Your position cannot be too good to double if you are playing the optional rule known as Jacoby, and if no one has doubled yet. This rule, invented by Oswald Jacoby, stipulates that no one can win a gammon unless a double has been given (by either side) and accepted. The object of the rule is to avoid those rather tedious games where one side is obviously going to win but plays on without doubling, hoping for a gammon. A side effect is that it tends to encourage people to give bad doubles!
• • •
