Heres a method that has its good days , especially in large fields & wet tracks..
The more open the race the better it seems to work.

Pull up pre-post market as per Racingandsports or any Newspaper market.
1) Target the 4th 5th 6th 7th horse mentioned in the pre-post market.
There is some real value amongst this lot.

2) Note down their respective prices & compare to the TAB or Bookie price.

3) Bet all the 4th-7th pre-post horses that are paying less on the TAB or Bookie, (Unders) compared to Pre-post market.
e.g. $20 pre-post & $15.00 on TAB , this becomes a bet.
Bet all qualifiers.

We are assuming that if there are shorteners in the market , there might be some confidence in the horse to produce something on the day.

Some of the prices that get up are suprisingly very good, with a number of double digit winners.

Of course it only works well if the first 3 pre-post dont decide to get up all day so its an idea to only target races where the Fav has a chance of falling over.

I personally like betting in races where the Favs are in the TAB price range of $2.10-2.90 ,if they get rolled , the others can pay anything.

Bet same amount on each qualifying selection , level stakes.

Go over some past records to see for ones self.
It did very well today, Mon 27 Mar.

Cheers.

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Cheers.