Upgrade to Chess.com Premium!

Puzzles needed for tactics trainer


  • 3 years ago · Quote · #121

    MoonlessNight

    this is what my engine (scid) is saying:



  • 3 years ago · Quote · #122

    EndgameStudent

    nate23, scid is correctly identifying there are other winning moves eg.12...Bd2+ (-11.82) and 12...Bf4 (-10.10). 12...Bd2+ would only be accepted if all other moves were no better than -1. Perhaps you thought Bf4 would be accepted if its evaluation were no better than -10.82? The important thing to remember is that each move in the puzzle should be the only way to win. Imagine how you would feel if you were playing tactics trainer and chose 12...Bf4 only to be told you were wrong and lose 16 points. piphilologist had a nice idea to save the puzzle by removing the black queen but 12...Bd2 is still not +2.5 greater than the next best move 12...Bf4 

  • 3 years ago · Quote · #123

    piphilologist

    How about removing the white f-pawn and the black queen so then only Bd2 wins the queen.

    (i know this is going to end up nothing like the original puzzle lol)

  • 3 years ago · Quote · #124

    piphilologist

    katonas wrote:

    Please add your puzzle to this forum topic if :

    Each best move is at least +2.5 better than the next best move with the next best move having a value of less than +0.3-1.0 (higher end of this range ok if the main move is very strong)

    Examples not allowed :

    solution move forced mate, next best move mate in more moves

    solution move forced mate, next best move greater than +1.0

    So at each step the solution move must be the only winning move (otherwise the problem is 'ambiguous'), or only move to prevent a loss (for example perpetual check or stalemate)

    Just wondering if you can edit tactics. just did Tactic# 21279 where the final move a lot of people including me failed because there are several easily winning options on the final move. I know its not the point of this thread but if possible could you could you cut the final move off?

  • 3 years ago · Quote · #125

    MoonlessNight

    Oops! I thought that the best move had to be 1.5 points ahead of the next best move. We were both looking at the same evaluations, but coming away with different ideas. I will make sure that my next tactics fit criteria. thanks for doing this!

  • 3 years ago · Quote · #126

    theweaponking

  • 3 years ago · Quote · #127

    theweaponking

    That first one up there is an original composition.  This one is a modified position in the end of one of my games where Black wins major material.

    To start the puzzle, White first plays 1. Rg1??, and the person goes from there.

     

  • 3 years ago · Quote · #128

    theweaponking

    OKAY - Both of the puzzles I posted are now valid.

  • 3 years ago · Quote · #129

    Markus24

    @theweaponking: Wouldn't 2.Re7 win much faster? (First puzzle)

    Anyway, one from one of my games:

  • 3 years ago · Quote · #130

    theweaponking

    Hey, Markus.  2. Re7?? seems like it wins faster, but it seems to run into a cute counterstrike.



  • 3 years ago · Quote · #131

    EndgameStudent

    Markus24, I'll be able to look at your puzzle properly in a few hours. What was white's move before the problem started ? New tactics trainer puzzles must start with the computer moving first.

    nate23, perhaps you could test piphilologist's further idea for using your puzzle.

  • 3 years ago · Quote · #132

    samthechelseafcfan

    Hope this puzzle satisfies the requirements for this thread. My sincere apologies if it does not.

  • 3 years ago · Quote · #133

    EndgameStudent

    Unfortunately in puzzle1 weaponking after 2…Kc8 3Re8 (mate in 5) or 3Qa7 (+6) or Re8+ (+5) so there are 3 ways to win and the problem cannot continue. However Markus24’s suggestion has led to a puzzle :
    Adding a b pawn for white makes 3…Qf4 the only strong move, and I’ll ask CM Ilmago whether he thinks the problem can be allowed to continue with this move as we usually try to avoid having the most difficult moves at the end of the puzzle as it results in a very low pass rate.
     
    When giving the first move for puzzle2 1.Rg1 I need to know the starting square for the rook. I chose 1.Rh1-g1 as this seemed likely. Unfortunately puzzle 2 is ambiguous. 1…Qf3 (+18) and 3….Rxb1+ (+8) and 4….Rxd1+ (+21) is just as strong as 4…Bxd2 and 4…Rf2 (mate in 7) is even stronger. There can only be one winning move at each step of the puzzle.
     
    Markus24 unfortunately 1…g6 and 1…Nxc2 are also winning. Please use an engine to exclude alternative winning lines.
     
    samthechelseafcfan unfortunately there are many ways to mate in 2 or or more moves so the problem is ambiguous. There must be only 1 way to win for the puzzle to be eligible. 
     
  • 3 years ago · Quote · #134

    msjenned

  • 3 years ago · Quote · #135

    EndgameStudent

    msjenned please ensure there are no alternative winning lines in your puzzles with an engine, such as 1...Rf2+ (+14) instead of 1...Qh3+ (mate in 7)

  • 3 years ago · Quote · #136

    shoopi

    Looks like you need more puzzles!

    Here's a brilliant mate in 9 from one of my Marshall Attack games (altered). I have also included variations I find worth adding.

  • 3 years ago · Quote · #137

    EndgameStudent

    shoopi that's a stunning problem. Thankyou so much for posting a perfect diagram that enabled me to effortlessly copy and paste the whole FEN into the analysis and source of

    27th puzzle http://www.chess.com/tactics/server.html?id=412215

    sidelines

    31st puzzle http://www.chess.com/tactics/server.html?id=272083

    30th puzzle http://www.chess.com/tactics/server.html?id=202027 

    29th puzzle http://www.chess.com/tactics/server.html?id=241405 

    28th puzzle http://www.chess.com/tactics/server.html?id=464359 

    The potential repetition near the end doesn't make the problem ambiguous because the same mating sequence has to be used to win.

  • 3 years ago · Quote · #138

    shoopi

    Nice variations there.

    Indeed, this tactic has high emphasis on square weakness, especially when both sides have bishops of opposite color. It is a useful attacking theme.

    Looking forward to submitting more puzzles.

  • 3 years ago · Quote · #139

    msjenned

    katonas wrote:

    msjenned please ensure there are no alternative winning lines in your puzzles with an engine, such as 1...Rf2+ (+14) instead of 1...Qh3+ (mate in 7)

    between a Rf2 or a mating net w/ Qh3, which is required for a Tactic? Rf2?? You've many other Tactics that had another line but TT picks up best option.

  • 3 years ago · Quote · #140

    shoopi

    Such tactics are NOT ok as far as I understand, and as katonas has said on the first page - "We're gradually deleting ambiguous problems...".


Back to Top

Post your reply: