Improvde MultiPV - no functional change official-stockfish#2163

src/Makefile

@@ -46,7 +46,7 @@ RELEASE = no
 RELVERSION = 
 
 ### Uncomment the line below for Honey, comment out for Stockfish
-###	VERSION=sullivan
+	VERSION=sullivan
 
 ### Uncomment for use with Raspberry Pi -  a slower NPS UCI option setting used in Play
 ### by Elo and personalities

src/search.cpp

@@ -541,8 +541,11 @@ ss->pv = pv;
 #endif
 
   beta = VALUE_INFINITE;
-
+#ifdef Sullivan //Improve multiPV mode #2163 by Joerg Oster
+  multiPV = Options["MultiPV"];
+#else
   size_t multiPV = Options["MultiPV"];
+#endif
   Skill skill(Options["Skill Level"]);
 
 #ifdef Sullivan //zugzwangMates by Gunther Dementz
@@ -1415,6 +1418,14 @@ namespace {
           sync_cout << "info depth " << depth / ONE_PLY
                     << " currmove " << UCI::move(move, pos.is_chess960())
                     << " currmovenumber " << moveCount + thisThread->pvIdx << sync_endl;
+#ifdef Sullivan  //  Improve multiPV mode #2163 by Joerg Oster
+      // In MultiPV mode also skip moves which will be searched later as PV moves
+     //  this section updated by mstembera
+     if (   rootNode
+         && std::find(thisThread->rootMoves.begin() + thisThread->pvIdx, thisThread->rootMoves.begin() + thisThread->pvLast, move)
+             == thisThread->rootMoves.begin() + thisThread->pvLast)
+          continue;
+#endif
       if (PvNode)
           (ss+1)->pv = nullptr;
 

src/thread.h

@@ -62,12 +62,13 @@ class Thread {
 
   Pawns::Table pawnsTable;
   Material::Table materialTable;
-  size_t pvIdx, pvLast;
 
-#ifdef Sullivan //  Gunther Demetz zugzwangSolver
-  int selDepth, nmpMinPly, zugzwangMates;
+#ifdef Sullivan
+  size_t pvIdx, multiPV, pvLast;  // Improve multiPV mode by joergoster
+  int selDepth, nmpMinPly, zugzwangMates; //  Gunther Demetz zugzwangSolver
   int64_t visits, allScores; //  Moez Jellouli -> Save_probcut #e05dc73
 #else
+  size_t pvIdx, pvLast;
   int selDepth, nmpMinPly;   
 #endif