Is 20.g6# uncommon? 
It was a 'serious', OTB, 15+0 game, me vs. my schoolmate, 4 years ago already. However, cannot really find any special checkmate in my database with king or castling.
Is 20.g6# uncommon? 
It was a 'serious', OTB, 15+0 game, me vs. my schoolmate, 4 years ago already. However, cannot really find any special checkmate in my database with king or castling.
I have about 20 instances of g6# in my database. I was surprised to see that I won nearly every one of these, regardless of color. That's in a database of mostly blitz games that has nearly 80,000 games. In one of these, two bishops on the f-file assisted in confining the King on the h-file.
It's uncommon enough.
Thanks for raising this interesting topic. As Black, I try to play the Scandinavian defense exclusively against 1. e4 and if I am allowed to pin the Nf3 with my B (and soon thereafter Q), I usually castle queenside... sometimes with disastrous results. 
John Gallagher has a nice chapter in his pocket book 101 attacking ideas. If I find it Ill post it.
I think that I have that book, although I haven't read it.
Here's another one.
Ke7#
Yes, you saw that right. King gives a checkmate to an opposing king by a discovered checkmate. It's still a checkmate by a king technically because without the king moving there would be no checkmate!!!
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Most chess players are familiar with the Ed. Lasker -- Thomas game from 1912 that might have ended 18.O-O-O#. It did not, however. Lasker played 18.Kd2# (see "Chaos in a Miniature" by Edward Winter). Either way, the finish involved writing notation that you do not see every day.
A couple of weeks ago, I played a blitz game that ended Raxb5#. That's another notation that probably has no peer in the database.
This morning's bullet session featured a game that ended with checkmate via a discovered check by a piece that had not moved while a harassed king stepped further into apparent danger: Ke3#.
Here is that game.
Readers are encouraged to share their own moves with uncommon notation.