Drill PokerThe cutoff with ten blinds is 57 hands, 28% of combos: every pair, any suited ace, offsuit aces from A5o, kings from K6s and KTo, queens from Q8s, plus QTo, JTo, JTs, T9s, 98s and J8s.
Push from CO, 10 BB stack
Ten on the cutoff is where two boundaries meet that are worth knowing by heart.
The first is offsuit aces: shove from A5o up, fold A4o and below. Players often draw the line "from A7o", trimming too much: A5o and A6o are full-fledged shoves, and the five even carries wheel straight potential.
The second is the "nine-kicker" hands: K9o, Q9o, J9o, T9o are folds, while T9s and 98s shove. At this mark the suit is worth exactly the distance between profit and loss.
Compare with the neighbours: at 8 BB K5s and Q6s would come back into the shove; at 15 BB A5o, QTo and JTo drop out. Five blinds in either direction moves the boundary noticeably — while the middle of the range (pairs, big aces) doesn't change at all: mistakes live only at the edges.