Tarsoj system – the physical wheel layout
The Tarsoj System is a structured roulette betting method based on sector coverage and progressive staking. It divides the roulette wheel into defined segments and cycles bets through those sectors in a fixed sequence, aiming to ensure that any given sector is always recently covered. Unlike pure flat betting, the Tarsoj method introduces a controlled progression that increases stakes after losses in a specific sector — while keeping overall exposure capped.
What Is the Tarsoj System?
The Tarsoj System is a wheel-sector-based roulette betting strategy. Rather than placing bets on the table layout sections (dozens, columns, colours), it places bets directly on groups of adjacent numbers on the wheel — targeting physical proximity on the rotor rather than table groupings. The system rotates through these sectors in a fixed order and escalates the bet size within a sector after a miss, before resetting on a hit.
The logic behind sector betting is that physical wheel segments represent geographic proximity — if a wheel has a bias (intentional or through wear), adjacent numbers will exhibit correlated hit rates. In a perfectly fair wheel, sector betting carries no mathematical advantage over any other bet configuration. The system’s value is structural discipline: it forces a systematic approach to coverage and prevents erratic bet placement.
Wheel Sector Division
The Tarsoj System divides the European wheel into four sectors of approximately equal size based on the physical wheel layout — not the table number sequence. Each sector covers roughly 9 numbers (with zero assigned to a specific sector):
| Sector | Wheel numbers (clockwise) | Count |
|---|---|---|
| Sector A | 0, 32, 15, 19, 4, 21, 2, 25, 17 | 9 numbers |
| Sector B | 34, 6, 27, 13, 36, 11, 30, 8, 23 | 9 numbers |
| Sector C | 10, 5, 24, 16, 33, 1, 20, 14, 31 | 9 numbers |
| Sector D | 9, 22, 18, 29, 7, 28, 12, 35, 3, 26 | 10 numbers |
Each sector bet is placed as a combination of straight-up bets — one chip on each number within the sector. Sector A and B require 9 chips each; Sector C requires 9 chips; Sector D requires 10. The uneven distribution (37 numbers ÷ 4 sectors) means Sector D carries one extra number.
How to Play the Tarsoj System
Staking Sequence
The Tarsoj staking progression per sector is capped — unlike Martingale, which doubles infinitely. The four-level cap prevents runaway losses:
| Miss count for sector | Units per number | Total stake (9-number sector) | Net profit if hit |
|---|---|---|---|
| 0 (first visit) | 1 | 9 units | +26 units |
| 1 miss | 2 | 18 units | +52 units |
| 2 misses | 3 | 27 units | +78 units |
| 3+ misses (cap) | 4 | 36 units | +104 units |
Net profit calculated as: (35 × units per number) − (stake − 1 unit returned) = 35u − 8u = 27u per chip at level 1. Approximate — exact figure depends on which specific number in the sector hits.
Mathematical Analysis
| Metric | Value | Notes |
|---|---|---|
| Numbers covered per sector | 9–10 | 24.3–27% of wheel |
| Win probability per sector bet | 24.3% | 9 ÷ 37 (sector A/B/C) |
| Base stake per spin (9-number sector) | 9 units | 1 unit per number |
| Return when a number hits (35:1) | 35 units | Plus original 1 unit = 36 returned |
| Net profit on level-1 hit | +27 units | 36 returned − 9 staked + 1 back = +27 |
| Net loss on level-1 miss | −9 units | Full sector stake lost |
| House edge | 2.70% | Identical to all EU roulette bets |
| Expected value per 9-unit stake | −0.243 units | 2.70% × 9 units |
Like all roulette systems, the Tarsoj does not alter the 2.70% house edge. What it provides is a structured bet framework — predictable stake sizes, defined coverage zones, and a capped progression. These make the system useful for players who want a systematic approach without the unlimited downside of Martingale-style doubling.
For a complete treatment of why no system overcomes the house edge, see the house edge guide.
Pros & Cons
- Structured approach — no ad hoc bet placement
- Capped at 4 levels — prevents Martingale-style catastrophic loss
- Sector hits pay 35:1 — strong returns on relatively few chips
- Works on any single-zero wheel — European or French
- Adaptable to biased wheel hunting if wheel data is available
- 9–10 chips per spin — requires higher bankroll than outside bet systems
- Slow to place at busy live tables without racetrack
- 2.70% house edge unchanged — no mathematical edge
- Win rate ~24% per spin — frequent losses are normal
- More complex than flat betting or outside-bet strategies
Tarsoj vs. Similar Systems
| System | Coverage | Stake | Win rate | Progression | Max loss risk |
|---|---|---|---|---|---|
| Tarsoj | 9–10 numbers | 9–36u | 24–27% | Capped 4 levels | Moderate |
| Kavouras Bet | 20 numbers | 8u flat | 54% | None | Low |
| Romanosky | 32 numbers | 8u flat | 86.5% | None | Low |
| Martingale | 18 numbers | 1u → ∞ | 48.65% | Unlimited double | Very High |
| Fibonacci | 18 numbers | Fibonacci seq. | 48.65% | Sequence | Medium |
Bankroll Requirements
| Unit size | Level 1 stake (9 chips) | Level 4 stake (36 chips) | Recommended session bankroll |
|---|---|---|---|
| €1 | €9 | €36 | €200 |
| €2 | €18 | €72 | €400 |
| €5 | €45 | €180 | €1,000 |
| €10 | €90 | €360 | €2,000 |