Heres another idea
If the combined odds of the 2 Favs is less than the 3rd fav ,we will assume its going to be a 2 horse war.

You will note that I said odds not prices ,so one must add up the 2 prices then deduct 2 so as to reflect the odds , now compare this to the odds of the 3rd fav by taking its price minus one.
If the odds of the 2 favs works out less than the 3rd fav ,it becomes a bettable race.
E.g. $3.00 ,3.90, 6.00 Favs in order. this would be a bettable race

What will also assume is that they are going to burn one another out when challenging one another.

Therefore there will be some real value to be had on the 3rd,4th,5th,6th favs.
Back them all when we see this situation.

Some of the divs can be incredable.

Take all the divs at 1 min till jump time & place ones bets accordingly.

Dutch Bet Staking plan
Would be to increase your bet by 50% each time , repeat the bet after a winner if still not in front.
Go for a max of 7 outs ,then start again.
We need to get 2 winning races in a row to clear the decks.

Cheers.

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Cheers.