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Notes on value, discipline and the truth about tipsters.

No tips here — just how the market actually works, and why honesty is the only edge worth selling.

03 Aug 2026

Bookmaker margins this week: Betfair Exchange cheapest at -0.04%, SBO costliest at 14.35%

Our weekly, data-measured ranking of bookmaker margins: 1,487 matches priced in the last 30 days. The gap between the cheapest and costliest book is -392× — the biggest controllable cost in betting, measured, not claimed.

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27 Jul 2026

Bookmaker margins this week: Betfair Exchange cheapest at -0.08%, SBO costliest at 14.07%

Our weekly, data-measured ranking of bookmaker margins: 1,046 matches priced in the last 30 days. The gap between the cheapest and costliest book is -172.9× — the biggest controllable cost in betting, measured, not claimed.

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23 Jul 2026

We tried 17 accumulator strategies on our own data. 14 "won". All 17 were losing bets.

Daily tickets at 1 to 6 legs, three selection methods, real Betfair odds, a luck audit on every result. The most complete accumulator study we know of — and the most damning.

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23 Jul 2026

How much should you actually bet? Kelly staking, tested on 152 real value bets

Quarter-Kelly, half-Kelly, flat 1-3% — we ran them all on our real settled value bets, then stress-tested every scheme in 5,000 alternative universes. The answer is smaller than you want it to be.

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20 Jul 2026

Bookmaker margins this week: Matchbook cheapest at 1.76%, SBO costliest at 14.00%

Our weekly, data-measured ranking of bookmaker margins: 724 matches priced in the last 30 days. The gap between the cheapest and costliest book is 7.9× — the biggest controllable cost in betting, measured, not claimed.

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17 Jul 2026

Strategy graveyard #2: we could predict line moves — and still lost money

Our model genuinely predicted which way odds would move, in 4 of 4 out-of-sample seasons. Following that signal earned +5.2% CLV at the best price — and lost 2.4% in cash. Meet the winner's curse.

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16 Jul 2026

The best betting strategy we ever tested still lost: back every draw

We simulated 1,329 real-odds bets across 8 leagues. Every strategy lost — but "always bet the draw" lost least, beating our own models and the blind favourite. Here is the autopsy, and why the draw is the market's most interesting corner.

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13 Jul 2026

Bookmaker margins this week: Matchbook cheapest at 1.68%, SBO costliest at 14.13%

Our weekly, data-measured ranking of bookmaker margins: 573 matches priced in the last 30 days. The gap between the cheapest and costliest book is 8.4× — the biggest controllable cost in betting, measured, not claimed.

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07 Jul 2026

Bookmaker margins this week: Matchbook cheapest at 1.50%, SBO costliest at 14.16%

Our weekly, data-measured ranking of bookmaker margins: 589 matches priced in the last 30 days. The gap between the cheapest and costliest book is 9.4× — the biggest controllable cost in betting, measured, not claimed.

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06 Jul 2026

We built ~50 betting models. Every single one lost.

Elo, XGBoost, Dixon-Coles, xG — we spent months building football prediction models and testing them like scientists, not marketers. Here is the full autopsy, including the two bugs that briefly "made" +96% ROI.

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06 Jul 2026

Accumulator math: what a parlay really costs you

Every leg of an accumulator multiplies the bookmaker's margin. By leg five you are paying more house edge than a roulette wheel. Here is the arithmetic bookmakers hope you never do.

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02 Jul 2026

Why a 67% win rate can still lose you money

We audited a tipster who genuinely won 67% of his picks — and still lost money. The maths that decides profit has two numbers, and win rate is the less important one.

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02 Jul 2026

How to verify any tipster in 10 minutes: a practical checklist

Before you pay for picks, run this seven-step checklist: full history, the two-number test, sample size, real odds, timestamps and CLV. Ten minutes filters out almost everyone.

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26 Jun 2026

Why a Tipster's ROI Lies — We Analysed 20 of the 'Best'

A '+93% ROI' tipster sounds unbeatable — until you see it's a 20% strike rate on odds of 26 over three months. We break down the top 20 and the one number that actually measures skill.

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14 Jun 2026

We audited a popular AI tipster using their own public data. 25,890 matches. It loses money.

One well-known tipping service publishes its entire prediction history — every pick, win or lose. So we downloaded it and ran the numbers. The verdict, from their own data: the 'AI' mostly just copies the bookmaker's favourite, the headline accuracy is an illusion, and backing every pick would have lost 5.6%.

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10 Jun 2026

The favourite's price dropped — and it won more often. What 15,727 matches say about the closing line

We compared Pinnacle's opening and closing prices on 15,727 matches across eight European leagues and six seasons. When the favourite's price shortened before kick-off, it won 55.4% of the time. When it drifted, 50.0%. That gap is the whole argument for Closing Line Value — and also the reason you can't simply bet on it.

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27 May 2026

Why most tipsters hide their losses

A betting record that only shows winners is not a record — it is marketing. Here is the simple maths of survivorship that makes most tipster results meaningless.

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20 May 2026

What is Closing Line Value (and why it's the only number that matters)

Win rate feels like the measure of a good bettor. It is not. The number that actually predicts a long-term edge is whether you beat the closing line.

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