If the uci option 'Best Book Move' is set to true the lookup still
returns a move at random instead of the move with the highest
weight.
No functional change.
// Choose book move according to its score. If a move has a very
// high score it has higher probability to be choosen than a move
// with lower score. Note that first entry is always chosen.
- if ( (sum && rkiss.rand<unsigned>() % sum < e.count)
+ if ( (!pickBest && sum && rkiss.rand<unsigned>() % sum < e.count)
|| (pickBest && e.count == best))
move = Move(e.move);
}