After thinking about win probabilities etc my head would just not be satisfied unless I had the answer while considering the scratched horses. So I wrote a simulation of the game to calculate the probabilities of an individual horse winning. These results are for 10,000 rounds of the game each so not enough for stability but good enough for an idea.
Based on the starting probabilities and the base number of holes to win, here are the win probabilities:
Horse | Win Requirement | Win % |
2 | 3 | 22% |
3 | 6 | 11% |
4 | 9 | 7% |
5 | 12 | 5% |
6 | 15 | 3% |
7 | 18 | 2% |
8 | 15 | 3% |
9 | 12 | 5% |
10 | 9 | 7% |
11 | 6 | 12% |
12 | 3 | 23% |
Now taking into account the Fineni board with the lower hole counts for horses 4-10:
Horse | Win Requirement | Win % |
2 | 3 | 20% |
3 | 6 | 9% |
4 | 8 | 10% |
5 | 11 | 6% |
6 | 14 | 4% |
7 | 17 | 2% |
8 | 14 | 4% |
9 | 11 | 6% |
10 | 8 | 10% |
11 | 6 | 10% |
12 | 3 | 21% |
So horses 2 and 12 are much more likely to win.
The simple change of adding a hole to horses 2 and 12 give you these results:
Horse | Win Requirement | Win % |
2 | 4 | 10% |
3 | 6 | 13% |
4 | 8 | 13% |
5 | 11 | 8% |
6 | 14 | 5% |
7 | 17 | 4% |
8 | 14 | 5% |
9 | 11 | 8% |
10 | 8 | 13% |
11 | 6 | 12% |
12 | 4 | 10% |
And finally a rough optimization to get a tighter spread of win probabilities:
Horse | Win Requirement | Win % |
2 | 4 | 8% |
3 | 6 | 10% |
4 | 8 | 11% |
5 | 10 | 9% |
6 | 12 | 8% |
7 | 13 | 10% |
8 | 12 | 8% |
9 | 10 | 9% |
10 | 8 | 10% |
11 | 6 | 10% |
12 | 4 | 8% |
However after having run this simulation, I realize that the win% I calculate is considering the final probability of a given horse winning from the start of the game before horses are scratched. So if you want to see a better spread of which horses win over multiple races, the above holes would be better but for a given race, if a middling horse number is not scratched, it'll have a higher chance of winning that race.
View attachment 891348
And if anyone's interested, here are the probabilities of a given horse being scratched in each of the scratch rounds (taking into account the likelihood of a horse being scratched in a previous scratch round).
Horse | Scratch 1 | Scratch 2 | Scratch 3 | Scratch 4 |
2 | 3% | 3% | 3% | 4% |
3 | 5% | 6% | 6% | 7% |
4 | 8% | 9% | 9% | 9% |
5 | 11% | 11% | 11% | 11% |
6 | 14% | 14% | 13% | 13% |
7 | 17% | 16% | 14% | 13% |
8 | 14% | 13% | 14% | 12% |
9 | 11% | 11% | 11% | 11% |
10 | 8% | 8% | 9% | 10% |
11 | 6% | 6% | 6% | 7% |
12 | 3% | 3% | 3% | 4% |