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The double-cross strategy applies however many long chains there are.
Take all but two of the boxes in each chain, but take all the boxes in the last chain.
If the chains are long enough then the player will certainly win.
Therefore, when played by experts, Dots and Boxes becomes a battle for control: An expert player tries to force their opponent to start the first long chain.
Against a player who doesn't understand the concept of a sacrifice, the expert simply has to make the correct number of sacrifices to encourage the opponent to hand him the first chain long enough to ensure a win.
If the other player also knows to offer sacrifices, the expert also has to manipulate the number of available sacrifices through earlier play.

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