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Evgeni Vasiukov vs Yrjo A Rantanen
GMA World Cup Open (1988), Belgrade YUG, Dec-??
Spanish Game: Morphy Defense. Archangelsk Variation (C78)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Given 22 times; par: 39 [what's this?]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Dec-10-07
Premium Chessgames Member
  kevin86: The brilliant twin sacrifices set this one up! A good one!
Dec-10-07
Premium Chessgames Member
  patzer2: For yesterday's extremely difficult Sunday puzzle, White plays the demolition of pawn structure combination 26. Nxf7!! Playing over this complex variation with the help of a computer might prove helpful.
Dec-10-07  alphee: Insane? May be. I saw the 26.♘xf7 ♖xf7 sequence with some possible following moves but ♖xc5 looked as a mandatory step to eliminate the ♔night and possibly allow ♗c3 at a latter satge. In fact I could not link the two and went to the solution from wich I was very far. I wonder how many people did find the full sequence.
Dec-10-07  zb2cr: alphee>,

I may have come the closest to the game continuation. Many posters opted for 26. Rxc5, which may transpose to the actual game. At least 4 others saw the basic ideas of the initial 2 moves, but were unable to find the correct follow-up.

Since this is the very first Sunday puzzle I have ever solved, I'm inclined to attribute it to dumb luck on my part.

Dec-11-07  alphee: <zb2cr> thanks for the posting. Luck is something very strange. Gary Player, a famous South African golfer, used to say "the more I train the luckyiest I become". I expect you accumulated a lot of training and this site is one of the best place for it ... in my view at least.
Aug-29-21  Brenin: Ah, a "new" POTD, after brief appearance by a familiar-looking N Davies vs Gavin Crawley from a week ago. This game was analysed in great detail as a POTD nearly 14 years ago. I went for 27 Rxc5, expecting 27 ... Qxc5 28 Rc1 Qb6 29 Bb3, whereas the game line 27 ... Bxc5 seems to leave Black's K-side dangerously undefended.
Aug-29-21  mel gibson: I didn't get this one.

Stockfish 14 agrees with the text:

27.Rxc5

(27. Rxc5 (♖c1xc5 ♗f8xc5 ♕h5-g6 ♖e8-e7 ♗a4-b3 ♔g8-f8 ♕g6-h7 ♔f8-e8 ♕h7-g8+ ♖f7-f8 ♘f5xg7+ ♖e7xg7 ♕g8xg7 ♔e8-d8 ♖a1-c1 ♕b6-c7 ♕g7xc7+ ♔d8xc7 ♖c1xc5 ♔c7-b6 ♖c5-c1 ♖f8-f6 ♔g1-f1 ♗b7-a6 ♔f1-e2 ♖f6-g6 g2-g3 ♖g6-f6 ♗b3-d5 ♘c6-e7 ♗d5-a2 ♘e7-c6 f2-f3 ♖f6-g6 ♗a2-f7 ♖g6-f6 ♗f7-d5 ♘c6-e7 ♗d5-c4 ♘e7-c6 ♗c4xa6 ♔b6xa6 ♖c1-c5 ♔a6-b6 ♖c5-d5 ♖f6-f8 f3-f4 e5xf4 ♗d2xf4 ♖f8-a8 ♔e2-d2) +5.85/40 952)

score for White +5.85 depth 40.

Aug-29-21  goodevans: Didn't get it and it's not clear to me why White needs to sac the exchange before playing Qg6.

Looking back over three pages of posts I find two things from 2007: (1) <RandomVisitor> said that <37.Qg6> was also winning but didn't provide much detail to back that up; and (2) I've failed to solve this puzzle before!

Aug-29-21
Premium Chessgames Member
  agb2002: White has a pawn for a knight.

Black threatens Nxa4 and Nxd3.

