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I already have another, probably very easy, for you all again!

Task: State the rule/s that you believe are being broken based on the position and/or what clues I have/you think are being given. You must also use this rule to complete the given game.

The Position:

enter image description here

What To Do: Find four ways for white to checkmate black in one move. It is white to move, of course.

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  • $\begingroup$ Your best puzzle so far IMO. Very well done! $\endgroup$
    – Brandon_J
    Apr 17, 2019 at 17:30
  • $\begingroup$ Thanks! But why this one in particular? $\endgroup$
    – Rewan Demontay
    Apr 17, 2019 at 17:33
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    $\begingroup$ 1. It's very clear and straightforward. 2. The correct answer doesn't use any sort of cheesy loopholes and there is only one correct answer. 3. The correct answer also relates to the title in a clever way that verifies the solution. $\endgroup$
    – Brandon_J
    Apr 17, 2019 at 17:40
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    $\begingroup$ Not that your other puzzles have not done these things, but I feel that this one is exemplary of the above traits. $\endgroup$
    – Brandon_J
    Apr 17, 2019 at 17:40
  • $\begingroup$ I agree. This is a very good puzzle $\endgroup$
    – Artemmm
    Apr 18, 2019 at 3:08

4 Answers 4

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I suspect the broken rule is

jumping over one's own pieces.

Allowing the checkmates

Qh5# or Qh4# or Rh3# or Rh2#

A hint pointing to this answer:

The title is "Tht Aain't right". Notice how the "a" has jumped over other letters in order to move to the right.

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It might be

cylindrical chess

so

the h- and a-file are connected, and you can mate with Qb4-h4, Qb4-h2, Rc3-h3 and Rd2-h2.

This fits the clue in the title insofar that

the 'a'-file lies to the right of the 'h'-file.

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    $\begingroup$ This would lead to at least 7 mates, not 4. $\endgroup$
    – Arnaud Mortier
    Apr 17, 2019 at 15:40
  • $\begingroup$ Did I really miss three additional mates? I still can't see them ... $\endgroup$
    – Glorfindel
    Apr 17, 2019 at 15:43
  • $\begingroup$ There would be additional Q moves, wrapping around along diagonals as well as straight across ranks. (Meta: is it possible to put spoiler tags in comments?) $\endgroup$
    – CJM
    Apr 17, 2019 at 19:05
  • $\begingroup$ @ArnaudMortier Note that the Qa5 can't move to give check without allowing the black king to escape to the a file $\endgroup$
    – isaacg
    Apr 17, 2019 at 19:06
  • $\begingroup$ Another one (not nearly as good as yours or the chosen answer) would be Queens and Kings are allowed to move cylindrically and jump over pieces $\endgroup$
    – Artemmm
    Apr 18, 2019 at 3:15
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Maybe:

Rule:
The towers move like bishops.

So:

Checkmates:
Qa5-f5 # or Qb4-e4 # or Qb4-b1 # or Pg5-g6 #

Because:

Hints:
The third letter of the first word goes to the second letter of the second word (diagonally). The first word begins with T(ower), and does not move to the 'right', but moves as 'aa', letter one plus letter one, letter two, (B)ishop.

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  • $\begingroup$ The towers are both on black tiles, which is also a reason your rule can't work out. $\endgroup$
    – Gust van de Wal
    Apr 17, 2019 at 20:39
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I believe the rules being broken are that

the board is not described traditionally, with the ranks described with letters and the files described with numbers

and

the board was set up with a black square in the bottom right hand corner (1a in this game's notation) rather than white as it should be.

This leads to checkmate by

promoting any of the white pawns to a rook or queen.

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  • $\begingroup$ @RewanDemontay Thank you for your acknowledgement although, to be pedantic, the puzzle doesn't state that the moves are invalid, just that at least one rule is being broken. The layout at the start of the game is a rule of chess. If I'm going to be ultrapedantic, you ask which rule/s are being broken rather than ones which will be broken by the next move. I could also offer the suggestion that the 'A'; has moved $\endgroup$
    – Alchymist
    Apr 23, 2019 at 14:39

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