dʒˈaɪɡæks hæd dɪvˈɛləpt ɐn ˈɪntɹɛst ɪn mˈɪnɪtʃɚ ɡˈeɪmz, sˌoʊ hiː ænd dʒˈɛf pˈɛɹən dɪzˈaɪnd ɐ sˈɛt ʌv mˈɛdɪˌiːvəl mˈɪnɪtʃɚz ɹˈuːlz kˈɔːld tʃˈeɪnmeɪl wˌɪtʃ wʌz fˈɜːst pˈʌblɪʃt ɪnðə kˈæsəl ænd kɹuːsˈeɪd səsˈaɪəɾiz fˈænziːn ðə dˈoʊmsdeɪ bˈʊk.
Gygax had developed an interest in miniature games, so he and Jeff Perren designed a set of medieval miniatures rules called 'Chainmail' which was first published in the Castle & Crusade Society's fanzine The Domesday Book.