When the auction starts with an opening bid at the 1-level and two passes, GIB defines the single jump overcall as 13+ with twice rebiddable suit and the double jump overcall as 17+ with a strong 7+ suit. I was unable to generate hands where GIB would use these bids. Instead there seems to be no upper limit for the 1-level overcall in balancing seat. http://tinyurl.com/c9n6dcc but http://tinyurl.com/d6ol8ey These occurred Sunday, April 07, 2013 at a teaching table in the Main Bridge Club with advanced robots.