We are living the age of the 3-pointer in college basketball. Teams are shooting more 3s than ever before, and the trend doesn’t look to be slowing down any time soon.

But what can defenses do to combat it? Switching on defense is one tactic that’s becoming more and more popular; Villanova and Michigan, the final two teams standing last year, employed switch-heavy defenses most of the season.

Here are six things to know about the defensive strategy that’s taking college hoops by storm.

If done effectively, switching forces offenses into isolation basketball

Isolation offense is the anti-pace-and-space. Most offenses these days want to penetrate, cause the defense to help, kick out to an open shooter and swing the ball around the perimeter.

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Switching negates that strategy, if done properly. The best tactic against a switch is to exploit a mismatch. For example, if a point guard and a center are involved in a ball-screen action, a switch would mean a point guard is guarding a center and a center is guarding a point guard.

Those sound like tasty matchups. Sometimes, they are. But get a mobile big man who can hang with a smaller guy on a switch or a tough defensive point guard who can harass a center, and you can force opponents into bad, uncharacteristic shots.

Check out this possession in a Villanova-Gonzaga game from last year as an example. The Wildcats had two of the most switchable defenders in the country in Mikal Bridges and Eric Paschall. Villanova switches every action here, and it takes Gonzaga six passes to go essentially… well, nowhere. Josh Perkins is forced to take a heavily-contested shot because the Bulldogs can’t find a crease.