN_WIN  // Do not return unproven wins
         &&  pos.non_pawn_material(pos.side_to_move()))
-        return eval - futility_margin(depth);
+        return eval;
 
     // Step 8. Null move search with verification search (is omitted in PV nodes)
     if (   !PvNode