void GameBoard::place_knight(unsigned& row, unsigned& column)
{
  if(!tour)
  {
    board[row * columns_ + column] = moveNumber;
    ++moves;
    ++moveNumber;

    callback_(*this, &board[0], MSG_PLACING, moves, rows_, columns_, row, column);

    if(policy_ == tpSTATIC)
    {
      std::vector<position> staticNumbers;
      position temp = { -1, -1};
      std::fill(staticNumbers.begin(), staticNumbers.end(), temp);

      calculateMoves(row, column, staticNumbers);

      /*if(staticNumbers.size() == 0)
        callback_(*this, &board[0], MSG_FINISHED_FAIL, moves, rows_, columns_, row, column);*/

      for(unsigned i = 0; i < staticNumbers.size(); ++i)
      {
        place_knight(staticNumbers[i].y, staticNumbers[i].x);
        --moveNumber;
        board[staticNumbers[i].y * columns_ + staticNumbers[i].x] = 0;
        callback_(*this, &board[0], MSG_REMOVING, moves, rows_, columns_, row, column);
      }

    }

    //if(policy_ == tpHEURISTICS)

    if(moves == totalSquares)
    {
      tour = true;
      callback_(*this, &board[0], MSG_FINISHED_OK, moves, rows_, columns_, row, column);
    }

  }
}