Calcutta, Feb. 24 :     Satrajit Lahiri's unbeaten 112 took Sporting Union to a three-wicket win over Shibpur Institute in a CAB first division championship play-off match today. Yesterday, left-arm spinner Prabir Mukherjee (not Acharya, as reported) took eight for 101 to bowl out Shibpur for 273. Sudip Mitra of Sporting Union made 79.