Perhaps another approach is to ignore "easy" chequer plays, i.e. similar
to cube decisions, only count the moves that can potentially be
misplayed (perhaps were the worst move is more than a certain equity
from the best move)? This would automatically include forced plays.
The problem with this approach is that it is difficult to say which moves
are hard and wich are easy. A middle-game move might be hard even
though the difference between the top-two plays are 0.1 and and
end-game play may be easy even though the difference is only 0.001.
Christian.