AUSSIE GAMBLE BAFFLES BOOKIES Australian challenger Logician was today the subject of an ante-post gamble with Coral for the Tote Cheltenham Gold Cup.Logician, who is being stabled at Ian Balding`s yard, was backed with Coral Eurobet at 100/1, 80/1 and 66/1 before settling on 50/1. The run of money was reported to have been caused by a tipping line.'The tipping line concerned has not got a particularly fearsome record with its ante-post gambles, but when loads of their subscribers come on to take 100/1, the price invariably doesn`t last too long,' said Simon Clare, Coral Eurobet spokesman.Coral betting: 9-4 First Gold, 6-1 See More Business, 8-1 Cyfor Malta, 9-1 Marlborough, 10-1 Beau, Rince Ri, 14-1 Legal Right, Nick Dundee, 16-1 Florida Pearl, 20-1 bar.