In addition, two changes should be discussed prior to merging:
I have retabbed the file with 4-space indents. Previously it was mixed tab- and space- indented.
I have arbitrarily created lost and gained keys for defense objects, which hold the game lines received when the defense is lost or raised, respectively. I'd suggest lost be kept for keepup purposes, etc; gained might not be necessary but could be kept for sake of completion/posterity.
Acrobatics defenses are included in this PR.
In addition, two changes should be discussed prior to merging: