Scoop:
If you want to sound like a townie at the game, the battle cry is "Go Broooonz!"
If your only purpose in Boston proper is the game, I'd recommend a stay west of Boston. Ride the MBTA (subway) Green Line. If your train doesn't take you to North Station (I believe many stop at Government Center) it is no problem getting to North Station, on another train across the platform.
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"I will not be pushed, filed, stamped, indexed, briefed, debriefed or numbered. My life is my own."