The size of your four-bet is practically irrelevant for this purpose. Even if your small four-bet does not elicit many folds from the three-better, you still benefit from fold equity by pushing the original raiser off the lion’s share of their opening range. Fold equity from the original raiser subsidizes a cold four-bet.Even pairs like TT or JJ will not feel great stacking off on low boards because of the prevalence of bigger pairs in the four-better’s range. They must also consider the risk of further betting after the flop, and with such a low SPR, they cannot set mine or chase other long shots. A three-bettor facing a cold four-bet cannot make their calling decisions based on pot odds alone. Any four-bet, no matter how small, leverages the remaining stacks to achieve disproportionate fold equity.This means your strongest hands–your big pocket pairs–do not need large four-bets to grow the pot, as they will be able to stack off comfortably on most flops regardless.

A small four-bet suffices to achieve a low SPR on the flop, even if the effective stack is 100bb.

Poker tournament 3 bet call range