f there is an airspace (chalal) in the matza, the airspace does not contribute to the shiur kezayis, and he must mash it (to measure it properly>> According to tis if one eats an olive then it is not kezayit (ignore changes in shiurim) since one needs to smash the olive (it is preety squeeshy). At least eggs seem to be less smashable. -- Eli Turkel