The Celtics famously had only 6 plays (plus one for Russell). Finding them isn't like finding a needle in a haystack; it's more like finding a needle in a needlestack.
Here's Play 3. If you've see the prior posts, the initial plays run off either high post scissors-like action or a split. Play 3 continues that theme.
I think of it as more of a "blind pig" like look. Depending on how the X2 defender approaches defending, you might get different actions. Depending on how good a shooter 2 is will often define how X2 reacts. And, of course, you have the opposite side double screen wherein 3 has 'emptied' the ball side.