Albert Becker vs. Paul Keres. 1st round, Zandvoort International Chess Championship, July - August 1936. (Collection Max Euwe Centrum, Amsterdam)
Unknown photographer
<a rel="nofollow" class="external text" href="https://maxeuwe.nl/wp-content/uploads/2022/09/Digi_Nieuwsbrief_sep_22.pdf">Nieuwsbrief Max Euwe Centrum, 2022</a>