The KBO King is a research tool for KBO player props. We project a realistic number for every player on the slate, compare it to the posted line, and surface the spots where the two disagree the most. Here's the whole approach, in plain English.
For each player and each stat, we estimate what we actually expect to happen tonight — not a guess, but a number grounded in recent form, the matchup, the role, and the conditions of the game. That projection is the foundation for everything else.
Every prop comes with a line. We show our projection and the model's win probability beside it and leave the comparison to you. We used to publish the gap as an edge and sort it into Elite / Strong / Lean / Pass tiers; we no longer do.
We graded them. Over 2,044 picks across 41 slates the board hit 50.5% (965-945), against the ~54% break-even of the -119 leg the grader prices and the 57.74% a two-pick entry has to clear. The three tiers we actually surfaced — Elite 53.8%, Strong 52.8%, Lean 52.9% — are all below that break-even and all three are negative on units. Taken together they are 53.2% (413-364) with a slate-clustered 95% interval of [48.7%, 57.8%], which contains “no edge” comfortably. A tier that cannot be shown to work is not a conviction, so we stopped printing one.
Worth knowing how the ledger is built: the nightly grader re-derives every result from the full snapshot history, but it only ever writes out the most recent 500 graded rows internally and the most recent 300 to the public track record. The row-by-row ledger you can inspect is a rolling window — it does not accumulate no matter how many seasons we run — so we are not going to arrive at some larger sample that rescues a tier later. What you can check is what there is.
Most plays are submitted as multi-pick slips, so a single legs page isn't enough. We assemble the day's combinations — balancing the chance of hitting against the payout on offer, and how the picks relate to one another. We no longer publish an EV number or a recommended stake for them.
Once games finish, every pick we posted is graded — win, loss, or push — and added to our track record. You can see our hit rate over time. Nothing gets quietly deleted after the fact.
See our model accuracy → — the reliability curve and Brier score proving our published probabilities match real-world frequencies. Calibration, not a betting record.
No — and we do not claim to beat the price. Player props are inherently uncertain, our projections are often wrong, and the graded record on this site does not clear the pick’em break-even. Treat everything here as research, which is exactly why we publish the whole track record.
The board refreshes through the day as lines and information move, so the projections you see reflect the latest available picture before first pitch.
Power slips pay more but every leg must hit. Flex slips pay less per win but still return something if one leg misses. We build and size both so you can choose the risk profile you're comfortable with.
We do not recommend a stake. Only ever risk money you can afford to lose. This is an information tool, not financial advice.
The KBO King is for entertainment and informational purposes only. 21+. If gambling is no longer fun, it's time to stop — please play responsibly.