By Simon Evans DENVER, Colorado, March 23 (Reuters) - After a week surprisingly dominated by talk of rifts and lack of player confidence in coach Juergen Klinsmann, the United States gave a characteristically battling display to beat Costa Rica 1-0 in driving snow. There was nothing to learn about Klinsmann's tactics, about the nuances of team formation in Friday's game which, in many other circumstances, may have been halted due to the snow-covered field. Arguably, Klinsmann's biggest mistake when taking over the U.S. ... More...