The Double Street Quad is a combination of four inside bets. It spreads six units over two double streets, a corner and a straight-up number. Covering more numbers changes how often the combined wager wins, but it does not turn roulette into a dependable income source.
How the six-unit combination is arranged
One example uses two units on the double street covering 4–9, two on the double street covering 16–21, one on the corner covering 26, 27, 29 and 30, and one straight up on 34. These groups do not overlap, so the combination covers 17 different pockets.
The total stake is six units on each spin. At a unit value of £1 that means £6 at risk, not £1. Changing the unit value scales every possible profit and loss by the same amount.
Correct returns and net profits
| Outcome | Total return, including winning stake | Net profit or loss on six units |
|---|---|---|
| Either double street wins | 12 units | +6 units |
| Corner wins | 9 units | +3 units |
| Straight-up number wins | 36 units | +30 units |
| Any uncovered pocket wins | 0 units | −6 units |
For a winning double street, the two-unit bet pays ten units profit and returns its two-unit stake. The other four units lose, leaving six units net profit. The corner returns nine on a one-unit bet, so the whole combination nets three. The straight-up returns 36, so the whole combination nets 30. These calculations include all the losing bets on the same spin.
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Coverage is not an advantage
On a fair single-zero wheel, the chance of a profitable result from this arrangement is 17/37, about 45.95%. The other 20 pockets lose the full six-unit stake. On a double-zero wheel the chance is 17/38, about 44.74%, with 21 losing pockets. Both zero pockets are uncovered in this example.
For single-zero roulette, expected profit per spin is (12 × 6 + 4 × 3 + 1 × 30 − 20 × 6) / 37 = −6/37 units, about −0.162 units. Dividing by the six-unit stake gives the usual 2.70% house edge. On a double-zero wheel, the expected loss is 12/38 units per spin, or 5.26% of the stake.
Changing the selection or stake
Selecting different non-overlapping groups with the same payouts leaves those probabilities unchanged. If groups overlap, the coverage and combined returns must be recalculated. A recent winning or losing number is not more likely to appear on the next independent spin.
Increasing stakes after losses increases the amount at risk; it does not repair the negative expectation. Set a session budget and time limit, and stop rather than betting more to complete a recovery.
The Fibonacci Betting System in Roulette
The Double Street Quad System
Components of the Roulette Wheel
Roulette Numbers and Ball Drop
Frets, Pocket Pads and Wheel Leveling
Further reading: Gambling Commission explanation of house edge.
