enum BG::
Position of probabilities in CubelessProbs.
WIN = 0 Player to move wins
WINGAMMON = 1 Player to move gammon wins.
WINBACKGAMMON = 2 Player to move backgammon wins.
LOSEGAMMON = 3 Player to move gammon loses.
LOSEBACKGAMMON = 4 Player to move backgammon loses.

typedef float BG::CubelessProbs [5]
Cubeless Probabilities generated by Neural Nets.

bool BG::operator ==(Board const& b1, Board const& b2)
Compare two board for equality.