mangue: There is no automatic draw in chess, you have to claim a draw.

This is just wrong. If a position arose where no side can force a checkmate with any way, e.g because insufficient material occurred in the board, then it's an automatic draw no matter what. Even if one player loses on time it is still a draw. Such positions are called dead.

Imagine e.g a KNK position and the side with the single King to run out of time. Well it's still a draw.

there is almost no draw in dark chess, because you can never know if the 50 rules exist (how can you be sure your opponent did not move a pawn). So even after playing 500 moves, if your opponent still refuses to draw, you can do nothing.

But if you do not know if the opponent moved a pawn, you cannot claim a draw.

It is like the 3 times the same position. In dark chess, you often do not know what the opponent moved, so it is impossible to claim it.

Since in Dark Chess an arbiter is mandatory to exist to supervise the game and guarantee whether the rules are followed, it's easy to create a modification rule to the official Chess 50-move rule that could say, "If a position has arisen where no Pawn move and piece capture has taken place in the last 50 moves of both players, then game is a draw.".

No need for a player to ask about a draw.