Remove pawn history from ProbCut constructor

use same style as other history tables

Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 184672 W: 46953 L: 46896 D: 90823
Ptnml(0-2): 604, 21095, 48887, 21140, 610
https://tests.stockfishchess.org/tests/view/654766b4136acbc573526602

closes https://github.com/official-stockfish/Stockfish/pull/4865

No functional change

src/movepick.cpp

@@ -89,7 +89,7 @@ MovePicker::MovePicker(const Position&              p,
                        const ButterflyHistory*      mh,
                        const CapturePieceToHistory* cph,
                        const PieceToHistory**       ch,
-                       const PawnHistory&           ph,
+                       const PawnHistory*           ph,
                        Move                         cm,
                        const Move*                  killers) :
     pos(p),
@@ -112,7 +112,7 @@ MovePicker::MovePicker(const Position&              p,
                        const ButterflyHistory*      mh,
                        const CapturePieceToHistory* cph,
                        const PieceToHistory**       ch,
-                       const PawnHistory&           ph,
+                       const PawnHistory*           ph,
                        Square                       rs) :
     pos(p),
     mainHistory(mh),
@@ -129,11 +129,9 @@ MovePicker::MovePicker(const Position&              p,
 
 // Constructor for ProbCut: we generate captures with SEE greater
 // than or equal to the given threshold.
-MovePicker::MovePicker(
+MovePicker::MovePicker(const Position& p, Move ttm, Value th, const CapturePieceToHistory* cph) :
-  const Position& p, Move ttm, Value th, const CapturePieceToHistory* cph, const PawnHistory& ph) :
     pos(p),
     captureHistory(cph),
-    pawnHistory(ph),
     ttMove(ttm),
     threshold(th) {
     assert(!pos.checkers());
@@ -188,6 +186,7 @@ void MovePicker::score() {
             m.value += (*continuationHistory[2])[pc][to] / 4;
             m.value += (*continuationHistory[3])[pc][to];
             m.value += (*continuationHistory[5])[pc][to];
+            m.value += (*pawnHistory)[pawn_structure(pos)][pc][to];
 
             // bonus for checks
             m.value += bool(pos.check_squares(pt) & to) * 16384;
@@ -209,8 +208,6 @@ void MovePicker::score() {
                           : pt != PAWN ? bool(to & threatenedByPawn) * 15000
                                        : 0)
                        : 0;
-
-            m.value += pawnHistory[pawn_structure(pos)][pc][to];
         }
 
         else  // Type == EVASIONS
@@ -221,7 +218,7 @@ void MovePicker::score() {
             else
                 m.value = (*mainHistory)[pos.side_to_move()][from_to(m)]
                         + (*continuationHistory[0])[pos.moved_piece(m)][to_sq(m)]
-                        + pawnHistory[pawn_structure(pos)][pos.moved_piece(m)][to_sq(m)];
+                        + (*pawnHistory)[pawn_structure(pos)][pos.moved_piece(m)][to_sq(m)];
         }
 }
 

src/movepick.h

@@ -144,7 +144,7 @@ class MovePicker {
                const ButterflyHistory*,
                const CapturePieceToHistory*,
                const PieceToHistory**,
-               const PawnHistory&,
+               const PawnHistory*,
                Move,
                const Move*);
     MovePicker(const Position&,
@@ -153,9 +153,9 @@ class MovePicker {
                const ButterflyHistory*,
                const CapturePieceToHistory*,
                const PieceToHistory**,
-               const PawnHistory&,
+               const PawnHistory*,
                Square);
-    MovePicker(const Position&, Move, Value, const CapturePieceToHistory*, const PawnHistory&);
+    MovePicker(const Position&, Move, Value, const CapturePieceToHistory*);
     Move next_move(bool skipQuiets = false);
 
    private:
@@ -170,7 +170,7 @@ class MovePicker {
     const ButterflyHistory*      mainHistory;
     const CapturePieceToHistory* captureHistory;
     const PieceToHistory**       continuationHistory;
-    const PawnHistory&           pawnHistory;
+    const PawnHistory*           pawnHistory;
     Move                         ttMove;
     ExtMove                      refutations[3], *cur, *endMoves, *endBadCaptures;
     int                          stage;

src/search.cpp

@@ -855,8 +855,7 @@ Value search(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth, boo
     {
         assert(probCutBeta < VALUE_INFINITE);
 
-        MovePicker mp(pos, ttMove, probCutBeta - ss->staticEval, &captureHistory,
+        MovePicker mp(pos, ttMove, probCutBeta - ss->staticEval, &captureHistory);
-                      thisThread->pawnHistory);
 
         while ((move = mp.next_move()) != MOVE_NONE)
             if (move != excludedMove && pos.legal(move))
@@ -915,7 +914,7 @@ moves_loop:  // When in check, search starts here
       prevSq != SQ_NONE ? thisThread->counterMoves[pos.piece_on(prevSq)][prevSq] : MOVE_NONE;
 
     MovePicker mp(pos, ttMove, depth, &thisThread->mainHistory, &captureHistory, contHist,
-                  thisThread->pawnHistory, countermove, ss->killers);
+                  &thisThread->pawnHistory, countermove, ss->killers);
 
     value            = bestValue;
     moveCountPruning = singularQuietLMR = false;
@@ -1484,7 +1483,7 @@ Value qsearch(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth) {
     // will be generated.
     Square     prevSq = is_ok((ss - 1)->currentMove) ? to_sq((ss - 1)->currentMove) : SQ_NONE;
     MovePicker mp(pos, ttMove, depth, &thisThread->mainHistory, &thisThread->captureHistory,
-                  contHist, thisThread->pawnHistory, prevSq);
+                  contHist, &thisThread->pawnHistory, prevSq);
 
     int quietCheckEvasions = 0;