Six line or six numbers system
The Six Line bet — also called the Double Street — is an inside bet covering six consecutive numbers across two adjacent rows on the roulette table. It pays 5:1 and covers 16.2% of the wheel per chip placed. Used as a standalone system, multiple Six Lines can cover large portions of the table with efficient chip usage and a uniform profit structure.
What Is a Six Line Bet?
A Six Line bet (also written as “sixline” or called a “double street”) is placed on the intersection of two rows on the roulette table layout. Each row contains three numbers, so two adjacent rows give you six consecutive numbers per bet.
For example: placing a chip on the line between rows 1–3 and 4–6 covers the numbers 1, 2, 3, 4, 5 and 6 simultaneously. The payout is 5:1, meaning a 1-unit bet returns 6 units (5 profit + original stake) if any of the six numbers hit.
The Six Line is one of the most versatile inside bets in roulette because it covers a meaningful number of positions (6) while still paying well enough (5:1) to generate profit. Unlike dozens or columns (which pay only 2:1), a single Six Line hit recovers five losing chip positions.
Table Layout & Placement
The 36 non-zero numbers on a roulette table are arranged in 12 rows of 3 numbers each. This gives exactly 11 possible Six Line positions (between rows 1–6, rows 4–9, rows 7–12, and so on). Each Six Line covers one pair of adjacent rows:
| Six Line # | Numbers covered | Rows |
|---|---|---|
| SL 1 | 1, 2, 3, 4, 5, 6 | Row 1–2 |
| SL 2 | 4, 5, 6, 7, 8, 9 | Row 2–3 |
| SL 3 | 7, 8, 9, 10, 11, 12 | Row 3–4 |
| SL 4 | 10, 11, 12, 13, 14, 15 | Row 4–5 |
| SL 5 | 13, 14, 15, 16, 17, 18 | Row 5–6 |
| SL 6 | 16, 17, 18, 19, 20, 21 | Row 6–7 |
| SL 7 | 19, 20, 21, 22, 23, 24 | Row 7–8 |
| SL 8 | 22, 23, 24, 25, 26, 27 | Row 8–9 |
| SL 9 | 25, 26, 27, 28, 29, 30 | Row 9–10 |
| SL 10 | 28, 29, 30, 31, 32, 33 | Row 10–11 |
| SL 11 | 31, 32, 33, 34, 35, 36 | Row 11–12 |
Place your chip on the outer edge of the table at the boundary line between two rows — exactly where a street bet would be placed, but extended to touch the line between rows.
The Mathematics
| Metric | Single Six Line | Notes |
|---|---|---|
| Numbers covered | 6 / 37 | European wheel |
| Win probability | 16.22% | 6 ÷ 37 |
| Loss probability | 83.78% | 31 ÷ 37 |
| Payout | 5:1 | Returns 6 units total |
| Net profit per win | +5 units | 6 returned − 1 staked |
| Net loss per loss | −1 unit | Single chip lost |
| House edge | 2.70% | Same as all EU bets |
The Six Line’s key characteristic is its asymmetric payoff ratio: you win infrequently (+5 units, 16.22% of the time) but lose only 1 unit per losing spin. This makes it ideal as a building block for multi-bet systems — the rare big win from one line offsets losses on other positions.
The Six Line System: How to Build It
The “Six Line System” refers to placing multiple Six Lines simultaneously to cover a large portion of the wheel. The standard configuration uses 5 Six Lines covering 30 numbers with 5 units staked:
| Configuration | Six Lines placed | Numbers covered | Units staked | Coverage % | Net profit if hit |
|---|---|---|---|---|---|
| 3 Six Lines | 3 non-overlapping | 18 | 3 | 48.6% | +3 units |
| 4 Six Lines | 4 non-overlapping | 24 | 4 | 64.9% | +2 units |
| 5 Six Lines | 5 non-overlapping | 30 | 5 | 81.1% | +1 unit |
| 5 Lines + corner | 5 lines + 1 corner | 34 | 6 | 91.9% | +0 to +3 |
System Variations
Classic 5-Line Flat
Five non-overlapping Six Lines, 1 unit each, 30 numbers covered. Fixed stake every spin, +1 unit net on any hit. Simple and predictable. See the table above for exact number coverage.
4 Lines + Outside Bet
Four Six Lines covering 24 numbers (64.9% coverage) plus 1 unit on a column or dozen covering part of the uncovered range. Increases coverage while maintaining a moderate profit per hit.
Progressive Six Line
After a losing spin, increase the next stake by 1 unit per line. This is a mild progression that attempts to recover losses faster. Increases bankroll risk — not recommended for beginners.
Kavouras Integration
The Kavouras Bet uses a Six Line as one of its components (the 31–36 six-line at 2 units). Understanding Six Lines helps you understand why Kavouras is structured the way it is.
Step-by-Step: How to Play the Six Line System
Pros & Cons
- Flexible coverage — choose 3, 4 or 5 lines based on your risk preference
- 5:1 payout means one hit covers five lost positions from previous spins
- Consistent chip placement — same lines every spin, easy to execute at speed
- Works well alongside outside bets for gap coverage
- Scales cleanly to any bankroll size with 1-unit steps
- Zero always loses all staked lines — house edge applies in full
- 5-unit stake per spin with only +1 unit net profit — very slow bankroll growth
- Placing 5 chips every spin can be slow at busy live tables
- No mathematical advantage over simpler outside bets
- Uncovered block of 7 numbers produces full 5-unit loss when hit
Six Line vs. Other Coverage Systems
| System | Coverage | Stake | Win rate | Net profit/hit | Complexity |
|---|---|---|---|---|---|
| 5× Six Lines | 30/37 (81%) | 5u | 81.1% | +1u | Low |
| Romanosky | 32/37 (86%) | 8u | 86.5% | +1u | Medium |
| 64% Two Dozens | 24/37 (65%) | 2u | 64.9% | +1u | Very low |
| Kavouras Bet | 20/37 (54%) | 8u | 54.1% | +1 to +10u | Medium |
| Flat Even-Money | 18/37 (49%) | 1u | 48.6% | +1u | Very low |
Bankroll Management
| Session bankroll | Unit | 5-Line stake | Stop-loss | Profit target |
|---|---|---|---|---|
| €100 | €1 | €5 | −€30 | +€15 |
| €200 | €2 | €10 | −€60 | +€30 |
| €500 | €5 | €25 | −€150 | +€75 |