by eelgc
A small doubt I had last time I played.Knowledge tile 8 states: The player who adds this tile to his estate may adjust a die result by up to +/- 2 per worker tile that he pays.
Knowledge tiles 9-12 all allow you to adjust your die by +/- 1 "just as if he had used a worker tile for them" for different situations (e.g. placing building tiles for knowledge tile 9).
Presumably this means these stack? E.g. if you have both 8+9 you can adjust your die results by +/- 2 whenever you place a building without using any workers?