From df2f7e75276cc93a8cb8c70057903ab0edbd92bd Mon Sep 17 00:00:00 2001
From: KJE-98 <>
Date: Thu, 14 Apr 2022 22:09:50 -0400
Subject: [PATCH] Decrease LMR at PV nodes with low depth.

This patch lessens the Late Move Reduction at PV nodes with low depth. Previously the affect of depth on LMR was independant of nodeType. The idea behind this patch is that at PV nodes, LMR at low depth is will miss out on potential alpha-raising moves.

Passed STC:
https://tests.stockfishchess.org/tests/view/625aa867d3367522c4b8965c
LLR: 2.93 (-2.94,2.94) <0.00,2.50>
Total: 19360 W: 5252 L: 5006 D: 9102
Ptnml(0-2): 79, 2113, 5069, 2321, 98

Passed LTC:
https://tests.stockfishchess.org/tests/view/625ae844d3367522c4b8a009
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 39264 W: 10636 L: 10357 D: 18271
Ptnml(0-2): 18, 3928, 11473, 4183, 30

closes https://github.com/official-stockfish/Stockfish/pull/3985

bench: 8129754
---
 AUTHORS        | 1 +
 src/search.cpp | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/AUTHORS b/AUTHORS
index 34b95ba5..edf189d8 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -104,6 +104,7 @@ jundery
 Justin Blanchard (UncombedCoconut)
 Kelly Wilson
 Ken Takusagawa
+Kian E (KJE-98)
 kinderchocolate
 Kiran Panditrao (Krgp)
 Kojirion
diff --git a/src/search.cpp b/src/search.cpp
index fa73dce5..49d7c5c9 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1173,6 +1173,10 @@ moves_loop: // When in check, search starts here
           if (PvNode && !ss->inCheck && abs(ss->staticEval - bestValue) > 250)
               r--;
 
+          // Increase depth based reduction if PvNode
+          if (PvNode)
+              r -= 15 / ( 3 + depth );
+
           ss->statScore =  thisThread->mainHistory[us][from_to(move)]
                          + (*contHist[0])[movedPiece][to_sq(move)]
                          + (*contHist[1])[movedPiece][to_sq(move)]
-- 
2.39.2