Hartong, Jan
1st Prize, Problem (Zagreb), 1951
#2
10 + 11
5862 | An ABC of Chess Problems | 1970 |
721 | Variantim | 1988 |
4640 | Chess Wizardry: The New ABC of Chess Problems | 1996 |
422 | Suomen Tehtavaniekat | 2007 |
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