jbzdarkid
I tried a few alternative moves for white instead of Rxb7 but black always seemed to have alternative winning moves, because black starts a piece up so adding a piece for black...
Allows an unambiguous puzzle.
60th puzzle http://www.chess.com/tactics/server.html?id=400331
katonas, I know a nice tactic by White in Dvoretsky vs Bogomolov, Moscow, 1967, though I can't find the PGN anywhere. See if you can find it.
The tactic goes (as I remember), 1. Rxd7 Kxd7 2. Qa7 Qxa7(forced or loses the Queen) 3. Bb5#
StrategicPlay,
Try BookOpenings > Search games > Advanced options and enter the players names and the yr for the game and let me know the link. If you can't find it I wouldn't be able to find it either.
chapablanca, thankyou for submitting such a lovely tactic. Its amazing to see white's pieces hoovered up (see diagram). Unfortunately there are many winning alternative moves.
If you send me a link to a game it will save you typing out all the moves. Using an engine to check a puzzle will often enable you to add/remove a few pieces to eliminate alternative winning lines. You're a better tactician than I, perhaps you can see a way of removing some of the alternative winning moves.
Powerlevel_9001, you have indeed created a fiendish problem that would win many a difficulty prize. However :
Ideally I'm looking for puzzles where each best move is +2.5 better than the next best move. This makes it more likely that the problem is conclusive, with a gain at the end of the puzzle that is easily explained. I don't mind being a bit flexible on the 2.5, but tactics trainer users have come to expect a significant difference, and perhaps ought to be warned that they should also be looking for smaller gains. However I think tactics trainer should be more true to real chess, and have many problems with as little as +1 gain eg.winning a single pawn to go from -0.5 to +0.5. There are so many simple pawn winning tactics that you just don't see in tactics trainer yet these are some of the most common tactics we see in games. I believe an open discussion on this might help (in a separate thread), with chess.com members perhaps even asking to see more of such problems.
At the moment this problem would rise to over 3000 and not be seen by many which would be a great shame after all your hard work.
The first move is ideal for tactics trainer as it is the only way to save the game but 2.Nd7+ (+1.37) compared to 2.Nc6 (-0.10) isn't much of a difference.
Perhaps you could make some changes to get several short, probably still very challenging puzzles with greater gains over the next best moves.
katonas:
I got it from a player's post at chessgames.com.
Hi Katonas,
here's a few tactics. I've checked them with Houdini, hope they're OK.
White's 30th, http://www.chess.com/echess/game.html?id=29460748
Black's 15th, http://www.chess.com/echess/game.html?id=16869364
Black's 24th, http://www.chess.com/echess/game.html?id=29417982
Black's 34th, http://www.chess.com/echess/game.html?id=42089656
You may also want to conisider this game, http://www.chess.com/echess/game.html?id=25011688 from either move 50 or 52 for black. Not sure it's conclusive enough though.
Strategic play, I love the 2.Qh7 move!! wow. Unfortunately 1.Qf4 is as strong as 1.Rxd7. 2Qh7 has 2b4 (+8) as an alternative.
Because 2.Qh7 is the beautiful move, its nice to focus a puzzle around this move. The hardest move of a puzzle should be the first. Adding two knights for black removes some ambiguous lines and enables...
A little gem. Thankyou.
61st puzzle http://www.chess.com/tactics/server.html?id=201999
You're welcome, katonas.
Are we allowed to post tactics from our own games? I posted one in the group forums but I feel not more than 3-4 people saw it.
Should I post it in here?
Puzzles from your own games are preferred, but please exclude alternative winning lines first with an engine.
I have no idea how to insert your own games into Fritz 13..
katonas,
The new tactics trainer puzzle.. the one which I posted.. I saw that you gave it the tag 'Decoy / Deflection'. Maybe it should also have 'Mate in 2' and 'Queen Sacrifice'?
Powerlevel_9001 I'm still working on your puzzle but here is a gem that incorporates the great Qh1. I had to add a pawn on e7 to protect black's knight which if undefended creates a later ambiguous line.
62nd puzzle http://www.chess.com/tactics/server.html?id=283111
Strategic play - I didn't give it a label. I only tend to label the easy ones!
I've never used Fritz but if you try clicking on the little PGN box next to a game on chess.com, save it onto your hard drive and try opening it with Fritz.
edvinj, I haven't forgotten you, but I need a little time to do all that homework.
I'll try, katonas. Although I can't do it right now because it's installed on another computer. But I'll try to do it soon.
Who's edvinj?
Katonas; per my earlier submission: White's could play a move such Bxe3. After, there is only a single strongest move for black. Likewise for move 1. I'm confused as to where the ambiguity comes in.
jbzdarkid, 1...c5 and 1...Nd6 are just as good as 1...Ne3 so the puzzle can't begin.
I'm new to this, so please excuse my clumsiness. White plays 1. Ra3-Ra2.
Source game: Bouldoc-Chapa, Disneyland Open, Anaheim, CA 1983. 1. e4 c5 (1... d5 {[%emt 0:00:00]}) 2. Nf3 Nc6 3. d4
cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Bxf6 (9. Nd5 Be7)
9... gxf6 10. Nd5 f5 11. Bd3 Be6 12. Qh5 Bg7 13. O-O f4 14. c3 O-O 15. Rfd1 Ne7
16. Nxe7+ Qxe7 17. c4 b4 18. Nc2 a5 19. b3 Qd7 20. Qe2 Kh8 21. f3 Bf6 22. Qd2
Bd8 23. a3 Bb6+ 24. Kh1 bxa3 25. Rxa3 Rg8 26. Be2 Rad8 27. Ra2 Rxg2 28. Kxg2
Bh3+ 29. Kh1 Bg2+ 30. Kxg2 Rg8+ 31. Kh1 Qh3 0-1