The black queen and rooks are defenseless (the one on f7 is attacked and defended once). These details suggest 27.Qg6, combined with Rxc5 to enable b3 for the light square bishop, 27... Rfe7 (27... Nd8 28.Qxb6; 27... Nxa4 28.Nxh6+ Kh8 29.Nxf7+ Kg8 30.Ng5) 28.Rxc5 Qxc5 29.Bb3+ Kh8 (29... Re6 30.Qxe8) 30.Nxh6:

A) 30... gxh6 31.Qg8#.

B) 30... Na5 31.Nf7+ Rxf7 (31... Kg8 32.Ng5 followed by Qh7#) 32.Qh5+ Kg8 33.Bxf7#.

C) 30... Nd8 31.Nf5 Re8 32.Qh5+ Kg8 (32... Rh6 33.Bxh6) 33.Qxe8 looks winning.

Aug-29-21
Premium Chessgames Member
  agb2002: I saw 30... Rxf5 31.exf5 (far better than Qxe8, White now has f6 combined with Bxh6) but forgot to analyze a bit deeper and include as line D.
Aug-29-21
Premium Chessgames Member
  Teyss: Was also a Sunday puzzle in 2007 but interestingly starting a move earlier. Some key findings from previous kibitzes mixed with mine (and I confess SF, this is Sunday):

26.Rxc5 before Nxf7 allows 26...hxg5 providing a smaller advantage than the game line meaning White was right to play this.

Big debate about 27...Bxc5 vs 27...Qxc5. SF give the former as better but actually both lose: 27...Bxc5 removes a g7 defender allowing the game line, 27...Qxc5 gives up control of g6 after Nd8 allowing 28.Bb3 followed by 29.Qg6.

In the end 32...Kxe7 loses the R after 33...Ke6 34.Bb3+. 32...Rxe7 would have been slightly better but sill loses after 33.Bg5: there are many variations around Bb3, Qxg7, Rc1 etc. mainly resulting in R+3Ps vs 2 minor pieces for White with threats on the BK or promoting the hP.

Aug-29-21
Premium Chessgames Member
  agb2002: After a few minutes running, DroidFish evaluates Rxc5 and Qg6 as roughly equivalent, at about 3.6. However, Qg6 looks to me easier (more dominating).
Aug-29-21
Premium Chessgames Member
  Teyss: <goodevans: Didn't get it and it's not clear to me why White needs to sac the exchange before playing Qg6.> To allow 28.Bb3 pinning the R in case of 27...Qxc5. Black then has to choose between two evils 27...Qxc5 and 27...Bxc5 as noted. Bb3 will also come in handy at the end of the combination.
If 27.Qg6 Rxf5 and White has a small advantage but the position is very complex e.g. 27.Qxe8 Rf6 protects g6 and h6 or 27.exf5 Ra8 removing the R and attacking the Ba4.
Aug-29-21
Premium Chessgames Member
  Teyss: <agb2002: After a few minutes running, DroidFish evaluates Rxc5 and Qg6 as roughly equivalent, at about 3.6. However, Qg6 looks to me easier (more dominating).> Interesting, question of style probably. I would feel more confortable with Rxc5 removing a defender, simplifying a bit and allowing the Bb3 option.
Anyhow I would never have reached such a position and even if I had, wouldn't have found the right continuation after Rxc5 nor Qg6.
Aug-29-21  mel gibson: Some people are asking about 27. Qg6 ?
Yes it is almost just as good as the best move:
27. Rxc5 score for White +5.85 depth 40.

So - a valid solution.

