Remove material corrHist

Passed STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 80832 W: 21150 L: 20975 D: 38707
Ptnml(0-2): 283, 9531, 20598, 9736, 268
https://tests.stockfishchess.org/tests/view/670302fe86d5ee47d953bd68

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 46008 W: 11621 L: 11423 D: 22964
Ptnml(0-2): 30, 5072, 12606, 5262, 34
https://tests.stockfishchess.org/tests/view/6704074686d5ee47d953be53

Passed LTC Rebased:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 95814 W: 24340 L: 24195 D: 47279
Ptnml(0-2): 71, 10497, 26602, 10690, 47
https://tests.stockfishchess.org/tests/view/670ae1ac86d5ee47d953c262

closes #5636

Bench: 1119774

src/movepick.h

@@ -167,10 +167,6 @@ using PawnHistory = Stats<int16_t, 8192, PAWN_HISTORY_SIZE, PIECE_NB, SQUARE_NB>
 using PawnCorrectionHistory =
   Stats<int16_t, CORRECTION_HISTORY_LIMIT, COLOR_NB, CORRECTION_HISTORY_SIZE>;
 
-// MaterialCorrectionHistory is addressed by color and material configuration
-using MaterialCorrectionHistory =
-  Stats<int16_t, CORRECTION_HISTORY_LIMIT, COLOR_NB, CORRECTION_HISTORY_SIZE>;
-
 // MajorPieceCorrectionHistory is addressed by color and king/major piece (Queen, Rook) positions
 using MajorPieceCorrectionHistory =
   Stats<int16_t, CORRECTION_HISTORY_LIMIT, COLOR_NB, CORRECTION_HISTORY_SIZE>;

src/search.cpp

@@ -83,7 +83,6 @@ Value to_corrected_static_eval(Value v, const Worker& w, const Position& pos, St
     const Color us    = pos.side_to_move();
     const auto  m     = (ss - 1)->currentMove;
     const auto  pcv   = w.pawnCorrectionHistory[us][pawn_structure_index<Correction>(pos)];
-    const auto  mcv   = w.materialCorrectionHistory[us][material_index(pos)];
     const auto  macv  = w.majorPieceCorrectionHistory[us][major_piece_index(pos)];
     const auto  micv  = w.minorPieceCorrectionHistory[us][minor_piece_index(pos)];
     const auto  wnpcv = w.nonPawnCorrectionHistory[WHITE][us][non_pawn_index<WHITE>(pos)];
@@ -94,8 +93,7 @@ Value to_corrected_static_eval(Value v, const Worker& w, const Position& pos, St
         cntcv = int((*(ss - 2)->continuationCorrectionHistory)[pos.piece_on(m.to_sq())][m.to_sq()]);
 
     const auto cv =
-      (5932 * pcv + 2994 * mcv + 3269 * macv + 5660 * micv + 6237 * (wnpcv + bnpcv) + cntcv * 5555)
-      / 131072;
+      (5932 * pcv + 3269 * macv + 5660 * micv + 6666 * (wnpcv + bnpcv) + 5555 * cntcv) / 131072;
     v += cv;
     return std::clamp(v, VALUE_TB_LOSS_IN_MAX_PLY + 1, VALUE_TB_WIN_IN_MAX_PLY - 1);
 }
@@ -506,7 +504,6 @@ void Search::Worker::clear() {
     captureHistory.fill(-753);
     pawnHistory.fill(-1152);
     pawnCorrectionHistory.fill(0);
-    materialCorrectionHistory.fill(0);
     majorPieceCorrectionHistory.fill(0);
     minorPieceCorrectionHistory.fill(0);
     nonPawnCorrectionHistory[WHITE].fill(0);
@@ -1428,7 +1425,6 @@ Value Search::Worker::search(
                                 -CORRECTION_HISTORY_LIMIT / 4, CORRECTION_HISTORY_LIMIT / 4);
         thisThread->pawnCorrectionHistory[us][pawn_structure_index<Correction>(pos)]
           << bonus * 101 / 128;
-        thisThread->materialCorrectionHistory[us][material_index(pos)] << bonus * 99 / 128;
         thisThread->majorPieceCorrectionHistory[us][major_piece_index(pos)] << bonus * 157 / 128;
         thisThread->minorPieceCorrectionHistory[us][minor_piece_index(pos)] << bonus * 153 / 128;
         thisThread->nonPawnCorrectionHistory[WHITE][us][non_pawn_index<WHITE>(pos)]

src/search.h

@@ -287,7 +287,6 @@ class Worker {
     PawnHistory           pawnHistory;
 
     PawnCorrectionHistory         pawnCorrectionHistory;
-    MaterialCorrectionHistory     materialCorrectionHistory;
     MajorPieceCorrectionHistory   majorPieceCorrectionHistory;
     MinorPieceCorrectionHistory   minorPieceCorrectionHistory;
     NonPawnCorrectionHistory      nonPawnCorrectionHistory[COLOR_NB];