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Alexander Moiseenko vs Vladimir Potkin
European Championship (2003), Silivri TUR, rd 2, May-31
Semi-Slav Defense: Stoltz Variation. Shabalov Attack (D45)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
Dec-16-05  LIFE Master AJ: I got as far as 26.Ba6 ... and gave up! (Missing the idea of ...Bc6!; exploiting the fact that both sides are plagued by back-rank weaknesses.)
Dec-16-05  NakoSonorense: AJ, do you have any good puzzles from the games that you've played?
Dec-16-05  taerone: Nice puzzle. I calculated this up to 21. ..., Rc1+, but it turns out there was still some fight for white.
Dec-16-05  Snow Man: Upon seeing the puzzle I thought, "Self, the white king is exposed to check by the rook." Then self said, "the black queen is en prise." These two ideas wrestled with eachother for a minute or so but after the dust settled we agreed to push the white king into the corner and stopped thinking...
Dec-16-05  YouRang: <Snow Man> LOL - That's how lots of us too often play chess. And yet sometimes, as in this case, you would have stumbled into a good combination if you later realized ...Rc1+!, and perhaps again with ...Bc6!. Talent, or luck? :)
Dec-16-05  chessic eric: <<aginis>: i think you have to see at least to 26...Bc6 to really have solved the puzzle...Seeing in advance that the rook wont be able to take the interposing bishop is what makes this a wining combo...> Seeing that far is what makes it the best continuation after black's forcing combinative play.

<<nuwanda>: <aginis>: i don't see why after 23.Rgd1 the black moves are forced. What about e.g. 23... Qb4 24. Rd7 Rb8 25. Nd4 e5 26. a3 Qd2 27. Nb3 Qf2 or 24. Be2 Rb8 I think Black is clearly better and there is no danger of loosing the Queen.>

<Nuwanda> you are right that black is better than white in your continuation, but black is worse there than in the text continuation, and I think aginis's good point is that black's moves are forced since he took the tempo to further his material advantage with 24...Bxf3 rather than create luft or something similarly conservative. It was that move in conjunction with the clever 26...Bc6 that really put the nail in the coffin. The fact that 24...Bxf3 is only possible on 23...Qb6 and not 23...Qb4 is the reason to play the former.

Dec-16-05  chessic eric: <patzer2>,<YouRang> Aren't 19...Rac8+ and 20...Be4+ simply forcing moves that set up 21...Rc1+ since neither of these deflects the guard of the combinative target (Q@d6)? It is quite possible I'm confused about the technical use of these terms, having read only Dvoretsky's book on combinative calculations, and not a book on thematic descriptions of the fucntion of categories of moves (i.e. deflection, remove the guard, etc).

I think 21...Rc1+ is a decoy, since if it were possible to be "deflected" anywhere else it would remain on the d-file guarding the d6 Q. I do think the distinction between decoy and deflection is a very fluid one, but it does have explanatory value in alot of cases, especially in combinations (unlike this one) where the guarding piece must be brought to a particular square (decoy/come right here), rather than simply dislodged (deflection/go away but I don't care where).

Dec-16-05  HoopDreams: well its not exactly a decoy...because the move is forced. When the other guy plays RxC1 its an obviously forced move, he is just being forced to remove his defender of his queen. Decoy -To lure or entrap by or as if by a decoy. You are not luring his rook, but forcefully making it go away
Dec-16-05  misguidedaggression: Is there anything wrong with 23...Qe7

For example: 24.Rc7 Nf8 (or maybe Nb6) threatening Rxd1# and Qxc7

Dec-16-05  Eatman: I do wonder how many of the solvers for today saw Bc6!, I freely admit that I saw Rc1+ and said to myself "oh easy win for black" and stopped calculating after 30 secs. Should have spent some more time on this. I imagine Moiseenko saw the Rc1 in advance but thought he was winning the queen back.
Dec-16-05
Premium Chessgames Member
  benveniste: 23... ♕e7 seems to hold the advantage. That doesn't negate the brilliance of 26. ... ♗c6, which I didn't see at all.

Great puzzle!

Dec-16-05  YouRang: <chessic eric: <patzer2>,<YouRang> Aren't 19...Rac8+ and 20...Be4+ simply forcing moves that set up 21...Rc1+> I don't have a problem calling 20...Be4+ a deflection, since it makes the king "go away" from its defense of the c1 square, allowing 21...Rc1+. <I think 21...Rc1+ is a decoy, since if it were possible to be "deflected" anywhere else it would remain on the d-file guarding the d6 Q.>

This is my understanding of the difference: A deflection forces a piece AWAY from its position, such that it no longer serves some purpose that it held there.

