Way back in the dark ages, in 1977, I bought a yellow dot for use in the national tournament, and I had made it clear to the pro shop operator that I was buying the ball for that purpose. Nonetheless, when I got to Reno and the ball was checked by ABC officials, it was too soft (by 4 or 5 durometer points) for use in the tournament. Therefore, I took the ball about 3,000 miles to bowl in the tournament and had to bring it back but wasn't even able to use it in sanctioned competition. I have to blame the pro shop operator as much as the ball manufacturer, though.