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I can see why that only appeared in 7 games. It's pretty rare to see a rook in between a king and another rook that are otherwise legally able to castle. Even rarer for someone to get into that position and actually try to castle.

Also that linked game is pretty entertaining. It's not a good game, but it can be fun watching lower ranked players make moves that you'd never see in higher level games. Like, who plays Bb5+ against the Scandinavian? Amazing stuff.

Wouldn't the bug with queen side castling end up with _ _ K R _ _ _ _?

Wow it just ate the rook huh?

seriously...how'd it vanish?