The Boston Bruins signed veteran center Dominic Moore to a one-year contract worth $ 900,000 on Tuesday. The move gives head coach Claude Julien quite a few centers to worth with when training camp and the preseason begin. In addition to having two legitimate top-six centers in Patrice Bergeron and David Krejci, the B’s signed free-agent center David Backes in July and need to find a spot for young center Ryan Spooner to continue his development. Noel Acciari and Riley Nash also are capable of playing down the middle. One or more of these centers might have to play on the wing, but it’s not a bad problem to have. The Bruins