Thomas, who made 39 saves overall, turned aside shot after shot in the final period as the Caps struggled to break a seven-game losing streak. But in the end, he allowed only a single third-period tally, to Karl Alzner, which brought Washington to within one.
The Bruins got a goal and an assist each from Patrice Bergeron and Blake Wheeler. Andrew Ference added a first-period goal as Boston snapped a three-game losing streak.
Michal Neuvirth turned aside 18-of-21 shots, but it wasn't enough to stop the Capitals' slide, which reached eight straight games with the latest setback.
Britney Spears on kissing Ryan Gosling, Justin Timberlake in the Mickey Mouse Club
18-year-old elf alleges mall Santa pinched her buttocks on the job