a mating position in which the mated king and all vacant squares in its field are attacked only once, and squares in the king's field occupied by friendly units are not also attacked by the mating side (unless such a unit is necessarily pinned to the king to avoid it interposing to block the check).
Found on
http://en.wikipedia.org/wiki/Chess_problem_terminology
Such a mate occurred in the Evergreen Game between Adolf Anderssen and Jean Dufresne in 1852; the final position is shown to the right. The black king is attacked only by the bishop on e7; the e7 and g7 squares are attacked only by the pawn on f6; the e8 square is attacked only by the bishop on d7; and the rook on g8 and pawn on f7 which stop the ...
Found on
http://en.wikipedia.org/wiki/Pure_mate
No exact match found.
