Sir Richard William Barnes Clarke (13-viii-1910 21-vi-1975), National Portrait Gallery, Walter Bird BCN Remembers Sir Richard William Barnes Clarke KCB OBE (13-viii-1910 21-vi-1975) According to chess-poster.com : "He was commonly known as Otto Clarke” Here is his Wikipedia entry Here is a small article from chess-poster.com Here is detail about the Clarke Grading System and more about chess ratings systems in general From The Oxford Companion to Chess by Hooper & Whyld : Creator of the British system of grading.…