I was thinking of starting a new thread on this but this seems an appropriate place. For the last 10 days or so I have been backing horses which are under 7.0 where the betfair price is lower than the bookies fixed odds in the last 3 mins of betting. The hit rate has been 40% and the profit on $50 bets is over $600.
There are not a lot of them, particularly on the weaker mtgs but since I watch most races for my other strategies it has been interesting. I have read many times that the horses which qualify under this criterion do well but have never tried it before since it would be pretty boring as a standalone method. Yesterday there was not a single selection but usually there are 2 or 3, with more on metro mtgs.