問題 21020:
問題 21020:
Ian Nepomniachtchi (2751) - Sergey Karjakin (2773)
Saint Louis Rapid 2017 Saint Louis USA (8), 2017.08.16 Nepomniachtchi - Karjakin, Saint Louis 2017
Saint Louis Rapid 2017 Saint Louis USA (8), 2017.08.16 Nepomniachtchi - Karjakin, Saint Louis 2017
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