From: VoyagerOne <excelgeek@gmail.com>
Date: Sat, 8 Apr 2017 00:02:31 +0000 (-0700)
Subject: Standardize stat penalty
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=35b77b120ef5ca5d9db848e02e42642b1a93e982

Standardize stat penalty

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 90631 W: 16325 L: 16323 D: 57983

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 97679 W: 12779 L: 12759 D: 72141

Bench: 6340591

Closes #1053
---

diff --git a/src/search.cpp b/src/search.cpp
index d555b62e..85817cd1 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -97,8 +97,8 @@ namespace {
     Move best = MOVE_NONE;
   };
 
-  // EasyMoveManager structure is used to detect an 'easy move'. When the PV is
-  // stable across multiple search iterations, we can quickly return the best move.
+  // EasyMoveManager structure is used to detect an 'easy move'. When the PV is stable
+  // across multiple search iterations, we can quickly return the best move.
   struct EasyMoveManager {
 
     void clear() {
@@ -635,7 +635,7 @@ namespace {
             // Penalty for a quiet ttMove that fails low
             else if (!pos.capture_or_promotion(ttMove))
             {
-                Value penalty = -stat_bonus(depth + ONE_PLY);
+                Value penalty = -stat_bonus(depth);
                 thisThread->history.update(pos.side_to_move(), ttMove, penalty);
                 update_cm_stats(ss, pos.moved_piece(ttMove), to_sq(ttMove), penalty);
             }