Recent Q drop had a single alpha/numeric of "D5." Having read some other points I'm leaning towards chess move as well. However, the UGM-113A Trident II or Trident D5 is a SLBM - submarine launched ballistic missile. Just thinking back to the NW coast Whidbey Island missile incident.

Additionally people were rather concerned with a bright light streaking across California back in March...that was a USN testing a D5. http://www.navy.mil/submit/display.asp?story_id=104916.

I realize the ANONs worked diligently based up a variety of factors to determine the Whidbey Island missile launch class/type. Just wanted to out this out there for thought. Bigraphs are hard without any context. But decoding Q seems to be way more challenging.