Puzzles needed for tactics trainer

Does this approved?

Wow, katonas. You turned it into an entirely different thing.. 

nyLsel, your puzzles are quite good. They mostly deal with endgames with LOW material for either side but still a decisive result. 

theskyisblue808, http://www.chess.com/livechess/game.html?id=316024991 31.d6 is too easy a first move, and also has 31.a5 (+2.29) as an advantageous alternative.

Thankyou Spieler999 for two unambiguous lovely puzzles which needed no editing,

 86th puzzle http://www.chess.com/tactics/server.html?id=92622

Your sideline from one of my games is fascinating

87th puzzle http://www.chess.com/tactics/server.html?id=71317

Its ok to use bxa4? as a linking move to allow your 2nd and 3rd puzzles to be together.

Thankyou Justified08,

88th puzzle  http://www.chess.com/tactics/server.html?id=357263 

Thankyou nyLsel, 89th puzzle  http://www.chess.com/tactics/server.html?id=384175 

Gwilym puzzle 1 was ambiguous, however a sideline provided a puzzle

90th puzzle  http://www.chess.com/tactics/server.html?id=334349 

and 

91st puzzle  http://www.chess.com/tactics/server.html?id=442547 

Thankyou nyLysel, the g pawn can promote into a queen or bishop so unfortunately your last problem has to start later. You could always post the full puzzle in a comment under the TT puzzle.

92nd puzzle  http://www.chess.com/tactics/server.html?id=278281 

i want to give a couple of puzzles how can i  give them 

i mean do i need to give some coding. plz help he out

post on my WALL  

katonas, I want to thank you for all the hard work you put up for this to make TT better for all of us

Really, your effort is well appreciated!

Here's another fantastic tactic from one of my games (this is it for me, unless I compose or play more games here on chess.com =)

shoopi, you're welcome. Thankyou to you and all the other submitters for their submissions, and patience.

I had to alter puzzle one as Bg6, and Kh8 were alternatives to Bf5, which meant the puzzle had to start with the bolt out of the blue. I shall ask another approver what they think of the puzzle as it is quite complex.

I love the variation 93rd puzzle  http://www.chess.com/tactics/server.html?id=167253 

Oh I'm sorry katonas, many thanks for trying to fix it, but the white pawn is suppose to be on h5. My bad.

No problem, now there is a another problem (94th). 

http://www.chess.com/tactics/server.html?id=221411

http://www.chess.com/echess/game.html?id=55708544
Please take a look at move 7 for white. Seems it's a nice move :)

vipera, how much of an advantage does white gain after Be6 ? Please check any submissions with an engine.

Christian Soldier - you have given an example of the classic Greco sacrifice. Please exclude any alternative advantageous moves with an engine after 2...Kg6 which is usually the critical line in Greco sacrifices.

shoopi, a senior approver reviewed your last two problems. 

He felt puzzle 94, 

had a critical line which wasn't conclusive for a human 

4.Kd1!? (instead of 4.Qc4)

4...Qxb2 5.Rg3 Qb1+ 6.Ke2 Rb2+ 7.Ke3 Qd3+ 8.Kf4 Qxg1 9.Kxe4,

and now black is winning most convincingly with the crazy smashing calm move 9...c6!! (diagram below)

The edited version I attempted doesn't run into these problems as much (pure luck - certainly no skill on my part)

95th puzzle http://www.chess.com/tactics/server.html?id=415909

http://www.chess.com/tactics/server.html?id=221411

We've also shortened the alternative puzzle by one move to try to make it more conclusive for humans (no-one has solved it with a rating over 2800). I've re-set it to a slightly lower rating.

the game:

[Event "PMCA"]
[Site "?"]
[Date "2012.03.17"]
[Round "?"]
[White "Thomas, Guo"]
[Black "David, Peng"]
[Result "1-0"]
[ECO "D00"]
[PlyCount "73"]

1. d4 d5 2. g3 Nf6 3. Bg2 e6 4. Bf4 c5 5. dxc5 Bxc5 6. Nf3 Qb6 7. O-O Qxb2 8.
Nbd2 O-O 9. Nb3 Bb6 10. Qd3 Nc6 11. Bc1 Ne5 12. Bxb2 Nxd3 13. cxd3 Bd7 14. Rac1
Bc6 15. Ne5 Rac8 16. Nxc6 bxc6 17. Bd4 Nd7 18. Bxb6 axb6 19. f4 g6 20. e4 Ra8
21. Rxc6 Rxa2 22. exd5 exd5 23. Bxd5 Rb2 24. Rd6 Nc5 25. Nxc5 bxc5 26. Rc6 Rc2
27. Bc4 Rb8 28. Rf2 Rc1+ 29. Kg2 Kg7 30. Rxc5 Rbb1 31. Rc7 h5 32. Rxf7+ Kh6 33.
Re2 h4 34. Ree7 Rg1+ 35. Kh3 g5 36. Rf6+ Kh5 37. Bf7# 1-0

ChristianSoldier007, I can't find an unambiguous puzzle. 2...Kg6 3.Qd3 or Qc2  are mate in 5

Vipera, in view of black's Be6 defence, Bxf7+! is slightly stronger than Ne5. 

Katonas, I think here the best move for white Qb3

vipera, Qb3 is of course still advantageous for white, its just that a computer engine such as Houdini can look much further than we can. Please check any future submissions with an engine first, using the criteria set out at the start of this thread. 

Thanks for everything katonas.

Yes, indeed in my last two puzzles I tried to create highly challenging (sound) tactics, though I suppose they are not the best of my submissions as they really aren't that conclusive for humans (I consider prior ones to be superior).

"We've also shortened the alternative puzzle by one move to try to make it more conclusive for humans (no-one has solved it with a rating over 2800)" - hah, that's impressive! as the first move is the only way to gain advantage. So it is a tactic which is too hard!

In my future submissions, I will try to avoid creating fiendlishly difficult tactics in favour of shorter, one-dimensional tactics leading to a clear advantage. I'll keep that in mind

Here is a puzzle that is instructive:

I used a chess engine and the 2 moves Qb2 and Qxc1 are forced or else white gains an overwhelming advantage.

NajdorfDefense unfortunately the hypermodern puzzle has numerous winning alternative lines.

Thankyou thomas0115 96th puzzle  http://www.chess.com/tactics/server.html?id=308285

Thankyou nick4567, 97th puzzle http://www.chess.com/tactics/server.html?id=376139