From: VoyagerOne <excelgeek@gmail.com>
Date: Mon, 17 Aug 2020 12:58:03 +0000 (-0400)
Subject: Remove history bonus from Eval
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=1c0b7bdf4f77b8160cebe8af96b28230e870a136;hp=65b976439f8867e81682c0b66da6796ad3176177

Remove history bonus from Eval

STC:
LLR: 2.92 (-2.94,2.94) {-1.50,0.50}
Total: 26776 W: 2787 L: 2725 D: 21264
https://tests.stockfishchess.org/tests/view/5f39d6beb38d442594aabd9b

LTC:
LLR: 2.93 (-2.94,2.94) {-1.50,0.50}
Total: 12968 W: 635 L: 608 D: 11725
https://tests.stockfishchess.org/tests/view/5f39decfb38d442594aabda7

closes https://github.com/official-stockfish/Stockfish/pull/3019

Bench:  4335100
---

diff --git a/src/search.cpp b/src/search.cpp
index 83fb722f..7c839dfc 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -794,11 +794,7 @@ namespace {
     else
     {
         if ((ss-1)->currentMove != MOVE_NULL)
-        {
-            int bonus = -(ss-1)->statScore / 512;
-
-            ss->staticEval = eval = evaluate(pos) + bonus;
-        }
+            ss->staticEval = eval = evaluate(pos);
         else
             ss->staticEval = eval = -(ss-1)->staticEval + 2 * Tempo;