Why Did Morphy Move His KIng This Move?

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Master_Po

On move 17, why did he move his King?  (afterwards is the rest of the game) 

urk
He wanted to make his rook on f1 more active by putting it on the semi-open g-file.
But as it turned out, he did use the f-file to break through.
PlayChessPoorly
To make way for rook g-1.
PlayChessPoorly
Also as urk said the f -file opened and rook g-1 was no longer needed.