ICM (Independent Chip Model) converts stacks into real prize-money equity: each player's chance of finishing 1st is their share of the chips, 2nd is computed among the rest, and so on — every finishing order, every payout. These drills run that exact calculation (the Malmuth-Harville model) live in your browser for each scenario and each branch: fold, call-and-win, call-and-lose.
Why ICM answers feel tight: chips you lose cost more real money than chips you win earn. On the bubble a 50/50 in chips is a clear losing call in dollars — the drills show you the exact percentage you needed versus what your hand had.
Honest simplifications: hand-vs-range equities are solid estimates, spots are modeled heads-up (no one else wakes up with aces), and blind decay is applied where it drives the decision (satellites). Real tables add noise — the drills train the core math those decisions hang on.