ɪɾ ɪz hɪstˈɔːɹɪkli kənsˈɪdɚd ðə fˈɜːst "sˈɪksθ ɡɹˈeɪd" ɪn sˈɪkstˈɪɹ skˈeɪl ʌv ˌælpɪnˈɪstɪk dˈɪfɪkˌʌltiz pɹəpˈoʊzd baɪ wˈɪloʊ wˈɛlzənbˌɑːx kˌɔːɹɪspˈɑːndɪŋ tə fˈaɪv.nˈaɪn.
It is historically considered the first "sixth grade" in six-tier scale of alpinistic difficulties proposed by Willo Welzenbach (corresponding to 5.9).