With Donald Trump’s defeat in Ohio on March 15, Trump’s opponents now have a plausible path to holding him to fewer than 1,100 delegates in the GOP presidential race—well short of the majority (1,237 delegates) required by the rules to win the Republican nomination.

What would it take to keep Trump under 1,100 delegates? One scenario would involve defeating Trump in key states in the Midwest and the West: Utah on March 22, Wisconsin on April 5, Indiana on May 3, and Nebraska on May 10.