Drill PokerFifteen blinds on the cutoff is 46 hands, almost 21% of combos: every pair, suited aces from A3s, offsuit aces from ATo, kings from K8s and KTo, queens from Q8s, QJo, JTs, T9s, J8s.
Push from CO, 15 BB stack
Unlike the early positions, where the shove nearly dies out at 15 BB, the cutoff keeps a wide working range — that's what having only three players behind you does. But the choice of line is now twofold. The top (99+, AQ+) opens with a raise more often: those hands are strong enough to welcome a 3-bet. The middle and bottom of the list — small pairs, A3s–A9s, KTo, QJo — are shove material: raise-folding them gifts the blinds too much, and calling a 3-bet is out of the question.
An entertaining boundary detail: KTo is in the range while QTo and JTo are not, though at 10 BB both shoved. The king blocker cuts the number of dominating hands your opponents can hold — at a longer stack, that already carries a price.
If there was a raise in front of you, apply not this chart but the re-shove logic from the 15 BB page: against an open, the all-in range is built from the raiser's range.