his position comes from the game GM Gata Kamsky vs Joshua Jex from the simul that Gata did last Friday in Denver.  Thanks Josh for sending me this game!
 

   In the position on the right it is White to move.

 

   Answer below.

   This previous weekend was a big one for Colorado Chess!

   Super Grandmaster Gata Kamsky was in town!

   Some excerpts from an excellent report written by James "JC" MacNeil of the Denver Chess Club, which you can read here: https://www.denverchess.com/news/article/2046
 

Was this this the best Denver Open ever, or what?

Without past attendance records it is hard to know if our 132 player turnout was a record attendance, but it is certainly the best that I can remember.

I know for an absolute fact that this year's Open section had the highest average rating ever. The big news is GM Gata Kamsky, rated 2755 and currently #70 on the FIDE world rating list, played in this tournament. Without a doubt the highest rated player to ever play in a Denver Open.

GM Kamsky's participation prompted IM Justin Sarker, rated 2510, to fly in from New York at the last minute just to have the opportunity to play GM Kamsky. IM Sarkar has 3 GM norms but he has yet to reach a FIDE rating of 2500.

In addition to these two world class players, the Open section was chock-full of USCF National Masters. Our own NM Brian Wall, was the main force behind GM Kamsky's participation in this event. Actually, Gata called Brian out of the blue and asked if he could play in the Denver Open. From that moment on Brian did everything possible to make it happen, and happen it did. Brian has been like a little kid in a candy store for the last month :-)

To top it off for Brian, and despite the fact that he was not the highest rated of the National Masters, he tied for second with IM Sarkar. Congratulations Mr. Wall, and thanks for your efforts to make this Denver Open the best ever.

Of course GM Kamsky took first place, but not with a perfect score. IM Justin Sarker got his wish and was paired with the GM in the 4th round. I did not see the game, but from what I understand, Justin offered a draw from a position of strength.

   You can see the complete results of the tournament here: http://www.uschess.org/msa/XtblMain.php?201506147742

   The simul on Friday night was a lot of fun as well.  Gata played 22 boards, and won every game, except for draws against Jesse Cohen and Steve Kovach.  There were a lot of strong players in the simul, including several masters and experts.

   Gata also gave an interesting lecture on the London System, which is his main weapon as white.  

   Outstanding job by the Denver Chess Club for organizing these events, and thanks to Gata Kamsky for stopping by and being such a great ambassador of the chess world!


   Here is the complete game:

   Answer:
 
   There are often interesting tactics when two knights attack the same square.  One knight can sacrifice itself, so that the second knight can deliver the fatal blow.

   Here White played 22. Ncd5+ exd5 23. Nxd5+ forking the king and queen.  Starting with the other knight first works as well.
 

   Happy Tactics!

 

   Your Friend,

 

   P.S. I signed up yesterday for the 116th Annual U. S. Open Chess Championship!  It will be held August 1-9, in Phoenix, Arizona http://www.uschess.org/tournaments/2015/usopen/  I can't even imagine how hot it is going be there in August, but should be a blast!