00780naa#a2200181#i#450# EN\\bibl\123356 20260706063018.1 1994-4683 20230731b2023####ek#y0engy0150####ca RU PSYCHOLOGICAL AND PEDAGOGICAL CONDITIONS NECESSARY FOR THE INITIAL PREPARATION OF CHESS PLAYERS FOR COMPETITIONS USING INDIVIDUAL TASKS Journal article Moscow National State University of Physical Education, Sports and Health named after P.F. Lesgaft 2023 3 с. Journal article local Спортивная тренировка. Методика. Нагрузка. Спортивные результаты. 796.015 Bolotin A E Martynov P N uchzapiski.lesgaft.spb.ru