Harder patterns. A lot of house shot leagues use 10:1 or even 12:1 oil rations which means there is 10 times the amount of oil in the middle of the lane that is used on the outside. This gives you miss room inside and especially outside once the pattern breaks down alittle, its dryer on the outside so if you throw it out there it helps it back... The oily center lane helps the ball hold if you tug one inside.
The house I used to practice at uses a 10:1 ratio and if you tug one inside and throw it straight up 15 by accident that's a strike almost everytime... The house I bowl at now uses a custom pattern which is similar to a typical house shot but a much lower ratio meaning misses inside aren't quite as forgiving.
Basically, they use sport patterns instead of Typical House Shots. PBA Experience Leagues are even harder as they use the oil patterns the pros play on... I'll get there one day lol.
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