Everyone is different but I'd agree with a
couple of points in the forum.
1) You have got to be positive and
committed (hard with a little chip on a
fast slopy green I know!).
2) Moving the ball back in the stance is
great if you haven't got anything to
obstruct the path of the ball. As most
duffs come from the club head sliding
under the ball, this makes you strike
down on the ball a bit. Can also be
useful as it gives greater
control...less room for error if you
are not trying to lob the ball up in
the air, and it can exrt a bit of spin
to control the roll.
For the really short ones on the fringe use the old putting stroke technigue with your sand wedge or with a longer iron for less loft and greater roll.