TY JOUR TI PEDAGOGICAL MODEL OF DIFFERENTIATED TRAINING OF CHESS PLAYERS USING INDIVIDUAL TASKS KW chess players KW pedagogical model KW chess competitions KW differentiated training KW use of individual tasks JO Scientific notes of P. F. Lesgaft University AU Sushchenko, V.P. AU Bolotin, A.E. AU Martynov, P.N. PY 2023 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft