crash,

Sorry about that ... I must have misunderstood (which is surprisingly easy on forum posts).

If this helps....

Let's assume that all horses are similar class horses for a moment and are running over 1600m with performance at that distance (win or placing).
Those issues have to be left aside to give you any advice. (Also I'm assuming it's a good track.

The #4 and #7 are most likely to win, but will be very poor value.

The #2 is risky given it's last first up dismal failure.

The #1 and #6 are improvers so would be worth a look at odds.

The #5 is consistent and should be better odds given the two other last start winners.

Given the "all things being equal scenario" I'd be backing all three horses at value (1,5,6) and leaving the poorer value alone.

Unfortunately, it's never an "all things being equal" scenario also I do not know the odds offered, so can only give a historical trend impression.

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