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In the rules for knightmate chess this is written: following standard castling rules [ ] no square between the knight and the rook may be attacked by an opponent's piece). But this is not standard. The standard rule is that castling is legal if b1 or b8 is attacked. Is this contravened in knightmate chess?
Normally if I click a pawn it moves automatically if it only has one available move, so in dark chess to check for possible en passants it wasn't necessary to try the second stage of the move, I only needed to see that the pawn didn't automatically move. Dark chess players should be aware that this is no longer the case (my opponent has just played c6 when I falsely deduced that he must have played c5 on the previous move). We can also select a pawn even if it has no legal move!
It's just occured to me that this could be a game if it's played in matches of one with each colour and the aim is to win in the fewest moves, (as black of course).
I think it's very unlikely that this is a game in the competitive sense. It seems to me most likely to be a way to introduce complete beginners, probably children, to the moves of the chess pieces. The beginner of course takes black and the teacher white, shogi has a comparable teaching tool in which the beginner has a full set of pieces while the teacher has only a king and three pawns in hand.
In fact the full story with shogi is that a draw by repetition only occurs if it doesn't involve continuous checks, perpetual check loses for the checker because the draw isn't by mutual intent.
In chess the situation is resolved after three repetitions of position with the same side to move, in effect this is a way of avoiding the situation continuing indefinitely. In this case in loop chess the situation will not continue indefinitely so there would be no logic to call such a case a draw. Shogi re-uses captured pieces and has done so for 400 years, this gives shogi a species of seniority for these kind of cases, in shogi the number of pieces must also repeat.
It's an interesting point. With plenty of pieces still on the board I think two checks is usually good value for a piece. One check can go either way so involves delicacy of judgement.