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Il Vaticano is a special chess move, which allows bishops two squares apart to take what's in between them. It's denoted B-O-O-B in standard chess notation.
"what the fuck"
"google Il Vaticano"
"Holy See"
a chess move in which two bishops of the same color on the same rank or file with two spaces in between them occupied by pieces can swap places and remove the pieces between them.
this was invented by the subreddit r/anarchychess.
OH NO!!! Hans Niemann used Il Vaticano against Magnus Carlsen practically winning the game.