Crossword puzzle clue "chess player's friend"

Artist and chess player who said "While all artists are not chess players, all chess players are artists"

Chess player's friend?

Friend of a friend of a friend, perhaps

Chess expert's requirement for attending a chess tournament?

Basketball player Walton + basketball player Westbrook = basketball player ___

Once-per-player chess move

Chess player's warning

Chess player accidentally pushes pawn, gets charged with ...