I typically don't like to have to study before watching a race. It shouldn't be that complicated.
If you can't comprehend this after one read through, I pity you:
THE RULES, SEGMENT 1
The lineup for Segment 1 is determined by qualifying run earlier Saturday night.
There is a mandatory green-flag pit stop for a minimum of two tires (teams can choose to take two or four) during the opening 50 laps.
After Segment 1, there is a 3-5 minute break. Cars
must pit and take a minimum of two tires.
THE RULES, SEGMENT 2
The starting order for Segment 2 is set by the pit-road exit from the mandatory pit stop after Segment 1.
During Segment 2, there is a mandatory green-flag pit stop for a minimum of two tires during this set of 50 laps. The twist here is that the pit stop must occur before Lap 85.
After Segment 2 concludes, there is another 3-5 minute break.
THE RULES, SEGMENT 3
During the break between Segments 2 and 3, there is a random drawing in which the number 9, 10 or 11 is selected. That number determines the number of cars from the 20-car field (starting from whoever is leading the race) which must pit for a mandatory four-tire stop. Pit road is closed to the additional cars.
Those who did not pit will be on older tires and at the front of the field. The order off pit road sets the running order behind those cars. So it will be older tires at the front and fresher tires (and likely faster cars) at the rear. Plenty of strategy to be had.
Only green-flag laps count in Segment 3, and NASCAR Overtime procedures apply.