Grand Slam a good bet

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Originally Posted by boldruler

You need to pick the winner of the last leg.

For the first three legs the horse you pick must finish first, second, or third. Today the 7th race was tough unless you liked San Telmo but when a short priced horse win the last race, $58 is a gift.

Bold:

When you play this bet, in general, is it better to play more horses in the first three legs in hopes of cashing multiple times, or it is best to spend more on the last??? I know it's tough to answer that question in a vacuum, but I was wondering if you had any thoughts.