Bangkok Post – A Japanese gambler is taking on tax authorities by claiming his bad bets on horse races were a deductible business expense, a report said Wednesday. The man, a civil servant in Hokkaido, won a whopping 7.84 billion yen ($76.9 million) over six years to 2010, but lost 7.27 billion yen in the process, according to the English edition of the Asahi Shimbun. He declared the balance of 570 million yen as “miscellaneous income,” arguing that because his other winnings were cancelled out by his losses, the losing stubbs represented a legitimate cost of his business, the paper…