By a stale board I mean a board state where there are no sensible moves in order to create an advantage. i.e. there are no good pawn moves, no good knight or bi

By a stale board I mean a board state where there are no sensible moves in order to create an advantage. i.e. there are no good pawn moves, no good knight or bishop re-positions, castles mostly stuck and the engine pretty much shows no point difference.