Question Power Attack and Overhand Chop

[methanos]

I need some help figuring this out.
I am 3rd level fighter with 20 strength using Great Sword.
I need to know my total damage bonus if I do a full power attack WITH overhand chop.
2d6+?
Herolab doesn't have overhand chop so I can't just add it and click on it to use in play.

[Martuch]

2d6 + 13

+10 from double your strength modifier (through overhand chop)
+3 from your power attack