The Ephs and the Bobcats first met in 1987.
Williams leads the series 25-1 through 2011-12.
| Year | Winner | Location (W/B) |
Score | Tournament |
| 2012 | Winner | N | 7-2 | NECAC Semifinals |
| 2012 | Bates | B | 7-2 | |
| 2011 | Williams | N | 6-3 | NESCAC Consolation |
| 2011 | Williams | W | 7-2 | |
| 2010 | Williams | N | 9-0 | NESCAC |
| 2010 | Williams | B | 9-0 | |
| 2009 | Williams | N | 7-2 | |
| 2008 | Williams | N | 9-0 | NISRA |
| 2008 | Williams | N | 9-0 | NESCAC |
| 2008 | Williams | B | 8-1 | |
| 2007 | Williams | N | 9-0 | NESCAC |
| 2007 | Williams | W | 9-0 | |
| 2006 | Williams | N | 8-1 | NESCAC Cup |
| 2006 | Williams | W | 5-4 | |
| 2005 | Williams | N | 9-0 | |
| 2004 | Williams | W | 9-0 | |
| 2002 | Williams | W | 9-0 | |
| 2000 | Williams | W | 9-0 | |
| 1997 | Williams | N | 7-2 | Howe Cup |
| 1997 | Williams | W | 7-2 | |
| 1996 | Williams | W | 9-0 | |
| 1995 | Williams | W | 9-0 | |
| 1994 | Williams | W | 8-1 | |
| 1993 | Williams | N | 9-0 | |
| 1992 | Williams | W | 9-0 | |
| 1991 | Williams | W | 9-0 | |
| 1987 | Williams | W | 6-3 |
