Quote:
Originally Posted by pdurrant
First, split the horses into five groups of five, call them A,B.C.D & E groups. Race each group. Call the fastest horse in each group A1, B1, C1, D1, E1; the second fastest horse A2, etc.
. . .
(The trick is to realise that after the second lot of races, we can already see who the fastest horse is.)
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Did not go through your logic in detail because there is a solution requiring fewer than eight races.