A backgame is a strategy of placing two or more anchors (points with two or more checkers) in one's opponent's home board, while building a prime in one's own home board. The anchors obstruct the opponent's checkers, and create opportunities to hit them as they move toward the home board. The backgame is generally used only to salvage a game wherein a player is already significantly behind; using a backgame as an initial strategy is usually unsuccessful.Duplication refers to the placement of checkers in such a way that advantageous dice rolls for one's opponent are the same for a number of desirable moves. For example, a player may position all of her blots in such a way that her opponent must roll a 2 in order to hit one, reducing the probability that any blot will be hit. Diversification refers to a complementary tactic of placing one's own checkers in such a way that more numbers are useful.
