Abstract: A computer-based method for finding a compatible partner for a user includes: determining one or more of a birth card (BC) of the user and a planetary ruling card (PRC) of the user; if a desired connection is a friendship connection or a romantic connection, representing one or more of the user's BC and the user's PRC as Mi,j, where i and j are indices of one or more of a spiritual spread of the user and a life spread of the user: representing with blank cards birth cards that have diagonal element indices that fall outside a spread; removing the blank cards; using remaining elements, computing remaining compatible diagonal elements; and adding the compatible diagonal elements to the compatible cards array, so as to compute compatible diagonal elements for one or more of the user's BC and the user's PRC.