18 Roulette
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Introduction
Roulette-18 is similar to roulette, except has 19 different outcomes. It can be played with either a custom roulette wheel or 20-sided icosahedron. You can find it at some of the Grosvenor casinos in the UK.
Rules
The game uses an icosahedron, which for the non-math nerds is one of the five platonic solids, in this case the one with 20 triangles. The die is numbered 0 to 18, plus a 00. If the 00 is rolled, then all bets have no action and the die is rolled again. The following bets are available on the outcome of the roll.
- Straight up: Bet on an individual number. Pays 17 to 1.
- Split: Bet on two adjacent numbers of the betting payout. Pays 8 to 1.
- Street: Bet on a row of three numbers of the betting payout. Pays 5 to 1.
- Corner: Bet on four adjacent numbers of the betting payout. Pays 7 to 2.
- Line: Bet on six adjacent numbers of the betting payout. Pays 2 to 1.
- Odd: Bet on all the odd numbers. Pays 1 to 1.
- Even: Bet on all the even numbers. Pays 1 to 1.
- 1-9: Bet on the number 1 to 9. Pays 1 to 1.
- 10-18: Bet on the number 10 to 18. Pays 1 to 1.
- Red: Bet on the nine red numbers. Pays 1 to 1.
- Black: Bet on the nine black numbers. Pays 1 to 1.
Analysis
The following tables show the analysis of each bet. The double-zero is ignored because all bets continue to have action after a double-zero is rolled.
Straight Up
Event | Pays | Numbers | Probability | Return |
---|---|---|---|---|
Win | 17 | 1 | 0.052632 | 0.894737 |
Loss | -1 | 18 | 0.947368 | -0.947368 |
Total | 19 | 1.000000 | -0.052632 |
Split
Event | Pays | Numbers | Probability | Return |
---|---|---|---|---|
Win | 8 | 2 | 0.105263 | 0.842105 |
Loss | -1 | 17 | 0.894737 | -0.894737 |
Total | 19 | 1.000000 | -0.052632 |
Street
Event | Pays | Numbers | Probability | Return |
---|---|---|---|---|
Win | 5 | 3 | 0.157895 | 0.789474 |
Loss | -1 | 16 | 0.842105 | -0.842105 |
Total | 19 | 1.000000 | -0.052632 |
Corner
Event | Pays | Numbers | Probability | Return |
---|---|---|---|---|
Win | 3.5 | 4 | 0.210526 | 0.736842 |
Loss | -1 | 15 | 0.789474 | -0.789474 |
Total | 19 | 1.000000 | -0.052632 |
Line
Event | Pays | Numbers | Probability | Return |
---|---|---|---|---|
Win | 2 | 6 | 0.315789 | 0.631579 |
Loss | -1 | 13 | 0.684211 | -0.684211 |
Total | 19 | 1.000000 | -0.052632 |
All Even Money Bets
Event | Pays | Numbers | Probability | Return |
---|---|---|---|---|
Win | 1 | 9 | 0.473684 | 0.473684 |
Zero | -0.5 | 1 | 0.052632 | -0.026316 |
Loss | -1 | 9 | 0.473684 | -0.473684 |
Total | 19 | 1.000000 | -0.026316 |
Strategy
All even money bets have a rule that if the die lands on zero then the player loses half only. This cuts the house edge in half from 5.26% to 2.63%. Thus, much like in European roulette, my advice is to stick to the even money bets only.
Rule Card
Here is a scan of the rule card.
Actual Roulette-18 dice, kindly given to me at the Global Gaming Expo.