Session
Per-topic mastery
Every answer shows the formula and the exact book value, so you learn why the chart says what it says — not just the number. Numeric answers accept reasonable rounding; the chart’s precise figure is always shown. Stats persist in your browser.
Reference
The charts you’re drilling
Transcribed exactly from the source. These are the answer keys the drill grades against.
Foundations
Odds ratio ⇄ percentage
An odds ratio of A:1 means “A ways to lose for every 1 way to win.” To turn it into a winning percentage, put your 1 winning way over the total ways:
// 2:1 → 1/3 = 33% · 3:1 → 1/4 = 25% · 5:1 → 1/6 = 16.7%
Going the other way, from a percentage p back to odds: odds = (1 − p) / p : 1
Drawing hands
The Rule of 2 and 4
A fast estimate of your equity with a draw, no chart required:
two cards (all-in on flop) → equity ≈ outs × 4
- Flop, not all-in (you’ll see the turn only): × 2.
- Flop, all-in (turn and river): × 4.
- Turn (river only): × 2.
Calling
Pot odds & hero-call break-even
Villain bets B into a pot of P. You must call B to win what’s already there plus their bet (P + B). The price you’re getting:
break-even % = B / (P + 2B)
// ½-pot bet: call 0.5 to win 1.5 → 3:1 → 0.5/2 = 25%
If your equity is above the break-even %, calling is profitable. The Pot Odds and Hero Call Break-Even charts are the same numbers from these two angles.
Bluffing
Bluff break-even
You bet B into a pot of P, risking B to win P. The fold % you need to break even on the bluff alone:
// ½-pot bluff: 0.5 / 1.5 = 33% · pot-sized: 1/2 = 50%
Commitment
SPR — Stack-to-Pot Ratio
SPR = effective stack ÷ pot, measured on the flop. It tells you how strong a hand you need to commit your stack:
- Low (0–5): commit with over pair, top pair, bottom two pair.
- Medium (6–15): top two pair, sets, non-nutted flushes & straights.
- High (16+): sets and nutted hands only.