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icmPairwiseBubbleFactor

Pairwise bubble factor (finite differences on icmExpectedPayouts).

icmPairwiseBubbleFactor(stacks: number[], payouts: number[], heroIndex: number, villainIndex: number, potChips: number): number

Import​

const poker = require('poker-calculations');

ESM (Node):

import { createRequire } from 'module';
const require = createRequire(import.meta.url);
const poker = require('poker-calculations');

When to use​

Compare ICM cost of losing vs gain from winning a pot against one opponent—classic bubble-factor analysis for tournament all-ins. Uses finite differences on icmExpectedPayouts when stacks shift by potChips.

How to use​

const stacks = [9000, 8500, 3000];
const payouts = [6000, 3600, 2400];
const hero = 0;
const villain = 2;
const pot = 3000;

const bf = poker.icmPairwiseBubbleFactor(
  stacks,
  payouts,
  hero,
  villain,
  pot
);
console.log('bubble factor vs seat 2:', bf); // loss/gain ratio > 1 means ICM pressure

const evBefore = poker.icmExpectedPayouts(stacks, payouts);
console.log('hero ICM EV:', evBefore[hero]);

See also​

icmExpectedPayouts · multiwaySymmetricBreakevenCallEquity