If the old system/selection method of backing a last start winner if it starts again inside 7 days is profitable, the opposite may well be true too.

ie: Lay a last start winner if it has not started within, say, 28 days.

The reasoning being that if a horse is going well then the connections would start it sooner than 28 days from a win.
If it has not started for >=28 days it may have had a setback of some sort which would also make it a risk.

Can one of the database gurus run it through for me please.
Also maybe 14 days, 21 days etc.
A thousand thankyou's in advance, jose.

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Jose'.