Hnefatafl - tactics and strategy

Another draw fort...the "Two Towers"

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In this position, white is completely surrounded, but has two unbreakable towers (four pieces in a square) each guarding, but not enclosing, a square for the king to move to. Try it out on a hnefatafl board - there's no way black can break this up, as long as white moves only the king. Notice that this wouldn't work with only one tower - white requires both!