Drill PokerTwenty blinds in the small blind is 82 hands, 41% of combos: any ace and any pair, suited kings from K3s, offsuit kings from K8o, queens from Q4s and Q9o, jacks from J5s and J9o, tens from T6s and T9o, 76s, 86s.
Push from SB, 20 BB stack
Even at a depth where the other positions shove 5–25% of hands, the small blind holds onto four hands in ten — that's how costly raise-folding is against a player with the closing position.
But 20 BB is the mark where the SB gets a real choice for the first time. Shoving twenty blinds to win one and a half is a blunt instrument: it's still profitable with this range, but a mixed strategy (raising the strong hands and part of the weak ones, limping the middle, shoving the hands that fear a re-shove) earns more in the long run — at the price of complexity. The practical rule: until you can play a limping strategy with confidence, shoving by the chart remains the error-free default; against an opponent who punishes limps with aggression, it's outright the best choice.
The boundary moved modestly against 15 BB: K6o–K7o, Q8o, J8o, T8o left. The core of "any ace plus wide paint" isn't touched even by the twenty. Deeper than this — switch to the opening ranges.