Isaev, Leonid Antonovich
1st Prize, Tijdschrift vd NSB, 1927
#2
12 + 12
20 | De Problemist | 1929 |
1397 | Faszinierendes Schachproblem | 1963 |
3098 | FIDE Album (1914-1944) (I) | 1971 |
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