Weekend afternoon playoff games were shown by the network; the same pattern continued through the season. CBS did manage to televise the 1971 Stanley Cup Finals clincher on a Tuesday night and the 1972 Stanley Cup Finals clincher on a Thursday night. In 1971, CBS was not scheduled to broadcast Game 7 of the Stanley Cup Finals, but showed the prime time contest (the first ever occurrence of a NHL game being nationally televised in prime time in the United States) between the Montreal Canadiens and Chicago Black Hawks after fans reportedly swamped switchboards at network headquarters in New York City asking that the seventh game be televised. Ironically, the game was not telecast by CBS' Chicago owned-and-operated station WBBM-TV, nor on CBS affiliates in most of Illinois, and parts of Indiana, Wisconsin and Iowa, due to Blackhawks' owner Arthur M. Wirtz policy of not telecasting home games. While Dan Kelly once again handled all of the play-by-play work, Jim Gordon replaced Bill Mazer in . For the CBS' Stanley Cup Finals coverage during this period, a third voice was added to the booth (Phil Esposito in 1971 and Harry Howell in 1972).