When a screen is set, the two defenders trade assignments. The screener’s man picks up the ball, the ball’s man picks up the screener, and nobody has to fight through anything. It is the easiest coverage to teach and the hardest one to time wrong.
Why coaches use it
A switch removes the advantage the screen was built to create. There is no gap behind a hedge, no drop to shoot over, no chase to lose. Against a team that runs timing-heavy sets with staggers, flares and back screens, switching turns a beautifully drawn possession into five one-on-ones.
It is also the most forgiving coverage for a young team. There is nothing to remember and no rotation behind it, so nobody is ever out of position for the reason that they were late.
The cost is the mismatch. Switch a guard onto a big and somebody has to front the post or dig down. Switch a big onto a guard and he has to slide his feet twenty feet from the rim.
Some staffs switch only screens between similar-sized players, which they call “switch one through three” or “switch like sizes”. Ask which one is meant before you write it on a scouting report.
How to attack it
- Hunt the mismatch immediately. The advantage is largest in the two seconds before help arrives. Post the small man or attack the slow one off the catch.
- Slip or ghost the screen. Leave before contact and the two defenders switch onto nobody, which gives the screener a free lane.
- Back screen it. A switch on a back screen leaves a guard behind a big at the rim, which is the whole idea of a rip to the basket.
- Stack two screens. Spain and double drag force two switches in a row, and the second one is usually late.