Sancho 1.2.2 - fixed shallow minimax for best move
Snacho 1.1.2a - removed incorrect and expensive back propagation across transpositions
Sancho 1.1.2b - interim update to MCTS propagation methods
Sancho 1.23 - statistical correction to transpositional back prop + fixed handling of games where multiple moves can transition from a start state to the same target state