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Belfort

In a proof game, at least two units stand on the home square of a similar unit of the other colour.

It must be at least two: "Eine Schwalbe macht noch keinen Sommer" The metaphor of Belfort units as North-South migrated birds is charming.

The "Belfort (Champagne)" theme is named after the location of the 1994 FIDE Congress. There is a regular Champagne Tourney (themed composition tourney for proof games) held at these congresses.

If ALL units stand the home square of a similar unit of either colour, this can be known as "home-and-away-base" - as long as at least one unit is on the other colour. So this is "extreme Belfort". A homebase problem (of which there are many) is *not* a "home-and-away-base" - there must be at least one "away" unit.

No proof game is currently known where ALL units stand on the home square of a similar unit of the other colour "awaybase". Some helpmates have been constructed with this form.