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Some time ago, either in a published CV or in a discussion a new piece type
called 'area mover' or 'areal mover' was proposed here. It was kind of
a lame hook mover (known from large Shogi variants): It only could perform
a hook move when the whole area (defined as the rightangle spanned by the
two orthogonal rook moves) was free of intervening pieces.

I tried to google the reference, but it wasn't indexed.

Can someone remember the reference to this kind of piece?