The spelling of the word "haddest crack" follows the conventions of Middle English, which was spoken from the 11th to the 15th century. The IPA phonetic transcription for "haddest" would be /ˈhædɪst/, with emphasis on the second syllable. The "dd" in "haddest" represents the Middle English "th" sound, which is often pronounced as "d" in modern English. "Crack" is pronounced as /kræk/. Overall, the pronunciation of "haddest crack" would be similar to "hadd-ist krack" in modern English.