Crawford, et ux. v. Comr., T.C. Memo. 2010-54

(professional gambler subject to the limitations of I.R.C. Sec. 165(d) and cannot deduct net gambling losses; U.S. Supreme Court's opinion in Groetzinger defining the phrase "trade or business" only defined in context of I.R.C. Sec. 56(a) and Sec. 165(d) applies regardless of whether petitioner is in the business of wagering).