X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fsearch.cpp;h=85d702c4d4c410e0eb4e5eb045977c6d891e5114;hb=83a574ff271ec5924976b48cf65ac62278f87558;hp=06546f99d038d7942162de2a2bf3d60eeeab3d9a;hpb=40f5abba104b411ec5234e2c93b05bba8e6bd3c8;p=stockfish

diff --git a/src/search.cpp b/src/search.cpp
index 06546f99..85d702c4 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -25,11 +25,11 @@
 #include <iostream>
 #include <sstream>
 
-#include "book.h"
 #include "evaluate.h"
 #include "movegen.h"
 #include "movepick.h"
 #include "notation.h"
+#include "rkiss.h"
 #include "search.h"
 #include "timeman.h"
 #include "thread.h"
@@ -42,6 +42,7 @@ namespace Search {
   LimitsType Limits;
   std::vector<RootMove> RootMoves;
   Position RootPos;
+  Color RootColor;
   Time::point SearchTime;
   StateStackPtr SetupStates;
 }
@@ -179,13 +180,12 @@ uint64_t Search::perft(Position& pos, Depth depth) {
 
 void Search::think() {
 
-  static PolyglotBook book; // Defined static to initialize the PRNG only once
-
-  TimeMgr.init(Limits, RootPos.game_ply(), RootPos.side_to_move());
+  RootColor = RootPos.side_to_move();
+  TimeMgr.init(Limits, RootPos.game_ply(), RootColor);
 
   int cf = Options["Contempt Factor"] * PawnValueEg / 100; // From centipawns
-  DrawValue[ RootPos.side_to_move()] = VALUE_DRAW - Value(cf);
-  DrawValue[~RootPos.side_to_move()] = VALUE_DRAW + Value(cf);
+  DrawValue[ RootColor] = VALUE_DRAW - Value(cf);
+  DrawValue[~RootColor] = VALUE_DRAW + Value(cf);
 
   if (RootMoves.empty())
   {
@@ -197,25 +197,14 @@ void Search::think() {
       goto finalize;
   }
 
-  if (Options["OwnBook"] && !Limits.infinite && !Limits.mate)
-  {
-      Move bookMove = book.probe(RootPos, Options["Book File"], Options["Best Book Move"]);
-
-      if (bookMove && std::count(RootMoves.begin(), RootMoves.end(), bookMove))
-      {
-          std::swap(RootMoves[0], *std::find(RootMoves.begin(), RootMoves.end(), bookMove));
-          goto finalize;
-      }
-  }
-
   if (Options["Write Search Log"])
   {
       Log log(Options["Search Log Filename"]);
       log << "\nSearching: "  << RootPos.fen()
           << "\ninfinite: "   << Limits.infinite
           << " ponder: "      << Limits.ponder
-          << " time: "        << Limits.time[RootPos.side_to_move()]
-          << " increment: "   << Limits.inc[RootPos.side_to_move()]
+          << " time: "        << Limits.time[RootColor]
+          << " increment: "   << Limits.inc[RootColor]
           << " moves to go: " << Limits.movestogo
           << "\n" << std::endl;
   }
@@ -879,6 +868,12 @@ moves_loop: // When in check and at SpNode search starts from here
           if (move == countermoves[0] || move == countermoves[1])
               ss->reduction = std::max(DEPTH_ZERO, ss->reduction - ONE_PLY);
 
+          // Decrease reduction for moves that escape a capture
+          if (   ss->reduction
+              && type_of(pos.piece_on(to_sq(move))) != PAWN
+              && pos.see_sign(make_move(to_sq(move), from_sq(move))) < 0)
+              ss->reduction = std::max(DEPTH_ZERO, ss->reduction - ONE_PLY);
+
           Depth d = std::max(newDepth - ss->reduction, ONE_PLY);
           if (SpNode)
               alpha = splitPoint->alpha;