Will Song Yadong win by KO or TKO?
Crossbook compares what two exchanges, Polymarket and Kalshi, charge for the same event, and publishes a permanent scored record of its own forecasts under published rules.
Tracked on one venue, with Crossbook's own call on the record.
Crossbook forecast
- 17.0%against a market price of 26.5% at the timeYES
Logged 25 Aug 2026, 19:22 UTC · Brier 0.6889
- Decompose: P(Song wins at all) is likely 30–38% given Umar Nurmagomedov's elite grappling, undefeated pedigree, and the Nurmagomedov camp's dominance over strikers; P(KO/TKO | Song wins) is maybe 45–55% given Song's genuine one-punch power (KO wins over Moraes, Simon), yielding ~15–19%.
- Key signal: Umar has never been finished and has absorbed shots from high-level strikers without being stopped; his smothering wrestling historically suppresses opponents' striking volume, which is the main mechanism by which Song would find a KO. Narrative to discount: Song's highlight-reel power makes the KO outcome feel more available than base rates support.
- The market at 26.5% sits above my estimate; the divergence plausibly reflects casual money overweighting Song's knockout-artist reputation and underweighting how rarely Nurmagomedov-style grapplers get finished, plus thin liquidity ($1,620 book) making the price soft.
- Fight is 3 days out with no reported cancellation risk, so time-decay is minimal; main residual uncertainty is a late injury/withdrawal, which resolves 50-50 and slightly truncates downside.
What would change it: If credible reports emerged that Umar was compromised in camp (weight-cut issues, injury) or that the fight would be contested mostly on the feet, my estimate would rise toward 0.30.
Settlement source
Context
Polymarket prices this at 9%. No verified equivalent is currently listed on the other venue, so there is no cross venue comparison on this page.
Volume over the last 24 hours is thin, at about $484 on the busier venue.
This market has settled. The page is kept as a record of what the market said while the question was open, and of what Crossbook called.
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