Doug Young’s routine.
According to a lot of sources, Doug Young would run three 4 week cycles for his bench. For the first four weeks, he would bench 4x6, AMRAP on the last set. For every rep above 6, he would add 5 pounds - for every rep under 6, he would remove 5 pounds. In this way it was almost autoregulating each session. For the second four weeks, he would alternate 4x6 and 5x3, AMRAP on the last set for both as before and adjusting accordingly. Finally the last four weeks he would do 5x3, AMRAP on the last set.
There are other variations where does triples, doubles, and singles in higher quantities and with different grips as well. Young tended to do a lot of bodybuilding movements as accessory work - 6x6 seems to be pretty common, though he preferred higher reps for lat raises and similar.
Young would bench 2-3x a week but would only supposedly squat once every 7-10 days and deadlift every 12-15 days, mostly just for singles. Some programs had him doing each once a week for 5-4-3-2-1, with the FIRST set being an AMRAP set and adding/removing 10 pounds per rep as above. He would then cycle down to triples, and then doubles.
Young competed primarily in the under-242 class.
Squat: 722.
Bench: 612.
Deadlift: 738.
Total: 2017.