From d940e59dad51e78d5146bb21c8f792379df64816 Mon Sep 17 00:00:00 2001
From: xoto10 <buylow001@gmail.com>
Date: Thu, 21 May 2020 21:17:21 +0100
Subject: [PATCH] Keep low ply history from previous move

This patch keeps the low-ply history from the previous move, shifting the data down by 2 ply.

Tested with closedpos book:

STC:
LLR: 2.93 (-2.94,2.94) {-0.50,1.50}
Total: 71584 W: 14175 L: 13891 D: 43518
Ptnml(0-2): 1069, 8228, 16993, 8354, 1148
https://tests.stockfishchess.org/tests/view/5ec0eaafe9d85f94dc429974

LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 96552 W: 13946 L: 13498 D: 69108
Ptnml(0-2): 676, 9082, 28375, 9404, 739
https://tests.stockfishchess.org/tests/view/5ec145efe9d85f94dc4299b0

closes https://github.com/official-stockfish/Stockfish/pull/2688

Bench 5148950
---
 src/search.cpp | 3 +++
 src/thread.cpp | 1 -
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/search.cpp b/src/search.cpp
index 7f29f771..5e9cd463 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -357,6 +357,9 @@ void Thread::search() {
               mainThread->iterValue[i] = mainThread->bestPreviousScore;
   }
 
+  std::copy(&lowPlyHistory[2][0], &lowPlyHistory.back().back() + 1, &lowPlyHistory[0][0]);
+  std::fill(&lowPlyHistory[MAX_LPH - 2][0], &lowPlyHistory.back().back() + 1, 0);
+
   size_t multiPV = Options["MultiPV"];
 
   // Pick integer skill levels, but non-deterministically round up or down
diff --git a/src/thread.cpp b/src/thread.cpp
index 88331f06..2e0c216e 100644
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -212,7 +212,6 @@ void ThreadPool::start_thinking(Position& pos, StateListPtr& states,
       th->rootDepth = th->completedDepth = 0;
       th->rootMoves = rootMoves;
       th->rootPos.set(pos.fen(), pos.is_chess960(), &setupStates->back(), th);
-      th->lowPlyHistory.fill(0);
   }
 
   setupStates->back() = tmp;
-- 
2.39.2