cdef get_black(int id, float x, float y) => BLACK_TAG(id, y, x)
cdef get_white(int id, float x, float y) => WHITE_TAG(id, y, x)
cdef black_stone(int id, int x, int y)
     id {outline_color black_color x y stone} sendcidevent
cdef white_stone(int id, int x, int y)
     id {outline_color white_color x y stone} sendcidevent
cdef cross(int id, int x, int y)
     id {x y cross} sendcidevent