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I had a rather odd idea today. On my own, I came up with a mate in two scheme that uses a fairy chess piece, along with a new puzzle theme. The idea is that you must figure what fairy piece is going to be used-changing a piece or by promotion-or is being used-intution based on the position and goals of the puzzle. Since this could get a bit broad, I'm limiting my usage to what can be found in the Wikipedia list of fairy chess pieces to narrow it down. I shall strive to make it not impossible to solve.

Thus, I present my original puzzle

Mate In 2, Black To Move:

FEN: 8/1p5p/8/8/2p1k1p1/8/3PKP2/2b3q1 b - - 0 1

EDIT: Gareth McCaughan has noticed a flaw, so here is a fix.

The Fix: The board is from White's POV. The 7th rank black pawns, and only those black pawns, may move up onto the 8th rank to promote. All of the other pieces move normally.

It is strange, but it is nessecary to get the idea behind the puzzle out. The pawns themselves are not the solution, although they would technically count as fairy pieces.

Identify the fairy piece that will be promoted. Give an explanation for your answer. You must also solve the mate in two-there is a total of four solutions possible.

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  • $\begingroup$ Image is in. :D $\endgroup$ – Brandon_J Jun 8 '19 at 1:42
  • $\begingroup$ Thank you very much my friend! $\endgroup$ – Rewan Demontay Jun 8 '19 at 1:47
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    $\begingroup$ Just to be explicit: this position is shown from Black's perspective, right? (Otherwise it's hard to see how any promotion can be relevant to a mate-in-two puzzle starting here.) $\endgroup$ – Gareth McCaughan Jun 8 '19 at 1:49
  • $\begingroup$ Gah humbug. My scheme here is done for. I'll just add an a "fix" of sorts. It's from White's view.... $\endgroup$ – Rewan Demontay Jun 8 '19 at 1:55
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    $\begingroup$ This puzzle would very likely benefit from a major redesign; the basic idea (I assume there's a french-named capture involved) is solid, but in addition to the bizarre stuff with the black pawns promoting on the 8th rank, it can't be black's turn to move because otherwise white's previous move could only have started at an illegal position. $\endgroup$ – Bass Jun 8 '19 at 2:27
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1... h8=Nightrider+
2. f4 NRxf4#
A nightrider is a fairy chess piece that moves as follows: "A nightrider moves any number of the knight's moves in the same direction. A piece in its path of the opposing color could be captured, but the nightrider could not move any further."

Of course this assumes that for some reason the white and black pawns both move upwards, as stated by the OP.

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  • $\begingroup$ @rewan But the white pawn on f2 needs to move upward to f4, which is strange if the black pawn also moves upwards. Perhaps if you changed the pawn on f2 to a rook, then the board could be from black's perspective. $\endgroup$ – JS1 Jun 8 '19 at 4:17
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Assuming black pawns move upwards, I think promoting either pawn into a Lolcat should do the trick in one move.

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  • $\begingroup$ So mate in one isn't good enough?. Hmh. $\endgroup$ – Bass Jun 8 '19 at 2:14

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