Mate in 6. Masters only! :D

Stockfish thought the shortest checkmate was a mate in 4.

not mate?

I annotated the checkmate ‘!?’ because you can never ever promote into a Black piece.

Charosh Study

Question: How could it possibly be a mate in 0 here?

There is only one move each time!??! 1. d4!! is mandatory!

Oh black knight, that makes more sense 

Obviously, white plays "top" to "bottom". Black is already checkmated which could be interpreted as "checkmate in 0". However I assume that the idea of the composer is that you can prove the diagram position is "illegal" if white plays "bottom" to "top". That part can't be right since the diagram is illegal from all orientations. Most importantly because the white king is missing! Or is there some other joke involved as well?

Yes. The solution was that the board was backwards. I did not put any coordinates there as a trick.

This is even harder Stockfish swore so badly after I told the solution.

Question: White mates in 2.

#70

1. e8 = (Black king) Kd8 (new king moved) 2. Qd8# checkmating both kings at the same time.

I failed initially with e8=(Black bishop) and had to think a little further for this. I also had to first confirm that the coordinate axes were in the "correct" orientation.

I failed it as well by playing 1. Kh8 (teleporting to the other side) in a "continuous" board.

Yes, that part is clear. But why is the white king missing? Most likely you made a mistake in the diagram. Probably even more than one mistake as you'll need to prove that white can't play "bottom to top" after you added the king which is impossible!

Puzzle 3: White Mates in 1

I never made a mistake. Normal chess rules don’t apply in that puzzle so it was okay for that to happen.

Wow that was incredibly difficult

Do you need the solution?

It was sarcasm, as it was with most other people you've been telling the solution to.

Easy. 1...Kxc7 2. bxa8=N#. Or 1...Kxa7 2. b8=N#.

(White mates in 1, but there is no indication that it is White to move in the position)

There is. If it was White’s move. Black’s king would’ve gone to b8 last which is impossible.