Puzzles needed for tactics trainer

http://www.chess.com/echess/game.html?id=55545956

http://www.chess.com/echess/game.html?id=55545952

a blunder by black , its a trick one because diagonal retreats are hard to see for humans

http://www.chess.com/echess/game.html?id=53964268

this one is a nice knight fork it has a few variants but they are all the same. black wins a piece or material.

I made something like this for the en passant poll.  Some people don't know the rule, and some people seem to think it doesn't work if that pawn checks the king.  For people who don't know the en passant rule, they'd think you have to capture with the rook, but with it one can save the rook and possibly win the game.  It'd be good for a low level puzzle.  I'm not sure about the king's move, someone far more advanced might see something better than 2. Kf5.  Of course, white's first move isn't tactically sound, but, at my level, people do stuff like this without considering ep.

TonyH, thankyou , 98th puzzle http://www.chess.com/tactics/server.html?id=425833

Thankyou for starting the second diagram with a computer move. Unfortunately the problem is ambiguous with Qd4 also winning. 

99th puzzle http://www.chess.com/tactics/server.html?id=297857

ClavierCavalier, thankyou for the 100th puzzle (moves altered slightly to prevent ambiguity)

(http://www.chess.com/tactics/server.html?id=420183

@ everling you should add a few more pieces, because the way you have it makes it way to obvious.

Oh man, I meant to include a black bishop on f8 so the pawn would be protected and it'd be roughly even material.  It's still a nice little en passant thing, even though black will probably lose. If it's not too late to change it:

http://www.chess.com/livechess/game.html?id=331014670

seems a nice mate in 3 at the end

NajdorfDefense, as explained several times already in this thread, I’m looking for beautiful, instructive, highly unambiguous puzzles. I’ve not started the thread to discuss existing TT problems, and I have written my personal requirements for puzzles in the first post.

ChristianSoldier, unfortunately there are alternative winning lines throughout the puzzle. It is however, a nice mate that I enjoyed working through.

Everling10, unfortunately there are already many puzzles using this classical sequence  in TT, so although it is unambiguous I’ve not added it, to avoid further duplication. As nate23 said, it is also a little artificial without more pieces. 

ClavierCavalier, alterations made. Interestingly even without the bishop Houdini gave black a slight advantage. 

nick4567, well done for recognizing the absence of alternative winning lines. Unfortunately I'm also looking for puzzles where the difference between the best and second best move at each step is ideally at least 2.5. White can also maintain equality with a different last move :

I hoped there would be a puzzle from the line if white tries to save his knight, but unfortunately there are many advantageous alternative moves.

Thankyou Metaknight251, I’ve chosen a different contination requiring a ‘look before you leap’ approach for black. 101st puzzle http://www.chess.com/tactics/server.html?id=417603

Thankyou vipera_raddei, I added an extra rook to remove alternative winning lines. 

102nd puzzle http://www.chess.com/tactics/server.html?id=457427

Asorski, black to move : c1=Q (-10) or Kc3 (-1.75) provide two advantageous lines. 

• http://live.chess.com/live?v=20120709#
• Move 24 begin

I was looking at my revised puzzle just now.  I just have to say I love the sounds!  When playing the right moves with the arrow buttons, it has a musical quality when clicked through at a steady tempo (like around MM 112).

Here is a composition of mine.

  Its quite complicated and has lots of varaitions (however, its black that makes the choices). Hopefully its instructive.

I have checked with engines in the past, but not specifically for the criteria of this thread :)

@Metaknight251

Did you mean 3.Bxg7+ Kxg7 Rax7+ Kxa7 g6.... ?

if so, you are spot on, I checked and this works. Moreover it is arguably thematically better since the king ends up further away from the pawns!

This problem can be fixed by changing blacks response to Nxa7:

I dont like this line as much since I dont think it is as pretty. But nonetheless, the puzzle is more or less the same.

Hi Katanos

thanks for using the game, just want to know why the previous move Rcd8+ is not involved as puzzle move ?
102nd puzzle http://www.chess.com/tactics/server.html?id=457427

thanks again

artem

Hi all
Please take a look to this game 15 move for white  .
http://www.chess.com/echess/game.html?id=53165460 

Thanks 

My apolygies, there will be a delay before I can work on your submissions. I'll edit this post when normal services resume