Jeff,
After looking at your article on chopping out dovetails, I reviewed my
videos of Tage Frid and Frank Klausz. I noticed that, when making his
first chop, Frank starts a little bit in front of the scribed base
line, allowing for the fact that the chisel will be forced back into
the line. His subsequent chops are made with the bevel facing the base
line. The chops are not made straight down, however. The chisel is
held at about 30 degrees from vertical. This method forces the waste
up and out of the cut rather than compressing the wood as is shown in
your demonstration.

Dick Durbin