A Responsible Player Prop Research Checklist

This library opened with a claim: the line is a question, and research is deciding whether the question deserves your disagreement. Nineteen articles later, the theory is on the record. This piece compresses it into something you can actually run before a slate, in order, in about twenty minutes.

Each step below exists because skipping it has a specific, predictable failure mode. The checklist is deliberately front loaded with reasons to skip a prop. Passing on a bad research spot costs nothing. Forcing one costs money and, worse, corrupts your record so you cannot learn from it.

Step one: verify the offer you can actually buy

Confirm four things before any analysis: the exact stat definition, the exact line, the platform, and which sides are genuinely for sale. Stat definitions differ across platforms in ways that settle differently. A fantasy points prop is a different product on every app that sells one. And as covered in the platform comparison, some offers are only sold one way, so an under you have talked yourself into may not even exist.

• Stat: what exactly counts, and what settles it.
• Line: the number in front of you now, not the one from this morning.
• Platform: whose rules and whose payout structure govern this offer.
• Sides: whether the direction you like is actually sold at standard terms.

Step two: establish opportunity or walk away

Opportunity decides most props before skill enters the conversation. Minutes, plate appearances, snaps, starts, scheduled rounds, series length. Every sport in this library has its own version of the same rule, from minutes in soccer to map counts in esports to scheduled rounds in a UFC fight.

The responsible move when opportunity is unknown is to skip. Unconfirmed lineups, questionable tags, rotation changes after a trade, a starter on a pitch count. No rate analysis survives a missing denominator. Skipping these spots is not caution for its own sake; it is refusing to bet on a coin whose faces you have not seen.

Step three: form your estimate before reading the market

Write a number down before you look at consensus, projections, or anyone's opinion, even a crude one. The order matters because anchoring is not a weakness of careless people; it is a property of attention. Once you have seen the line, every stat you pull afterward quietly organizes itself around it. An estimate formed first, as described in the projections article, gives the line something honest to disagree with.

Your estimate does not need to be a simulation. A baseline from recent opportunity, adjusted for the opponent and venue, honestly uncertain, beats a precise number you copied from someone whose incentives you do not know.

Step four: find the boring explanation for any gap

When your estimate disagrees with the line, the correct first hypothesis is that you are missing something. News you have not seen, a role change, a platform rule, a stale number about to move. The line movement article covers what the market's own motion can tell you; the model, line, and market piece covers why a sharp reference, where one exists, is the strongest sanity check available.

Only after the boring explanations fail does a gap become interesting. And even then, size your confidence by sample and calibration, not by the size of the gap. The largest gaps are more often errors than edges.

Step five: size the uncertainty honestly

Convert your view into a probability and say it out loud. Most defensible edges in this space live between 52 and 58 percent, which means losing often while being right. If your probability sounds like 65 percent or more on a standard line, revisit step four: either you have found something the market genuinely missed, which is rare, or your estimate is broken, which is common. The probability article is the long version of this step.

Step six: log the decision, then judge the process

Record the line, your probability, one sentence of reasoning, and later the result. Grade yourself the way the backtesting article grades a model: on calibration over volume, never on any single night. This is the same standard we hold our own engines to in the Model Room, where every Slateline projection is graded in public.

The frame that holds it all

A checklist governs process. It cannot govern why you are at the table. So the last items are not analytical. Decide what this activity is for, decide what it may cost, and decide both before the slate starts.

• Set a budget before researching, and treat it as spent entertainment money, not a bankroll to grow.
• Never chase. A losing day does not change tomorrow's probabilities.
• Skip days freely. There is no schedule you owe anyone.
• Judge decisions by the information you had, not by how they settled.
• If it stops being fun, stop completely. Help exists at 1 800 GAMBLER and through the National Council on Problem Gambling.

That is the whole system. Verify the offer. Establish opportunity. Estimate first. Hunt the boring explanation. Size the uncertainty. Log everything. Protect the reason you started. None of it guarantees an outcome, because nothing does. What it guarantees is that you will know, honestly and in writing, whether your process deserves your continued trust.