As we know, castling is a legal "double move," where two pieces are moved at once.
But in my country, Indonesia, in my childhood, the opening below was an 'assumed legal' double move to counter
1.e4 and similar openings.
[FEN "rnbqkbnr/p1pppp1p/1p1111p1/8/4P3/8/PPPP1PPP/RNBQKBNR - - - 0 0 "]
As I understand, this opening is an illegal double move. (Someone can help me with the FIDE rule.)
I would like to know, though, are such double moves played in any other place in the world??