Putt off a downslope: ball back with forward shaft lean
When putting off a firm bare downslope (where a normal putt would sit off the left heel), move the ball back of center with some forward shaft lean. That encourages the putter to travel up and then down into the ball, which is what the downslope needs.
Channel: Dan Grieve
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Using a putter from a bare firm downslope just off the green.