Just to let you know - "incorrect" and "try again" are different for chess mentor, which is a great tool, probably the best tool for diamond members on this site.
Incorrect means you lose points for a move that is a mistake, while try again is like an alternative move - one that also wins. You did not lose points for this.
I yelled BS when it said try again. So I put this into the computer at the hardest difficulty and won.
I should get points for that move because I can win .