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***** <span id="RPenrose"></span>[https://en.wikipedia.org/wiki/Roger_Penrose Roger Penrose (1931)] [https://genealogy.math.ndsu.nodak.edu/id.php?id=36928 ¶] ([https://en.wikipedia.org/wiki/University_of_Cambridge University of Cambridge]) » [[Chess Problems, Compositions and Studies#Penrose|Penrose Puzzle]]
****** <span style="background-color: #ffffac;">[[Matthew L. Ginsberg]]</span> [https://genealogy.math.ndsu.nodak.edu/id.php?id=71300 ¶] ([https://en.wikipedia.org/wiki/University_of_Oxford University of Oxford]) » [[Backtracking]], [[Bridge]]
****** <span id="APHodges"></span>[https://www.synth.co.uk/ Andrew Hodges] [https://genealogy.math.ndsu.nodak.edu/id.php?id=49353 ¶] ([https://en.wikipedia.org/wiki/University_of_London University of London])
****** <span style="background-color: #ffffac;">[[John Moussouris]]</span> [https://genealogy.math.ndsu.nodak.edu/id.php?id=156035 ¶] ([https://en.wikipedia.org/wiki/University_of_Oxford University of Oxford]) » [[CHEOPS]]
*** <span id="Forsyth"></span>[https://en.wikipedia.org/wiki/Andrew_Forsyth Andrew Forsyth (1858 - 1942)] [https://genealogy.math.ndsu.nodak.edu/id.php?id=17829 ¶] ([https://en.wikipedia.org/wiki/University_of_Cambridge University of Cambridge])
