 Complete the following phrase:  The season opened with the 1981 Indianapolis 500 at the Indianapolis Motor Speedway and Bobby Unser would win. Wally Dallenbach Sr. qualified the 40 car for Mario Andretti. However, after the race USAC officials penalized Unser 1 position and the win went to Andretti. Even if Andretti failed to win he would still go into the Van Scoy Diamond Mines 500 at Pocono International Raceway as the points leader as he was in possession of a USAC Class 1 License. The Van Scoy Diamond Mines 500 was won by A. J. Foyt getting Foyt his 67th and final USAC Gold Crown win. The race was cut from 500 miles down to 305 miles due to rain. At the Tony Bettenhausen 100 at the Illinois State Fairgrounds was won by George Snider for his first and only win in USAC Gold Crown competition. At the DuQuoin State Fairgrounds Rich Vogler would win his first and only race in USAC Gold Crown competition. At the Hoosier Hundred at the Indiana State Fairgrounds Larry Rice would win his only USAC Gold Crown race. The 