Responding to several comments at once...
Nightriders: The Yeomen on third rank, on the 11x11 board, do help in
slowing down the Nightriders.
Link: It's fixed; thank you for pointing it out.
Pawns and lettering: There were two reasons why I gave the Yeomen a
letter. One was thematic consistency in my eyes...26 letters, 26 pieces.
The other was the lack of suitable 'Y' pieces out there--I tried to avoid
inventing pieces or stretching too far for names, preferring instead to
draw from a rich variety of existing concepts.
Thanks for the feedback!