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P., J. Chess Problems. Nature 246, 388 (1973). https://doi.org/10.1038/246388a0
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DOI: https://doi.org/10.1038/246388a0
Chess Problems
Nature volume 246, page 388 (1973)
Nature volume 246, page 388 (1973)
P., J. Chess Problems. Nature 246, 388 (1973). https://doi.org/10.1038/246388a0
Issue Date:
DOI: https://doi.org/10.1038/246388a0
