Willem Koomen vs Adrianus Dingeman de Groot - Hoogovens 1946.01.08
Willem Koomen vs Adrianus Dingeman de Groot Hoogovens Beverwijk NED round 4 1946.01.08 Grünfeld Defense: Botvinnik Variation 1-0 https://www.chessgames.com/perl/chessgame?gid=1273273
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Willem Koomen vs Adrianus Dingeman de Groot - Hoogovens 1946.01.08
Willem Koomen vs Adrianus Dingeman de Groot Hoogovens Beverwijk NED round 4 1946.01.08 Grünfeld Defense: Botvinnik Variation 1-0 https://www.chessgames.com/perl/chessgame?gid=1273273
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