You Will Run Worse Than You Ever Thought Possible

An old forum-era warning, passed between players for decades because it keeps coming true: you will eventually run worse than you ever thought possible. The mechanism is not bad luck finding you. It is arithmetic. A downswing is not a scheduled annual event whose odds you can eyeball; every hand you play begins a fresh sample in which an extended bad run can start, and across a playing career you begin millions of them. Improbable-per-sample plus enormous sample count equals inevitable. Winners included, and with no memo announcing that this one is variance rather than your game falling apart.

Intuition undershoots this badly, which is why the honest move is to stop intuiting and look. Put a real win rate and standard deviation into the variance calculator and read off what a plausible bad stretch looks like in length and depth. Nearly everyone finds the output worse than they would have guessed, and the guess is what most people are bankrolled against. The downswing reference collects what those simulations say across stakes and win rates.

Being under-rolled then costs you twice. The direct cost is risk of ruin. The compounding cost is that short money plays scared: skipped thin value, abandoned bluffs, passed spots, and that degradation loses more than the variance alone ever would. A proper bankroll is a decision-quality tool before it is a survival tool. Five buy-ins down with ninety-five behind reads as one long session that went badly; five down with five behind reads as a crisis, and people play like the thing they are experiencing.

One multiplier hides in plain sight: win rate relative to standard deviation is the whole game. Cut your win rate in half while your standard deviation stays put, which is exactly what adding tables does past your comfortable limit, and downswings become far more frequent and far deeper at identical total EV. Table count, seat selection, and game selection are variance decisions, not just volume decisions, and dropping a table is sometimes the highest-EV move available. Run your own numbers both ways in the calculator before your next stakes or volume decision; the difference between the two curves is usually the argument that settles it.