Morgantown, W.Va. (AP) - They've been full-fledged casinos for just two weeks, but northern West Virginia racetracks say the gamble on table games is already paying off - with renewed interest in slot machines. Slot play at Mountaineer Race Track & Gaming Resort in Chester has surged 13.6 percent since the Northern Panhandle track opened 37 poker tables Oct. 19, track spokeswoman Tamara Cronin said Friday. That's compared to the same period last year.