Fastest checkmate by castling

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Superdinos8

How many moves a checkmate by castling requires ?

I have found so far that 7 are the least. But could it happen with 6 or 5 ?

Here is the example... 

https://www.chess.com/forum/view/game-showcase/checkmate-by-castling

And here are other checkmates by castling or really close attempts...

Mate by Castling (chessgames.com)

GavinT2013
Cool
GavinT2013
Hhhhhh
jgnLpaShalat

cool

1e4c6_O-1

6

jgnLpaShalat

very cool, nice

sukunaaa69

Nice

sukunaaa69

Cool

sukunaaa69

Veryyy cool

sukunaaa69

Trying this rn

sukunaaa69

happy.png))

tygxc

@12

There are many more ways to do it in 6 moves:

JoshuaJax

how do you checkmate with a castle