What is perpetual check? I know that there is 6 types of draws including mutual agreement, stalemate, insufficient material, 3 move repetition and the fifty move rule, but I do not know what is perpetual check.
Perpetual check isn't a thing any more. But the idea is that one side demonstrates that they can keep putting the opponent's king in check, regardless of what the response is. Sooner or later it will turn into a threefold repetition or run afoul of the fifty move rule.