What is the fewest number of White chess pieces from the start of a game, that can be placed on a standard chessboard in order to make it impossible to place a Black piece on the board that is not under attack?

Remember,
The final answer must be a subset of the original starting pieces, i.e. only 1 queen, 2 rooks, etc.
Bishops should be on different colour squares.
It is not necessary to attack squares with white pieces on them, as the black piece cannot share a square.

(In reply to re: The best I could come up with by nikki)

That pawn is not attacking a square that is not under attack by another piece but it is covering a square that is not under attack. Which means that if you remove that pawn a black piece can be put there safely.

Posted by Danny on 2004-08-31 17:41:44