@chamo2074 Na3 also seems to winning but Na7 is also a win imo.
If white play b5 knight protect pawn from an unattackable square.
If black plays b5, than white both have time for Kb2-a3, also because of na7-c6-b8-a6 possible maneuver, pawn can be defended without help of king.
Before the 15 Official Puzzle is posted, I would like to announce that @kJDG12 will be helping me with this forum thread more often. A lot of the puzzles I've seen before, or found myself to post here, but @kJDG12 also supplied me with a lot of good quality puzzles/compositions (In my "Official Solutions" you can always read the "hidden" white text below to see what my source is and this will reveal which puzzles @kJDG12 recommended I might use for this forum thread).
What they have that I do not is a list of many good puzzles to share and more free time than I have. For the last few puzzles I posted, @kJDG12 would send me several puzzles in messages [via pgn] and I would choose my favorites to share. Lots of the recent puzzles I literally just pull from my puzzle collection in my chess.com messages, but I think it makes more sense to streamline the process by going to the source 
For this reason, I offered @kJDG12 to co-host this thread with me. I hereby give them permission to also post "Official Solutions" if I am not around and so everyone might hear them giving more "clues" or "direction" on these future puzzles. Treat them as you would me, they were the source of many of the posted puzzles, so they know what they are talking about. 
As such, I may post some puzzles myself and I may also attempt solving with everyone else (for the ones that @kJDG12 wants to post without showing me the solution for).
In the meantime, I'll soon post a 15th Official Puzzle for everyone to begin working on
This is the 15th Official Puzzle for the Calculation Training forum. Black to move.
"The Brilliancy Prize" Game from Fischer's book: My 60 Memorable Games (which I just recently finished reading for the first time). The game is Robert Byrne vs Bobby Fischer U.S. Championship 1963/64, New York, NY, USA, rd. 3, December 18th, 0-1.
Good I like the idea
This is the 15th Official Puzzle for the Calculation Training forum. Black to move.
"The Brilliancy Prize" Game from Fischer's book: My 60 Memorable Games (which I just recently finished reading for the first time). The game is Robert Byrne vs Bobby Fischer U.S. Championship 1963/64, New York, NY, USA, rd. 3, December 18th, 0-1.
Yeah. I thought so
1....Nd3 2.Rf1 or whatever Nxf2 3.Rxf2 Nxe3 I forgot what white plays :/
1....Nd3 2.Rf1 or whatever Nxf2 3.Rxf2 Nxe3 I forgot what white plays :/
Good memory to a famous chess game, but forgetting what White plays is what calculation practice is for. Even Fischer (after going through many variations) said that the ...Nd3 move still wasn't clear right up until the point when White resigns!
Perhaps I shouldn't even give away this much, but the game (so far) continued:
14...Nd3! 15. Qc2 (since ...Ne4 was a threat) Nxf2! 16. Kxf2 Ng4+ and I'll let someone else "solve" the rest. It is critically important - otherwise the Knight sacrifice is unsound.
14...Nd3! 15. Qc2 (since ...Ne4 was a threat) Nxf2! 16. Kxf2 Ng4+ 17.Kg1 Nxe3 18.Qd2 Nxg2 19.Kxg2 d4 20.Nxd4 Bb7+21. Kg1 Qd7 is correct if I remember right
Well, that is quite the memory Yup that is correct I believe since that is what I recalled as well. Looks like we solved another puzzle - that was fast lol; didn't think someone would recognize the game so quickly but I suppose that is what I get for picking a famous chess game
I'll post the "official solution" in pgn and then move onto another puzzle soon.
Fsr I always remember that as the game of the century even tho its not, thats why i rememebr it so clearly
Fsr I always remember that as the game of the century even tho its not, thats why i rememebr it so clearly
Yes, congratulations on solving it @kracker12345 - This is actually one of my favorite games from the book (hence me posting it here).
Here is the 16th Official Puzzle; White to move.
Another puzzle sent to me via kJDG12
"wow", what? Regarding the 15th puzzle description, or the 16th puzzle? The 16th puzzle is an interesting one. I won't give it away, but I got about the first half of it, but then a certain move completely shocked me.
Good try @TumpaiTubo, but the solution is much longer than this.
Qh2+ ...Ka8 Qxf2? and Black plays b1=Q+! with Black checkmating White in one regardless where the White King flees!
Here is the 16th Official Puzzle; White to move.
Another puzzle sent to me via kJDG12
I would be surprised if this is more than the obvious perpetual check.
Whites manage to draw by Qh2+; Ka8; Qg2+; Kb8; Qh2+; Ka8 etc.
Congratulations ! You broke this very difficult puzzle ! xD
Of course Whites play and win. A nice study I discovered last week.
Na3 is better than Na7, and black should get his king closer because after b5+ right away white has no way to win this