The below comes from Dave Renhams blog see horse racing blog

The favourites stats are based on many years historical research.

( his members get much more detail including strike rate and return on investment etc )

As for the In running notes.

The rough idea with these is to back them pre race and lay them back in running. The rough logic behind them is that these horses are assessed by Dave’s research as prominant front runners and are therfore likely to trade at lower when betting in running compared to pre off prices.

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Best races for favourites:

Newmarket  1.55

Newbury 2.45, 5.05

Haydock 6.40

Lingfield 6.50, 7.20, 7.50

In running notes

Horses I expect to trade lower “in running” – offering either free bets nothing or arbing opportunities to win money whatever the result:

3.25 Ripon Templetuohy Max

5.15 Newmarket Sutton Veny

6.50 Lingfield Sermons Mount

8.10 Haydock Welsh Emperor