Part: Part Five - Betting Before the Flop

Open-shoving a short stack

Pre-flop
Blinds 100 / 200Pot 300 (1.5 BB)COA♠10♦● 2,000 (10 BB)YOU10 BB stackSB● 25,000 (125 BB)posts 100 (0.5 BB)BB● 25,000 (125 BB)posts 200 (1 BB)D

You have a 10 BB stack and it folds to you on the cutoff with A♠T♦.

10 BB deep, folded to you on the cutoff with A♠T♦. Best?

WhyWith ten big blinds behind, a standard raise burns a third of your stack and still leaves you guessing after the flop. Jamming A-T from the cutoff sets the terms yourself - real fold equity against the blinds, and enough equity to survive when a bigger ace looks you up. This short, there's no flop worth playing for.
What happensThe blinds release and you scoop the pot without a card falling. Note the win came from fold equity, not from hitting anything - that is the entire point of the jam.
A ten-big-blind stack has no maneuvering room. Late position, a hand like A-T is an open-jam: you claim the dead money now instead of raising into streets you're too short to navigate.

At ten big blinds there is no post-flop game left to play - late-position spots collapse to push-or-fold, and any raise you can't fold to a shove is just a worse jam.