Be very careful about doubling when you have a good lead and are close to victory. Suppose you lead 13-11, playing up to 15. You should be much more inclined to play for a gammon than to double. The reason is that, if Black accepts, he will redouble you to 4 immediately and play this game for match. Winning 4 points rather than 2 won't help you at all. Losing 4 will cost you the match. This principle applies at earlier stages, too. Suppose you lead 11-7 in a match up to 15 and it is one of those games that could be a gammon either way. You need a very considerable advantage to justify you in doubling. Black will probably redouble to 4, if he accepts, and then if it is you who lose a gammon, you lose the match with it.
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