Yesterday when solving puzzles I faced a puzzle (1423272) that seems to be broken as having an alternative soltuion that is not accepted.
The expected solution is
1. Rd7+ Ke8 2. Re7+ Kxe7 3. Qd7+ Kf6 4. Qf7#
However, from move 2 there is a variation with the exactly same and equally fast ending
2. Rd8+ Ke7 3. Qd7+ Kf6 4. Qf7#
The second solution is not accepted even though it is easier to find. In fact, with the second solution being pretty straightforward, I don't think the puzzle difficulty rating would be 2966 with it.
If you run across puzzles like that, you can directly report them.
https://support.chess.com/article/1223-how-do-i-report-a-bad-puzzle
I have reported it.
Yesterday when solving puzzles I faced a puzzle (1423272) that seems to be broken as having an alternative soltuion that is not accepted.
The expected solution is
1. Rd7+ Ke8 2. Re7+ Kxe7 3. Qd7+ Kf6 4. Qf7#
However, from move 2 there is a variation with the exactly same and equally fast ending
2. Rd8+ Ke7 3. Qd7+ Kf6 4. Qf7#
The second solution is not accepted even though it is easier to find. In fact, with the second solution being pretty straightforward, I don't think the puzzle difficulty rating would be 2966 with it.