Line data    Source code

       1              : #include "moveGen.hpp"
       2              : 
       3              : #include "dynamicConfig.hpp"
       4              : #include "logging.hpp"
       5              : #include "material.hpp"
       6              : #include "moveApply.hpp"
       7              : #include "positionTools.hpp"
       8              : #include "searcher.hpp"
       9              : #include "tools.hpp"
      10              : 
      11           46 : ScoreType randomMover(const Position& p, PVList& pv, const bool isInCheck) {
      12           46 :    MoveList moves;
      13           46 :    MoveGen::generate<MoveGen::GP_all>(p, moves, false);
      14           46 :    if (moves.empty()) return isInCheck ? matedScore(0) : 0;
      15              :    ///@todo this is slow because the static here implies a guard variable !!
      16           46 :    static std::random_device rd;
      17           48 :    static std::mt19937       g(rd()); // here really random
      18              :    std::ranges::shuffle(moves, g);
      19           46 :    for (const auto & it : moves) {
      20           46 :       Position p2 = p;
      21              : #if defined(WITH_NNUE) && defined(DEBUG_NNUE_UPDATE)
      22              :       NNUEEvaluator evaluator = p.evaluator();
      23              :       p2.associateEvaluator(evaluator);
      24              : #endif
      25           46 :       if (const MoveInfo moveInfo(p2, it); !applyMove(p2, moveInfo)) continue;
      26           46 :       pv.emplace_back(it); // updatePV
      27           46 :       const Square to = Move2To(it);
      28              :       // king capture (works only for most standard chess variants)
      29           46 :       if (p.c == Co_White && to == p.king[Co_Black]) return matingScore(0);
      30           46 :       if (p.c == Co_Black && to == p.king[Co_White]) return matingScore(0);
      31              :       return 0; // found one valid move
      32           46 :    }
      33              :    // no move is valid ...
      34            0 :    return isInCheck ? matedScore(0) : 0;
      35              : }