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06-04-2020 Alexei Chizhov:
Correct name is Korepanov Nikolai. This wrong name is probably taken from V.Bulat / T.Berends book "300 komposities Deel 1" In 80's Nikolai was my draughts student in Izhevsk, Russia and all his compositions Vadim Bulat received from me (together with my compositions). Please correct!
09-04-2020 Piet Bouma:
Okay, Alexei I have made correction. Accidently I saw you remark. Better is to e-mail correction(s).
10-04-2020 Hanco Elenbaas:
Korepanov is volgens Chizhov co-auteur van deze bekende compositie van Chizhov:  https://toernooibase.kndb.nl/posities/opvraag/applet.php?taal=&idapplet=100333
12-04-2020 Alexei Chizhov:
Thank you for correction Piet! And yes my "tienklapper" was done together with Nikolai Korepanov.