Complete as many rounds and reps as possible in 4 minutes of:
15 Thrusters (45/29 kg)
15 Chest-to-bar Pull-ups

If 90 reps (3 rounds) are completed in under 4 minutes, time extends to 8 minutes.
If 180 reps (6 rounds) are completed in under 8 minutes, time extends to 12 minutes.
If 270 reps (9 rounds) are completed in under 12 minutes, time extends to 16 minutes.
Etc.