Peculiar Patriots' Day

I'm a little thrown off writing one of these in the middle of the day versus the middle of the night, but I feel what just happened is rare enough to warrant it.  The Tampa Bay Rays beat the Boston Red Sox 1-0 on Patriots' Day in Boston.  For those not familiar, Patriots' Day is a holiday celebrated mainly in New England, and more specifically Massachusetts, to remember the start of the Revolutionary War.  In the Boston sports world, the Boston  Marathon is run every year on this day, and the Boston Red Sox almost always play a home game at Fenway Park, starting at 11:00 am.

It's only 1:00 pm out here on the west coast, and the Rays-Red Sox game of today has been over for quite some time already.  This was the fourth of four games in the series, and the Rays were looking to avoid a sweep.  The Red Sox compiled 25 runs between Friday and Saturday's game, and tacked on an additional 6 on Sunday. So what made today so rare?  They Ray won the game 1-0.  More noteworthy is that they scored their lone run on a bases loaded walk.

The Rays actually collected 7 hits on that day; however, only one game in the 7th inning when Red Sox starting pitcher Daniel Bard walked three others, including Evan Longoria with the bases loaded to score the lone run of the game.  Longoria's walk came on Bard's 111th and final pitch of the game.  Sean Rodriguez would be credited with the run scored.

I don't know if anyone else knows any history behind these events.  I couldn't find anything referencing games where the lone run was scored by a walk, but I have to imagine it is rare.  Moreover, I would love to find out just how rare it is.