Hi
could be new kind of bloodsucker, on the other hand this is what the manual says:
"r_ticks(original_price, ticks)
Returns a price that is ticks higher or lower than original_price. If ticks is positive the returned price will be higher, and if it is negative the price will be lower.
For example: r_ticks(6, 4) will return 6.8, and r_ticks(4.1, -5) will return 3.8."
So going back to your question if you can put a limit on how far the market falls:
lets say you want to put a limit of 10 ticks below BSP
and selections back price is greater than r_ticks(actual_sp,-10)
will only bet if the best back price is greater than BSP minus 10 ticks