AP Glossary
WhatIsMidpointMethod?
A calculation technique for MHB progressives that estimates the breakeven point by finding the statistical midpoint between the current meter value and the ceiling. Assumes uniform trigger distribution — in practice, some games may be biased toward triggering near the ceiling.
Why It Matters
Why this matters for advantage play
The midpoint method is a quick-and-dirty heuristic that gets you a usable answer in seconds during a floor walk. It's not precise enough for marginal calls, but for go/no-go triage on dozens of machines per hour, it's the right level of effort.
MHB Strategy GuideCross-Reference
Related terms
MHB (Must-Hit-By)
A progressive jackpot guaranteed to trigger before reaching a specified ceiling value. MHB progressives are the most mathematically analyzable form of advantage play because the ceiling creates a known upper bound for expected cost calculations.
Ceiling
The maximum value a must-hit-by progressive can reach before it is guaranteed to pay out. The closer a progressive gets to its ceiling, the higher the expected value of playing that machine.
Floor
The starting or reset value of a progressive meter — the lowest point it returns to after a jackpot hit. The distance between the floor and the current meter value indicates how much has been contributed by players since the last hit.
EV (Expected Value)
The mathematical average outcome of a bet calculated over infinite repetitions. Positive EV (+EV) means the play is profitable long-term; negative EV (-EV) means the house has the edge. AP players only take +EV plays.
Live Examples
Machines that use this
Documented Must-Hit-By machines on Run the Slots. Tap any title for the full advantage play guide.
Frequently Asked
Common questions about midpoint method
When the trigger distribution is biased. Some MHB games trigger disproportionately near the ceiling, which makes the simple midpoint a worse estimator than a more sophisticated calculation.
No. Use it for triage during a floor walk; use proper EV math (or our calculators) before committing to a session.
Incorporate the game's specific trigger-distribution shape, base game return, and meter rate. Our MHB calculator does this for documented games.
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