Patrick Sharp is one of the best left wings in the league. But he also has been a better-than-serviceable center for the Blackhawks. The Hawks won the Stanley Cup with Sharp as their second-line center, and it's his ability to play multiple positions that makes him so valuable. But coach Joel Quenneville hasn't used Sharp at center at all this season, even while testing a multitude of line combinations during the Hawks' losing streak. Is there any particular reason? ''That's a good question,'' Quenneville said before the Hawks' skid reached nine games with a 3-2 loss Tuesday to the Nashville Predators. ''I think [Marcus Kruger] has done a decent job there [at second-line center]. It's still an option.''