When USBC in September announced its new rules for urethane (aka slow oil-absorbing high-performance) bowling balls to take effect Jan. 1, they included a hardness minimum of 78D for the USBC Open Championships. Not offered at the time was how USBC might enforce that rule. Those details came with Saturday’s start of the 2026 USBC Open Championships in the PDF attached to this story that is posted here. USBC calls it the “Squad Room Standard Operating Procedure for bowling ball...