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Partly keeping close to standard Chess, partly the trivial reason of
symmetry within as well as between armies. In retrospect the latter is
fairly trivial as the initial f1xg2 and g1xf2 could not be replicated
except by wraparound. My question was out of curiosiy rather than
criticism, and if moving further from standard Chess improves the game,
well done.
	By the way, the game really fits its name. It conveys well the idea of
warriors heading off into frozen northern wastes, as much competing to
best fight the common enemy of the elements as fighting each other. Many
games fit their names less well.