Black to Play, Mate in 6 Moves, from a Real Chess Game
This is from a blitz game that I played on the internet. I was lucky enough to be Black here, and played the key move, which was somewhat intuitive. Then my opponent thought for about ten seconds and resigned. Later on, I analyzed the game with a chess computer and it saw something I did not see, a mate in six. Of course, I felt it was winning at least...I was a piece up at the time and just wanted to trade down. (I doubt my opponent saw the mate, too.)
I saw the evaluation number indicating mate, but I did not look at the line the computer gave, so I stared and stared until I found it. It had much deeper content than I thought it would.
Turns out, the best defense for White was a little shocking to me and the follow-up for Black to achieve the mate in the allotted number of moves was not so easy to spot.
The finale, at least in the line I have analyzed, is very pretty. I haven't checked it for flaws or by-play. Still, not bad from out of the blue.