Brainteasers

[TruckOSaurus]

Killergran said:

What if you race all horses in 5 races first.
Then you race the winners in every race.
This way we can eliminate all except the number 2 and 3 from the race of the horse that one won the winners race, and nr 2 from the race of the horse that came second. Oh, and except the 3 winners of the winners race, ofc.

We now have 6 horses left. No?

That means we would have 5 horses left to test, since we already know which horse came first. How convenient. They all fit in one race! The nr 1 and 2 in that race are nr 2 and 3 globally.

You do it in 7 races!

Is this correct?

And we have a winner! That's exactly it.