Update Main.cpp

We deleted one side's pawns, exposing its main players. (see ChessPositionBasics.cpp, "set_up", loop 2.)
What are the possibilities available from this position?

See output at:
http://1.bp.blogspot.com/-HErt6f3c-wY/U9imzMzuxSI/AAAAAAAABGM/i4zEWwJ-OIU/s1600/canvas2.bmp

Fantastic!