Team USA tips: How to bowl medium patterns October 12, 2011 Bowling in official WTBA international competition means bowling on some of the most challenging lane conditions in the sport. There are 12 oil patterns that make up today’s international game - four shorter, four medium length and four longer. In the following videos, Team USA bowlers give you their tips and plan of attack on the four medium-length international patterns. (Click on name to see video).Atlanta Pattern Tips (38 feet)Carolyn Dorin-BallardShannon PluhowskyChris BarnesShannon O'KeefeSeoul Pattern Tips (39 feet)Carolyn Dorin-BallardChris BarnesAthens Pattern Tips (40 feet)Shannon PluhowskyLiz JohnsonChris BarnesShannon O'KeefeMontreal Pattern Tips (41 feet)Chris Barnes