@Sarg0n FIDE rules (www.fide.com/FIDE/handbook/LawsOfChess.pdf) implicitly refer to "helpmate" and not simply "checkmate". Article 6.9 reads:
>... the game is drawn if the position is such that the opponent cannot checkmate the player's king by any possible series of legal moves.
Note that there exists a "checkmate ... by any possible series of legal moves" if and only if there exists a "helpmate".
I did not completely understand your point. Could you elaborate?
>... the game is drawn if the position is such that the opponent cannot checkmate the player's king by any possible series of legal moves.
Note that there exists a "checkmate ... by any possible series of legal moves" if and only if there exists a "helpmate".
I did not completely understand your point. Could you elaborate?