Although it is not possible to predict the outcome of a particular case, you do have a strong case for adverse possession because you have satisfied the following requirements:Continuous possession of the property for 20 years; you were the exclusive possessor and actually entered the property; your possession was seen (it was open and notorious); your possession was appropriate to the type, size and use of the land (the shed, underground sprinklers, etc.); shed, fire pit, swing set, sandbox, etc. gave the owner reasonable notice and a reasonable opportunity to eject you; your possession was adverse to the owner's claim.MA has a special land registration system in which a question of title can be brought to a land court which evaluates and investigates the merits of the claim.  d on its findings, the court can issue a new certificate of title.  However, this could also be used as a defense by the true owner because property registered  through the land court cannot be adversely possessed.