A decoy forces a piece to move INTO a position, such that it serves the purposes of the opponent (usually a tactic, such as a pin or fork, etc.).

In this case, 21...Rc1+ had the effect of taking the d1 rook AWAY from its defense of the queen on the d file.

We forced it to go the c file, but it would have been just as effective had we forced it to (say) the b file. There was nothing special about making it go to c1. There WAS something special about making it leave d.

Dec-16-05
Premium Chessgames Member
  OhioChessFan: I thought getting up to Black's 22nd move was sufficient. That much was easier than normal for a Friday. I do see the need to get all the way up to 26 Bc6.
Dec-16-05  Frankly: Best thing about this puzzle was the need to carry on after winning the queen. I bet very, very few bothered to do so, and almost nobody would have gone so far in a game as to see how necessary it was to play very carefully for Black to avoid losing. Hence, also, the imperative for White to continue playing. It is anything but rude to decline to resign when your opponent needs to play very carefully to avoid losing! I suppose I'd better add that I did not go all the way here.
Dec-16-05  TTLump: <nuwanda: aginis: i don't see why after 23.Rgd1 the black moves are forced. What about e.g. 23... Qb4 24. Rd7 Rb8 25. Nd4 e5 26. a3 Qd2 27. Nb3 Qf2 or 24. Be2 Rb8 I think Black is clearly better and there is no danger of loosing the Queen.... [chessic eric] you are right that black is better than white in your continuation ...>

I respectfully disagree, I don't think Black is better than white after 23... Qb4, 24.Rd7 Rb8, 25.Nd4 e5, 26.a3 Qd2 27.Ne2! (NOT Nb3?) Qa5, 28.Bc4 Bg6, 29.Rcd1, and from this position, White is winning!

Dec-16-05  TTLump: <belka> the point Aginis was trying to make and I agree with him, is that without 26.... Bc6, black loses, rendering the initial three-move sequence by itself merely a lucky/educated guess rather than a brilliant combination.
Dec-16-05  Toporagno: Does anybody see if there's something wrong with 23. ...Qe7?
Dec-16-05  YouRang: <Toporagno: Does anybody see if there's something wrong with 23. ...Qe7?>

Well, I spent some time looking at it, and I thought it was a solid move. And, by my reckoning at least, it was the more intuitive move. (For this reason, I disagree with those who say we had to calculate through 26...Bc6 to get credit for solving the puzzle -- that line wasn't forced.)

The chosen line 23...Qb6 does seems to reduce the material more rapidly, perhaps prompting an earlier resignation, but it is also more risky. If you opt to play 23...Qb6, you SHOULD first calculate at least as far as 26...Bc6.

Dec-16-05  JohnBoy: This is a super puzzle - I totally missed 26...Bc6, which makes the whole thing work. I was convinced that black had to give the queen back...
Dec-16-05  misguidedaggression: <If you opt to play 23...Qb6, you SHOULD first calculate at least as far as 26...Bc6.> But, you can do that on the 23rd move, you really shouldn't need to see that on move 19. And if worse comes to worse, you just give the queen back and play a pawn down. I have found that usually in superior positions like this one, you don't have to find the brilliant move. It will just be there after the smoke clears, waiting to be played.
Dec-16-05  patzer2: <chessic eric> <Aren't 19...Rac8+ and 20...Be4+ simply forcing moves that set up 21...Rc1+ since neither of these deflects the guard of the combinative target (Q@d6)?> Actually, the King on b1 guards and prevents the Rook check on c1 from deflecting/decoying the defending Rook on d1. So both 19...Rac8+! and 20...Be4+! are deflections.

To put it another way, Black must first force the White King to give up it's guard of the c1 square in order to play 21...Rc1+! to force the defending Rook off the d1 square.

<YouRang> Perhaps you're correct that 21...Rc1+ is actually a third deflection (i.e. removing the guard). Yet the definition of decoy and deflection at http://www.angelfire.com/games5/che... could support either use of the term. I guess the question is does 21...Rc1+! win by forcing the guarding White Rook to c1 or away from d1? My answer is both.

Dec-16-05  patzer2: http://www.angelfire.com/games5/che... is a source for National Master Pete Prochaska's definitions at Chess Oddessy for the terms decoy and deflection.
Dec-17-05  YouRang: <misguidedaggression> If I'm not mistaken, I believe you are restating the point I was trying to make: At move 19, it isn't necessary to calculate forward to 26...Bc6. It does become necessary at move 23 if you are considering 23...Qb4.
Jan-03-06  HoopDreams: i guess the chess definition of decoy is different than the english language definition...
May-01-09  I Like Fish: a grrreat win...
forrr forrrmerrr...
rrrussian prrrezident...
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