TSN suggests that one reason the Blackhawks haven't announced the signings of Patrick Kane, Jonathan Toews and Duncan Keith to long contract extensions could be what the NHL calls ``tagging room.'' The seldom-used term is the available salary cap space for next season, which is difficult to determine. It's calculated by totaling the dollar values of the contracts that will expire at the end of the season plus available salary cap space now available. The Hawks apparently don't have much ``tagging room'' now and TSN predicts that one way to get more would be to move veteran defenseman Brent Sopel. He represents and $2.33 cap hit for the Hawk both this season and next, which is quite a bit for a depth defenseman. Sopel, out most of last season after elbow surgery, has played in 19 of this season's 20 games.