Don't count only your hand. Give up a few points if it enhances the chance to improve both hand and crib.
Usually hold a run, even at the expense of 15s. Runs have the best chance of improving.
With poor scoring hands, save low cards that may count for you in play.
Always consider the great likelihood that a 10-point card will be the starter.
LAYING AWAY (late in game)
With hand sure to go out, sacrifice count, if necessary, in order to keep down opponent's score in the play. Your hand counts first.
If dealer is sure to win, given a chance to count, sacrifice points in your hand if it will give you a chance at a big score with a lucky starter.
Don't break up your hand to avoid giving good cards to opponent's crib.