Supreme Court Justice Elena Kagan has disagreed with Justice Samuel Alito Jr. in 35 percent of the cases decided so far this term, more than she has differed with any other justice. On June 20, they even disagreed about the board game Clue.

The case was Descamps v. United States, and the issue was how to categorize a defendant’s prior conviction for the purpose of enhancing a sentence under the Armed Career Criminal Act.