There seems to be lots of examples of redans, so what is the definition? What truly defines a redan? The fall away on the back of the green?
I assume the basis for all redans is Berwick, so I assume that would be the model for the definition.
As for Ian's diagram of Toronto's fine fourth hole, I'll let you know that a high cut 5-iron can put the ball to a few feet where upon one can make birdie. Otherwise, a fade to the right side, even off the green, leaves a fair chip and a good shot at par.
Robert