From 92cc4db8fcce604913a82079ccb1284881abf6a9 Mon Sep 17 00:00:00 2001
From: 87 <dev@87flowers.com>
Date: Thu, 13 Nov 2025 13:59:29 +0000
Subject: [PATCH] Bench: 11674122

---
 src/movepick.cpp | 12 ++----------
 src/movepick.hpp |  3 ---
 src/search.cpp   |  4 ----
 src/search.hpp   |  5 ++---
 4 files changed, 4 insertions(+), 20 deletions(-)

diff --git a/src/movepick.cpp b/src/movepick.cpp
index cfc1bdd9..40ab19e3 100644
--- a/src/movepick.cpp
+++ b/src/movepick.cpp
@@ -59,15 +59,7 @@ Move MovePicker::next() {
             goto emit_bad_noisy;
         }
 
-        m_stage = Stage::EmitKiller;
-
-        [[fallthrough]];
-
-    case Stage::EmitKiller:
         m_stage = Stage::ScoreQuiet;
-        if (m_tt_move != m_killer && m_killer != Move::none() && m_movegen.is_legal(m_killer)) {
-            return m_killer;
-        }
 
         [[fallthrough]];
 
@@ -81,7 +73,7 @@ Move MovePicker::next() {
     case Stage::EmitQuiet:
         while (m_current_index < m_quiet.size()) {
             auto [curr, score] = pick_next(m_quiet);
-            if (curr != m_tt_move && curr != m_killer) {
+            if (curr != m_tt_move) {
                 return curr;
             }
         }
@@ -95,7 +87,7 @@ Move MovePicker::next() {
     case Stage::EmitBadNoisy:
         while (m_current_index < m_bad_noisy.size()) {
             Move curr = m_bad_noisy[m_current_index++];
-            if (curr != m_tt_move && curr != m_killer) {
+            if (curr != m_tt_move) {
                 return curr;
             }
         }
diff --git a/src/movepick.hpp b/src/movepick.hpp
index 6a5f9abb..570dd500 100644
--- a/src/movepick.hpp
+++ b/src/movepick.hpp
@@ -19,7 +19,6 @@ class MovePicker {
         m_history(history),
         m_movegen(pos),
         m_tt_move(tt_move),
-        m_killer(ss->killer),
         m_ply(ply),
         m_stack(ss) {
     }
@@ -29,7 +28,6 @@ class MovePicker {
         GenerateMoves,
         ScoreNoisy,
         EmitGoodNoisy,
-        EmitKiller,
         ScoreQuiet,
         EmitQuiet,
         EmitBadNoisy,
@@ -68,7 +66,6 @@ class MovePicker {
     std::array<i32, 256> m_scores;
 
     Move           m_tt_move;
-    Move           m_killer;
     i32            m_ply;
     Search::Stack* m_stack;
 };
diff --git a/src/search.cpp b/src/search.cpp
index d8fe62f6..85ec23b8 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -508,8 +508,6 @@ Value Worker::search(
     i32        alpha_raises      = 0;
     Value      non_pawn_material = -1;
 
-    // Clear child's killer move.
-    (ss + 1)->killer = Move::none();
     // Clear child's fail high count
     (ss + 1)->fail_high_count = 0;
 
@@ -748,8 +746,6 @@ Value Worker::search(
         i32       bonus_depth = depth + (best_value >= beta + 100);
         const i32 bonus       = stat_bonus(bonus_depth);
         if (quiet_move(best_move)) {
-            ss->killer = best_move;
-
             m_td.history.update_quiet_stats(pos, best_move, ply, ss, bonus);
             for (Move quiet : quiets_played) {
                 m_td.history.update_quiet_stats(pos, quiet, ply, ss, -bonus);
diff --git a/src/search.hpp b/src/search.hpp
index 50f18bd6..59c7adb3 100644
--- a/src/search.hpp
+++ b/src/search.hpp
@@ -60,9 +60,8 @@ struct PV {
 };
 
 struct Stack {
-    Value          static_eval = 0;
-    Move           killer      = Move::none();
-    Move           excluded_move;
+    Value          static_eval     = 0;
+    Move           excluded_move   = Move::none();
     ContHistEntry* cont_hist_entry = nullptr;
     i32            fail_high_count = 0;
     PV             pv;