Whenever a point guard falls out of favor with his coach in New York — and this happens a lot — the Celtics always seem ready to pounce: “With Chris Duhon mired in a slump and Larry Hughes in Mike D’Antoni’s doghouse, Nate Robinson is the best playmaker the Knicks have these days. So why would the Knicks trade Robinson to the Celtics? The Celtics have made an offer to the Knicks for Robinson, according to a reporter for Yahoo! Sports who appeared Tuesday on a Boston radio station. The reporter did not say what the Celtics offered. According to a person with ties to Doc Rivers, the Celtics coach wouldn’t mind getting the chance to coach Robinson, even if he’s high-maintenance. ‘Doc thinks he can connect with anybody,’ said the source.”