Kubbel, Leonid Ivanovich (AKA Kubbel, Karl Artur Leonid)
Deutsche Schachzeitung, 1907
#3
8 + 8
1829 | The Theory of Pawn Promotion | 1912 |
6490 | yacpdb | 2009 |
23 | Die Schwalbe | 2018 |
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