An AutoIt bot that plays roulette in the browser by controlling the mouse. (2015)
Someone asked me if it was possible to write a bot that would play roulette in the browser.
tl;dr I tried. I succeeded. It made €100 in 30 minutes. Eventually it lost money. Because it's still roulette...
The bot was designed for a game of roulette in the browser on a specific platform. It uses image search to recognize a win state. The way this works is as follows: The game displays a You won message whenever you won a round. I cropped this message once and saved it as a small image. At the right moment, after a spin, the bot would search for that image on screen. For this image search I used another AutoIt script called ImageSearch.au3 which in turn calls ImageSearchDLL.dll. These two files were not written by me.
I did not come up with the strategy myself. It was described to me and I implemented it as requested.
# PSEUDO CODE
win = False
color = black
maxDouble = 6
double = 0
maxTurn = 2
turn = 0
clicks = 1
while true:
double = 0 # reset bet to lowest
base_bet(clicks) # bet lowest
check_if_win() # set boolean
while not win and double != maxDouble:
if turn == maxTurn: # play twice per color
color = red if color == black else black # change color
clear_bet() # start fresh
clicks += pow(2, double) # determine nr of clicks required
double_bet(clicks) # bet double of previous amount
double += 1While working on the code I learned that this uses the Martingale strategy.
Everytime you lose, you double your previous bet. More on this later.
| No. of times doubled | No. of clicks | Bet amount |
|---|---|---|
0 |
1 |
1 × € 0.50 = € 0.50 |
1 |
1 + 2^0 = 2 |
2 × € 0.50 = € 1.00 |
2 |
2 + 2^1 = 4 |
4 × € 0.50 = € 2.00 |
3 |
4 + 2^2 = 8 |
8 × € 0.50 = € 4.00 |
4 |
8 + 2^3 = 16 |
16 × € 0.50 = € 8.00 |
5 |
16 + 2^4 = 32 |
32 × € 0.50 = €16.00 |
6 |
32 + 2^5 = 64 |
64 × € 0.50 = €32.00 |
As I format this table I realize that No. of clicks = 2^(No. of times doubled + 1).
This is a screenshot of the routlette table the bot was designed for:
If you look on the right, it clearly says €0.10 MIN and €50 MAX.
- The maximum bet in this particular game was €50.
- In the table above the bet becomes €32 after doubling 6 times.
Note: The 1st doubling is the 2nd bet. So, the 6th doubling is the 7th bet.
Therefore, it would make sense that I would limit the number of doublings to 6: no_of_doublings < 7.
Or I could limit the number of consecutive bets to 7: no_of_bets < 8.
At the time I probably mixed up the number of doublings with the number of consecutive bets and wrote the following lines (as can be seen in the source code):
Global $MAXDOUBLE = 8 ; max number of raises
...
While Not $win And $double <> $MAXDOUBLEThis allowed the bot to raise a 7th time which resulted in a bet of €50.
If a 7th raise was done, that means the bot lost 7 times in a row.
This amounts to a loss of 0.50 + 1.00 + 2.00 + 4.00 + 8.00 + 16.00 + 32.00 = €63.50.
If the bot was able to bet €64 and win, it would mean a profit of 128 - 64.00 - 63.50 = €0.50.
However the bot was only able to bet €50. Which meant that even a win would result in 100 - 50.00 - 63.50 = -€13.50.
This mistake guaranteed a loss of at least €13.50. Oops.
Though the odds of this happening are (19/37)^7 = 0.0094159282 = 0.94%.
The code should be:
Global $MAXDOUBLE = 6 ; max number of raises
...
While Not $win And $double <= $MAXDOUBLE