Then again, White could have promoted to a Black pawn and Black moved one of them, making it White ‘s turn to move with mate. So it goes either which way really.
I doubt that changing a white pawn into a black pawn would be considered "promoting". Also, there is no definition on how pawns on the back rank move. I don't think Rocky64 would go to this point only to trick us!
Ah now I see it! Well done Rocky64! You tricked me!
(it is in fact similar as to how I perceived the retro-analysis in Andernach chess which turns out to have the same solution)
Took me 15 seconds to solve Rocky 64's problem!
While it's not Andernach, try to solve this puzzle I got published online awhile ago!
Selfmate in just 3 moves!
Please first set the rules straight. Is this a regular selfmate or does it contain irregular promotions or other irregular stuff?
Well take a look at the theme of the mate in one that you solved.
That presumably means it is irregular. Solving selfmates is hard and I don't like to be on the wrong track. I'll give this one a shot.
I got mate in 4: 1. Ka8 Bxc7 2. Qc8 Rxc8+ 3. Rb8 Bxb8 4. axb8=Q Rxb8#
That is more of a helpmate but the assignment here is selfmate - white forces black to checkmate him.
In Rocky's problem, the last move played was a7.
In Rocky's problem, the last move played was a7.
In a standard problem, that is one of the correct options. However, Rocky's problem-type is played with a funny promotion rule - you can promote to a piece of the opposite color. Therefore it is still possible that black played the last move and white is on move!
@Arisktotle Cool! Glad you worked out mine, and it wouldn't have taken you long after the hint that there's a bit more to the problem than at first sight! I'll post the solution later, in case Rewan or anyone else wants to have another go.
Is it black pawn promotes to white rook at a1 allowing white to move a7xb8 promotes to black rook #
YEP!!!
LOL How would an andernach game position be to proof.... I would guess this having many laughable arguments in OTB games with a friend...........I think that if any player in a sanctioned tournament actually changed his promoted pawn to his opponents piece to win the game, (because there was no rule against it) I think it would be much more famous and easy to find in tournament history.A chess composers dream move.
Andernach is different from the wrong color promotion rule but they overlap in problems like RewanDemontay's and Rocky64's.
I once made a series of Andernach SPGs and it is interesting stuff. Nice effects like the same pawns moving forward and backward in different color jackets.
I suppose someone captures a rook and promotes to a rook of the same color!? (4 solutions)
Agreed, just like this one:
White to move mate in 1...
B8 = black knight
White to move mate in 2...this one can actually be proven correct.
And is this one mate in 2 ... and can it be proven correct?
And, is there a mate in 2 here?
@RewanDemontay: I finally solved your selfmate in 3! Very nice! Three different underpromotions and only one move is a check!
@RewanDemontay That's really close but not quite!