From 66ce8ad5fd0e67904ca96dd9ac58f2e512a1f380 Mon Sep 17 00:00:00 2001
From: hxim <hxim.jo@gmail.com>
Date: Thu, 4 Jan 2018 22:31:30 +0100
Subject: [PATCH] Remove ThreatByHangingPawn bonus (#1356)

* no ThreatByHangingPawn

* bench: 4919682
---
 src/evaluate.cpp | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index c5375a8e..fa3b0a72 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -220,7 +220,6 @@ namespace {
   const Score WeakQueen             = S( 50, 10);
   const Score CloseEnemies          = S(  7,  0);
   const Score PawnlessFlank         = S( 20, 80);
-  const Score ThreatByHangingPawn   = S( 71, 61);
   const Score ThreatBySafePawn      = S(192,175);
   const Score ThreatByRank          = S( 16,  3);
   const Score Hanging               = S( 48, 27);
@@ -543,9 +542,6 @@ namespace {
         safeThreats = (shift<Right>(b) | shift<Left>(b)) & weak;
 
         score += ThreatBySafePawn * popcount(safeThreats);
-
-        if (weak ^ safeThreats)
-            score += ThreatByHangingPawn;
     }
 
     // Squares strongly protected by the opponent, either because they attack the
-- 
2.39.2