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[In the past, there has been comparison of choices (as many as 3,4,5) for promotion of Pawn to choices (as many as 3,4,5) for location of King and Rook in free castling, new or old.] Falcon Chess invented modern free castling, different from Italian Free Castling. The latter is explained in ''Bring Back Free Castling'' by Tim Harding, linked below this thread by Paulowich. Any Castling at all is rare so far in Falcon Chess. For example, in Game Courier logs, where free castling is now King two or more over and Rook over adjacent, there is only 1 castling at all in over 25 games. Too much is going on too quickly to bother to castle. The two alternatives (similar to recent remarks here for other CVs) in 1996 copyrights for Falcon Chess are: King one or more, and King two or more, and both cases Rook must end adjacent -- unlike what was called ''free castling'' in 8x8 through 19th Century. '8x8' does not lend itself to very many choices to switch King and Rook simultaneously in Castle. Offhand, there may be only one CV in 1994 Pritchard's 'ECV' describing castling to multiple locations as ''2,3, or 4 over'' for King on 12x12, therefore not being inclusive of all squares between Rook and King on 12x12. So, modern free castling is new idea used in Grotesque, Sam Trenholme's Schoolbook, Birds & Ninja etc. Ultimately, consensus of players should decide what exact castling form they want from trials, if any CV becomes played enough.