How to bet the board
The board does two jobs: it finds the best price available on a selection, and it estimates how likely that selection is to win. Those are separate questions — the ring tells you where to bet, the win percentage tells you whether to bet.
- 1 · Ring — a ringed price is the highest price across the books you have selected, and it beats the average of the other books by at least 0.5%. Hover or focus the ring to see the book, the edge and the field average it was measured against. "Par" means every book is quoting the same price, so there is nothing to shop.
- 2 · Win % — the chip beside a player is the vig-free implied chance, averaged across the books. It strips the bookmaker margin, so it is a fair estimate rather than a raw price. Convert it to a break-even price with
100 ÷ win%: 45% needs 2.22, 60% needs 1.67. - 3 · Compare — bet only when the ringed price is longer than your break-even price. If the win chip says 52% (break-even 1.92) and the best price is 2.05, that is a genuine overlay. If the best price is 1.85, the market is asking you to pay a premium.
- 4 · Spread — games spreads pay better than short win prices. Once a favourite drops below about 1.30, move to the handicap and shop the same line across books.
- 5 · Chart — open a match chart before staking. A price drifting one way at every book is information; a single book lagging the others is usually the edge you are seeing, and it may vanish.
What is the vig?
The vig (short for "vigorish" — also called the margin, juice, or overround) is the bookmaker's built-in cut. It is baked into every price they quote, and it is the reason the books win over the long run regardless of who wins the match.
In a perfectly fair two-sided market, the implied probabilities of both players would add up to exactly 100%. They never do. If a book prices Player A at 1.90 and Player B at 1.90, each price implies a 52.6% chance ((100 ÷ 1.90)) — that is 105.2% in total. The extra 5.2% is the vig: it is the edge the book takes on every bet in that market, win or lose.
Deuce Desk shows a live vig badge on every match on the board. It is the average bookmaker margin across the books you have selected — the sum of the implied probabilities minus 100%, so a badge reading 5.4% means you are effectively paying a 5.4% tax on every bet at those prices. Hover or focus the badge to see each book's individual margin and the tightest (cheapest) book on that match.
- · Lower vig is always better for you. A 2% margin at BetMGM leaves more of the true price than a 7% margin at a shop pricing the same match — this is exactly why the best-value ring often lands on the lowest-margin book.
- · Vig widens on live markets. Margins creep up in-play because the book carries more risk while the ball is in play, so a live price has to clear a bigger hurdle to be genuine value.
- · Vig is why the Win % is "vig-free". A raw 1.90 price implies 52.6%, but once the margin is stripped the fair estimate is closer to 50%. The win chip shows that stripped number — comparing it to the price you can actually get is the whole test of value.
Worked examples per bookmaker
| Book | Market | Ringed price | Benchmark | Edge | How to play it |
|---|---|---|---|---|---|
| Sky Bet | Moneyline | 8/13 (1.62) | 1.57 average across the other books | +3.2% | A £50 stake returns £81 instead of £78.50 — same bet, £2.50 more back. Take the ringed price. |
| Paddy Power | Moneyline | 6/5 (2.20) | 2.10 field average · 45% vig-free win chance | +4.8% | 45% win chance needs 2.22 to break even, so 2.20 is close to fair. The ring says it's the best of the shops, not that it's profitable — pass unless you rate the player above 45%. |
| bet365 | Games spread | -3.5 at 10/11 (1.91) | 1.84 field average | +3.8% | Use spreads when the win market is short (favourite under 1.30). Getting the same -3.5 line at 1.91 instead of 1.84 is free value on a bet you were making anyway. |
| Ladbrokes / Coral | Moneyline | 5/6 (1.83) | 1.83 — par | par | 'Par' means every selected book is identical. There is no shopping gain here; bet on your own read of the match, or check the chart for a book about to move. |
| BetMGM (US) | Moneyline | 2.35 (+135) | 2.18 field average · 41% win chance | +7.8% | The biggest edges usually sit on the underdog side of a US book after a live break of serve. 41% needs 2.44, so 2.35 is still slightly short of fair — half stake at most. |
| Betfred | Moneyline (in-play) | 11/8 (2.38) | 2.20 field average | +8.2% | A double-digit in-play edge normally means Betfred is slow to react to a score change. Check Live Lines: if the price already reflects the break, take it; if the score just moved, expect the price to be pulled. |
Prices above are illustrative shapes, not live quotes — the numbers on the board are the live ones.
Bankroll calculator
Enter your bankroll, the price you can actually get, the board's vig-free win % and the live vig badge. The calculator sizes the bet with quarter-Kelly, shades it down for the bookmaker margin, and never exceeds your own per-bet cap.
- · Raw Kelly 8.36% → vig-shaded 6.69% → quarter-Kelly staked.
- · Returns £17.56 if it lands (£9.20 profit). A flat cap bet would be £10.00.
Betting journal
Log every bet you place — stake, price taken, outcome — and the journal keeps your running profit, ROI and strike rate. Entries are stored in this browser only.
| Date | Match | Selection | Book | Stake | Price | Outcome | P/L | |
|---|---|---|---|---|---|---|---|---|
| No bets logged yet. Add your first bet above and your profit, ROI and results will update here. | ||||||||
Staking & discipline
- · Flat stake 1–2% of your bankroll per bet; edges of 3–5% do not justify bigger bets.
- · Never chase a price that has already moved against you — the chart shows the drift.
- · In-play edges above 8% usually mean one book is slow, not that you found value.
- · Track the price you actually took; closing-line comparison is the only honest scorecard.
- · 18+. Betting involves risk — only stake what you can afford to lose.