I think that's a good reason, if it was true.
Kept getting correct answer in tactics this morning yet system told me answer was incorrect.
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Post an example.
Sep 9, 2018
0
#5
Did you check every instance when you had to move with stock fish? Did it tell you that your move was the top move? If not, then you are incorrect
I think the tactics trainer is racist. Recently, I got a puzzle 80% correct but I lost points. In today's society, doing something 80% correct is OUTSTANDING. If the government was 80% competent, we'd be overjoyed.
This kind of stockfish?
I know. I played a mate move and it be like NOPE -11!!!
yep, the same thing happened to me. Some of those "correct" moves are just bad. An algorithm must be to blame.
Sep 9, 2018
0
#11
If you are doing tactics training on a mobile app, and at some point check the correct answer (using the hint button) and quit without completing the puzzle, and you get the same puzzle again some other day, you get minus points even if you solve it correctly. Somehow the system seems to remember that you checked the hint on that puzzle a few moons ago... 
That's the only thing I can think of assuming you actually did make the absolutely correct move in the puzzle.
There were two puzzles that I remember particularly well. In one of them there were two choices to capture a piece, where only one of them was deemed correct. I checked the position afterwards with the engine, and the difference between those two captures was something like 4.2 advantage or 3.9 advantage. Every other move in the position would've given the advantage to opponent. I don't really see why such puzzle exists in the tactics trainer, if there are two answers that are clearly winning, and it's really a matter of taste, which kind of game you prefer to play. In another puzzle I calculated a clear mate and got the puzzle wrong, because I chose to go for a forced mate in 5, not realizing there was a mate in 3 also. Checked this one with engine as well, and the engine showed mate in 5 on my choice, still deeming it the wrong one. I don't think such puzzles, where there are multiple ways to force a checkmate within few moves should be in the tactics trainer.
goodqueenofthenorth wrote:
yep, the same thing happened to me. Some of those "correct" moves are just bad. An algorithm must be to blame.
Especially after blundering your queen, the next move be like checkmate. Don't they know if you lose the queen, you lose the game?!?
I had one of those moments in tactics training today where I would play a move that was absolutely, 100% correct and yet instead of the system rewarding me for finding the correct answer, the message "incorrect" showed and I lost tactics points...explain. Just because you hate me, and don't want me to improve, does not mean you tell me the correct answer is incorrect when I get it right!