Puzzle with incorrect solution

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Mairsil1982

So I don't know the puzzle ID here because I was on mobile and my Google-fu did not illuminate for me how to extract the puzzle ID from the app in mobile. Also I have found several other "puzzle isn't right" threads that are usually user error. However, this one is definitely wrong. I'm a relative chess novice, so I'm not claiming "I'm better than the person who built the puzzle", but this is objectively a checkmate that was deemed the wrong move. The "Analyze" button confirmed it, I missed mothing, this is mate... and supposedly incorrect.

Also note that there was no other mate in 1 in this position, so it's not like there were multiple options and they just set the other as correct while this one was "incorrect", whatever other move I could have chosen here would have at least taken longer to produce mate.

llama36

Looks like you gained rating for it though, so maybe the only error is the message.

Mairsil1982
llama36 wrote:

Looks like you gained rating for it though, so maybe the only error is the message.

Potentially, but it was a multi-move puzzle and those will often grant you rating if you get the first few moves correct, so while I don't know if the amount I would have gained would have been different if I got this last move "correct", I think it likely would have been. But that is a valid point, it could just be a display error, but either way it's an error in the app.

Martin_Stahl

Did you make a mistake and retry? 

 

It's this puzzle https://www.chess.com/puzzles/problem/1443506

Your puzzle history on the website shows you got it wrong as well, with 2/3 moves correct.

CCarrionSantiago

From what I have seen, it looks like the error is the message and not the solution. This puzzle is ~1700 and you are 2131, so you received 5 points which is the standard amount you receive when solving a lower rated puzzle.

CCarrionSantiago

 

Tried right now with the link to the puzzle provided by @Martin_Stahl and it gaves me the mate you made with the pawn as correct.

Mairsil1982
Martin_Stahl wrote:

Did you make a mistake and retry? 

 

It's this puzzle https://www.chess.com/puzzles/problem/1443506

Your puzzle history on the website shows you got it wrong as well, with 2/3 moves correct.

No, I spotted this first attempt. But even if I did get it wrong and retry, that's not how the puzzle behavior works, if you retry and get the solution it shows you got it correct even if you lost rating for the puzzle. @CCarrionSantiago 's reply likely shows what happened, that the last move being branded incorrect was just a display error. I'm not worried about the tracking in the system or even my rating, this was more of a bug repot, but if it's just display then not a big concern.

TOM-B-STONE

I have noticed some puzzle errors as well.

EndgameEnthusiast2357

This is the closest thread in time to the present on this issue, so sorry to bump an old thread, but I have occasionally experienced similar puzzle problems. I don't have any saved examples cause I usually just kept going, but I have come across several puzzles that seemed to be very picky about the move order. Note I am not talking about puzzles where you can either win the queen for free or give mate in 1, as obviously the mate in 1 is better (how many points you should lose is another issue), but I have seen a couple where the solution in the endgame would have worked in either move order, yet it marked one wrong. Yes, most of the time the move order does matter and you will see this once you play out the solution, such as the order of the moves resulting in you being able to promote a pawn while simultaneously stopping an enemy pawn from promoting, where this wouldn't work if you switched 2 of moves. But there are some where it shouldn't have mattered at all. Obviously only 1 very specific move order was programmed. Some I also questioned which choice of material gain at the end if a move sequence was actually better in terms of position. Another example would be having to move a king in a certain direction toward a pawn, in most the exact squares will matter, but not always. Next time maybe I will screenshot it.

stevensthalachira
Yes that’s true…
Martin_Stahl
EndgameEnthusiast2357 wrote:

This is the closest thread in time to the present on this issue, so sorry to bump an old thread, but I have occasionally experienced similar puzzle problems. I don't have any saved examples cause I usually just kept going, but I have come across several puzzles that seemed to be very picky about the move order. Note I am not talking about puzzles where you can either win the queen for free or give mate in 1, as obviously the mate in 1 is better (how many points you should lose is another issue), but I have seen a couple where the solution in the endgame would have worked in either move order, yet it marked one wrong. Yes, most of the time the move order does matter and you will see this once you play out the solution, such as the order of the moves resulting in you being able to promote a pawn while simultaneously stopping an enemy pawn from promoting, where this wouldn't work if you switched 2 of moves. But there are some where it shouldn't have mattered at all. Obviously only 1 very specific move order was programmed. Some I also questioned which choice of material gain at the end if a move sequence was actually better in terms of position. Another example would be having to move a king in a certain direction toward a pawn, in most the exact squares will matter, but not always. Next time maybe I will screenshot it.

Very few puzzles have multiple possible solutions and if you run across one that does, it should be reported.

https://support.chess.com/article/1223-how-do-i-report-a-bad-puzzle

If you post it in a forum, a link is better than a screenshot.