From b4a1e0059ad6f1d0b77440ea3a711615744826a1 Mon Sep 17 00:00:00 2001
From: ProgramciDusunur <lerenarazl@gmail.com>
Date: Wed, 25 Dec 2024 15:04:42 +0300
Subject: [PATCH 1/2] if we only have pawns, let's stop doing NMP

---
 src/search.c | 12 +++++++++++-
 src/search.h |  3 +++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/search.c b/src/search.c
index 50905471..1e939256 100644
--- a/src/search.c
+++ b/src/search.c
@@ -283,6 +283,14 @@ void clearCounterMoves(void) {
     }
 }
 
+uint8_t justPawns(board *pos) {
+    return !((pos->bitboards[N] | pos->bitboards[n] | pos->bitboards[B] |
+              pos->bitboards[b] | pos->bitboards[R] | pos->bitboards[r] |
+              pos->bitboards[Q] | pos->bitboards[q]) &
+             pos->occupancies[pos->side]);
+}
+
+
 // quiescence search
 int quiescence(int alpha, int beta, board* position, time* time) {
     if ((searchNodes & 2047) == 0) {
@@ -530,7 +538,9 @@ int negamax(int alpha, int beta, int depth, board* position, time* time, bool cu
         return static_eval;
 
     // null move pruning
-    if (depth >= nullMoveDepth && in_check == 0 && position->ply && static_eval >= beta) {
+    if (depth >= nullMoveDepth &&
+        !in_check && position->ply && static_eval >= beta &&
+        !justPawns(position)) {
         struct copyposition copyPosition;
         // preserve board state
         copyBoard(position, &copyPosition);
diff --git a/src/search.h b/src/search.h
index d0f749ab..482fe4d7 100644
--- a/src/search.h
+++ b/src/search.h
@@ -7,6 +7,8 @@
 
 #pragma once
 
+
+#include <stdint.h>
 #include "structs.h"
 #include "time.h"
 #include "values.h"
@@ -37,6 +39,7 @@ void quiescence_sort_moves(moves *moveList, board* position);
 void enable_pv_scoring(moves *moveList, board* position);
 void printMove(int move);
 int getLmrReduction(int depth, int moveNumber);
+uint8_t justPawns(board *pos);
 void clearCounterMoves(void);
 int quiescence(int alpha, int beta, board* position, time* time);
 int negamax(int alpha, int beta, int depth, board* position, time* time, bool cutNode);

From 748a8b39419beaee78c13ea6cf582b7deadceb70 Mon Sep 17 00:00:00 2001
From: ProgramciDusunur <lerenarazl@gmail.com>
Date: Wed, 25 Dec 2024 15:04:50 +0300
Subject: [PATCH 2/2] bench: 8699257

---
 src/search.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/search.c b/src/search.c
index 1e939256..29891b78 100644
--- a/src/search.c
+++ b/src/search.c
@@ -532,7 +532,6 @@ int negamax(int alpha, int beta, int depth, board* position, time* time, bool cu
 
     int canPrune = in_check == 0 && pvNode == 0;
 
-
     // reverse futility pruning
     if (depth <= 2 && !pvNode && !in_check && static_eval - 82 * depth >= beta)
         return static_eval;