I went to the bowling alley today to bowl a couple games and noticed that the shot was completely different. I thought maybe it was the Viper, so I asked if it was a PBA pattern and I was told no. I work there so I asked the guy who oiled the lanes what the shot was. So come to find out the USBC came in today and they had to put down their "house shot". So he told me they had to change the pattern to make it USBC legal. This shot was a lot more difficult than the THS I have encountered. So what I got out of it is that most houses THS are illegal by USBC standards??? And if so, how do these bowling alleys get away with this.