BORDER
sp->s_occ = BORDER; /* bottom border and corners */
sp->s_occ = BORDER; /* combined left and right border */
sp->s_occ = BORDER; /* top border and top-right corner */
if (spb0->s_occ == BORDER)
if (fsp->s_occ == BORDER)
if (sp->s_occ == BORDER)
if (board[s1].s_occ == BORDER)
if (board[s2].s_occ == BORDER)
if (fsp->s_occ == BORDER)