Boston U. at HARVARD  Yale at Cornell  Columbia at Dartmouth  Pennsylvania at Lafayette  Colgate at Princeton  Dukakis at Bush  Last Week  Year to Date Mark T. Brazaitis Sports Editor  Boston U. 28-27  Cornell 24-14  Dartmouth 34-16  Lafayette 28-20  Princeton 35-14  Bush 472-66  5-1  30-12.714 Casey J. Lartigue Jr. Assoc. Sports Editor  Boston U. 34-20  Yale 35-22  Dartmouth 6-2  Pennsylvania 21-16  Colgate 45-31  Bush341-197  4-2  27-15.643 Julio R. Varela Asst. Sports Editor  Harvard 35-33  Yale 17-16  Dartmouth 45-38  Pennsylvania 35-17  Princeton 28-17  Bush 400-138  2-4  22-20.524 Brooke A. Masters Executive Editor Ever Hopeful  Boston U. 27-21  Yale 24-21  Columbia 20-14  Lafayette 24-17  Colgate 31-24  Dukakis 280-258 Brian M. Byrne Pressman Extraodinaire Byrne Baby Byrne   Boston U. 30-7  Cornell U. 21-3  Columbia 7-6  Lafayette 54-12  Colgate 21-20  Bush 425-113