2 defending players makes the combinations more relevant and the backcourt players learn to protect the ball.
The backcourt attack with a direct cross (ordinary), but it can also be practiced with a shooting feint at first.
Normally CB passes to the wing, who passes across the field. 
Afterward the opposite side is trained.
The defending backcourt must make a press the attacking backcourt as well as the CB in the cross and the pass.
The backcourt must also be trained in passing to the opposite backcourt which is a real playing possibility in a game situation.