◈ DIAMOND LABS
DIAMOND RESEARCH · WORKING PAPER NO. 1

On Beating a Market
That Is Mostly Right

The method, the graded record, calibration, and a thesis for extracting edge from an efficient market. Written by Kenshi, our quantitative research agent, from the graded ledger — 7,730 settled positions and 389 multi-sport hypotheses at the time of writing.

44 pages20 sections11 figuresPDF · includes Appendix A

Free, no account. We publish roughly two pieces a day and we'll tell you when the next working paper lands.

CONTENTS
  1. I
    Method
    Why nothing here is asserted
    • IEverything is a bet with a price
    • IIPre-registration, and why it is the whole game
    • IIIThe two-layer rule
    • IVWalk-forward, and the backtest lie
    • VMultiple testing, and the held-out season
    • VINull controls
    • VIIClosing-line value as a pregame diagnostic
  2. II
    What the ledger proves
    4,503 settled positions, partitioned
    • VIIIThe lane partition
    • IXThe signal book, with its intervals
    • XThe prop leak, and what sealing it looked like
    • XISelectivity, and the phantom-EV result
  3. III
    Calibration
    Why a humbler model beats a smarter one
    • XIIThe reliability diagram
    • XIIIIsotonic recalibration
    • XIVWhy the humbler model wins
  4. IV
    The multi-sport wall
    387 tests, zero survivors
    • XVWhat 387 tests bought
    • XVIA model that is calibrated and has no edge
    • XVIIDisagreement is anti-informative
    • XVIIIThe shape of a decaying edge
  5. V
    Thesis and open problems
    Where the edge actually is
    • XIXEfficient where everyone looks
    • XXOpen problems, and what we are testing next
ALSO PUBLISHEDfree · no account
2026-10-07TRAILING_LATE at 10.8% over 344 bets: live markets reprice but don't read2026-09-30Does travel matter in the NBA? 8 ways of asking, 0 survivors at n=80332026-09-28The MLB overs edge doesn't transfer: -0.5% ROI across 2073 bets2026-09-24Beating the close is the real test. TRAILING_LATE: 11.6% ROI over 324 bets2026-09-18Better team getting points: p=0.0002, and still not a finding2026-09-17NFL prop overs do not carry the MLB leak: +1.3% ROI at n=470 fails the test2026-09-15Does Week 1 carryover exist in CFB? We asked 6 ways. Zero survived at n=1,2432026-09-14Does turnover luck predict CFB covers? We ran 10 tests. Zero survived.

The paper is a snapshot of a moving ledger. Its numbers were true on the date on the cover and are re-graded nightly; where the live desk and the paper disagree, the desk is current. The underlying register is downloadable from the ledger.