Originally posted by leisurelysloth
"old rule" ??
Apparently in 1903 or 1904, in a Master's game, one of the players castled using a promoted pawn turned into a rook on e8 and a king on e1.
The Rook ended up on e2 and the King on e3.
Because the Rook on e8 and the King on e1 had never moved they were able to castle under the rules as written at the time. This was an unintended consequence of a poorly written rule and the rule was quickly re-written.
I would love to see the game in question, as it is hard to imagine the situation where it would make sense.