Hi Mark,
Actually, I don't need a back trigger, just a lay trigger to lay a bet equal in amount to the previous back bet from my existing trigger.
The existing back trigger could bet on either of the two players.
So, how it works is after my back trigger fires four times the lay trigger I need will place a lay bet at say 4 ticks lower than the odds the existing back trigger and ad same amount.
example:
Bet 1 £10 back bet by existing trigger
Bet 2 £15 back bet by existing trigger
Bet 3 £20 back bet by existing trigger
Bet 4 £25 back bet by existing trigger @ 1.80
New lay trigger
Bet 4a £25 lay bet by new lay trigger @ 1.76
if the existing back trigger fires again then cancel the unmatched lay bet
as below.
Bet 5 £30 back bet by existing trigger @ 1.64
Bet 5a £30 lay bet by new lay trigger @ 1.60
if the new lay bet is matched then do nothing until existing
back trigger fires again, in which case repeat process.
So, only a lay trigger required.
Hope that is a bit clearer and apologies for any murkiness
Thanks
R