This function returns the number of moves played in each game. The function accepts a vector of chess Moves data in PGN notation, usually called 'Moves'
return_num_moves(moves_string)
A character vector of chess Moves data in PGN notation usually called 'Moves' in extracted data
A numeric vector of the number of moves in each game
if (FALSE) {
return_num_moves(moves_string = df$Moves)
}