It's the playing unit that's most often sacrificed in a gambit
It is important that frequent exercises with air defence assets on 
Gotland will be... [DOC] [TLE] Chess (Tabletop Game) - TV Tropes [PAR] The board is orientated so that both players have a white square at the bottom ... 
Usually the second largest piece, and tends to have a small knob on its coronet-
shaped top.