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Last Updated: August 4, 2014

# Spingo

## Introduction

Spingo is a wheel-based game found at Internet casinos using Microgaming software. It is said that the name is a combination of "spin" and "bingo."

## Rules

1. First, a ball is drawn from a pool of 21 balls from a hopper. This pool consists of two balls each numbered from 1 to 10, plus one ball numbered zero.
2. The ball then spins in a wheel with 25 slots colored as follows:
• Yellow: 8 slots.
• Red: 8 slots.
• Blue: 8 slots.
• Green: 1 slots.

3. The table below shows the bets available.

All wins are expressed on a "to one" basis, meaning the player keeps the original bet on a win. In the actual game, the odds are expressed on a "for one" basis, meaning original wager is not returned on a win. The "combination" bet is made on a specific combination of number (from 1 to 10) and any color except green.

### Spingo Pay Table

Game Pays (to one)
Red 2
Yellow 2
Blue 2
Green 23
Specific number (1 to 10) 9
Zero 19
Odd/Even 1
1 to 5 / 6 to 10 1
Combination of number and color 31

## Analysis

The following tables show my analysis of each bet. All wins are expressed on a "to one" basis. The probability column is the number of combinations divided by the total number of combinations of 525, which is the product of the 21 numbered balls and 25 slots on the wheel.

The following return table is for all even money bets, namely odd, even, 1 to 5, and 6 to 10. The lower right cell shows a house edge of 4.76%.

### Even Money Bets

Event Pays Combinations Probability Return
Win 1 250 0.476190 0.476190
Loss -1 275 0.523810 -0.523810
Total 525 1.000000 -0.047619

The following return table is for the red, blue, and yellow bets. The lower right cell shows a house edge of 4.00%.

### Red, Blue and Yellow Bets

Event Pays Combinations Probability Return
Win 2 168 0.320000 0.640000
Loss -1 357 0.680000 -0.680000
Total 525 1.000000 -0.040000

The following return table is for the green bet. The lower right cell shows a house edge of 4.00%.

### Green Bet

Event Pays Combinations Probability Return
Win 23 21 0.040000 0.920000
Loss -1 504 0.960000 -0.960000
Total 525 1.000000 -0.040000

The following return table is for the 1 to 10 bets. The lower right cell shows a house edge of 4.76%.

### 1 to 10 Bets

Event Pays Combinations Probability Return
Win 9 50 0.095238 0.857143
Loss -1 475 0.904762 -0.904762
Total 525 1.000000 -0.047619

The following return table is for the zero bet. The lower right cell shows a house edge of 4.76%.

### Zero Bet

Event Pays Combinations Probability Return
Win 19 25 0.047619 0.904762
Loss -1 500 0.952381 -0.952381
Total 525 1.000000 -0.047619

The following return table is for the combination bets. These bets are on a specific combination of a number (1 to 10) and a color (red, blue, or yellow). The lower right cell shows a house edge of 2.48%.

### Even Money Bets

Event Pays Combinations Probability Return
Win 31 16 0.030476 0.944762
Loss -1 509 0.969524 -0.969524
Total 525 1.000000 -0.024762

## Strategy

Based on the lowest edge of 2.48%, my advice is to make the combination bets only. You can always make most other bets with multiple combination bets and have a lower house edge. For example, rather than betting \$3 on the number 5, which would win \$27, bet \$1 on each of the red 5, yellow 5, and blue 5, for a net win of \$29 if any of them hit.

It is unusual that the bet with the greatest variance has the lowest house edge, but it is what it is.

Written by: Michael Shackleford

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