shelter_file      130 src/eval.cpp   static int  shelter_file       (const board_t * board, int file, int rank, int colour);
shelter_file     1797 src/eval.cpp      penalty += shelter_file(board,file,rank,colour) * 2;
shelter_file     1798 src/eval.cpp      if (file != FileA) penalty += shelter_file(board,file-1,rank,colour);
shelter_file     1799 src/eval.cpp      if (file != FileH) penalty += shelter_file(board,file+1,rank,colour);