An off-duty Signal Hill police officer, who was struck in the chest by a shotgun blast in a gunfight with three men who robbed his partner in a restaurant parking lot, was reported in stable condition at Memorial Medical Center of Long Beach. Officer Anthony Giniewicz, 31, was wounded when he returned fire from the three men as they drove away from Charley Brown's Restaurant at 3030 Cherry Ave., Long Beach police said. Giniewicz and his partner, Steven D. Owens, 26, had gone to the restaurant after going off duty. When Owens left a short while later, he was accosted in the parking lot by three armed men who took his wallet and his personal handgun, police said. Owens ran inside to tell Giniewicz about the robbery. When the two went back outside, they were shot at from the car as it pulled away. Giniewicz fired back before he was hit, investigators said. The suspects remain at large.