Stockfish 14 says:

27.Qg6

(27. Qg6 Rxf5 (♖f7xf5 e4xf5 ♖e8-a8 f5-f6 ♘c5xa4 ♖a1xa4 ♕b6-c7 ♖a4xa8 ♗b7xa8 ♗d2xh6 ♕c7-f7 f6xg7 ♗f8xg7 ♕g6-g4 ♔g8-h8 ♗h6xg7+ ♕f7xg7 ♕g4-c8+ ♕g7-g8 ♕c8-f5 ♕g8-h7 ♕f5-f8+ ♕h7-g8 ♕f8-d6 ♔h8-h7 ♕d6-d7+ ♕g8-g7 ♕d7-f5+ ♕g7-g6 ♕f5-c8 ♕g6-g8 ♕c8-h3+ ♔h7-g6 ♕h3-d7 ♕g8-f7 ♖c1xc6+ ♗a8xc6 ♕d7xc6+ ♔g6-g7 ♕c6-c5 ♕f7-f5 ♕c5-c7+ ♔g7-g8 ♕c7-b8+ ♔g8-h7 ♕b8-b7+ ♔h7-h6 ♕b7-c6+ ♔h6-g7 ♕c6-e4 ♕f5-g5 f2-f4 e5xf4 ♕e4xd4+ ♔g7-g8 ♕d4xb4 f4-f3 ♕b4-b8+ ♔g8-f7) -5.03/39 368)

score for Black -5.03 depth 39.

Aug-29-21
Premium Chessgames Member
  chrisowen: Jumpiness i ooh Rxc5 fragile against abbott i ooh an its i valve on back horse c5 on dj i ooh highlight ribs atchoo jumpiness i ooh taj pixels poxy whisk binner winner ie ooh cranberry against quagmire i ooh its vagrant jedi duo flood its trash whickers i ooh flipped its yoga i ooh nope puzzle i ooh joke its v Rxc5 jastha creaks 2 3 fee its calm dessicate i ooh oar joy rec on wish right now i ooh far raffle addups flubber about i ooh lo at flusher a hog up dines its pothole z its whick joke its valiant dna its very ar nail in the coffin Rxc5 oedipus?
Aug-29-21
Premium Chessgames Member
  chrisowen: Peace offering rook a bridge no x
Aug-29-21
Premium Chessgames Member
  chrisowen: Chess eg bicker no? That counts for nothing :)
Aug-29-21
Premium Chessgames Member
  chrisowen: Chew on this a deaf doggerel oof no?
Aug-29-21
Premium Chessgames Member
  chrisowen: Changed its no doubt :) x
Aug-29-21
Premium Chessgames Member
  Who is me: bad week 4 me ! 4 loss 3 win
: - (
STILL FUN !
Aug-29-21  offramp: A toughie. This is one of those hard combinations that cover the entire board.
Aug-29-21
Premium Chessgames Member
  agb2002: <Teyss:... wouldn't have found the right continuation after Rxc5 nor Qg6.>

I had similar impressions with difficult positions the first time I read Kotov's "Think Like a Grandmaster", over forty years ago but started changing my mind the second time, one or two years later.

My opinion is that one only needs energy and concentration to be able to calculate any number of legal moves.

However, in order to calculate with a reasonable degree of precision, one needs to add intuition, tactical knowledge, technical knowledge (for example, theoretical endgames) and be able to operate using some 'base' positions from which to resume the calculations if one thinks the last chosen path is wrong or unclear.

For example, the position after Black's sixth move in the study on your page is one of such positions: I went back to it several times, after discarding 7.Qxa1 (stalemate), 7.Bxa1 (black king position is unassailable) and 7.Qh2+ (the white queen can't aim at c8 and prevent checks at the same time). Only then I started considering a queen move along the eigth rank but suddenly my wife came with a more mundane task (anyway, I enjoyed the study a lot, thank you!).

Aug-29-21
Premium Chessgames Member
  Teyss: <agb2002> Many thanks for you enriching comments. Fully agree with you even though we don't play in the same category (I mean it, not humblebragging here). So my energy and concentration, as you put it, is hindered by lack of intuition, tactical knowledge and technical knowledge, which you so rightfully identified. Trying to improve but it's taking time.

Glad you enjoyed the study! And actually solved it (we'll disregard external elements interrupting the correct path ;-). Take care, que lo pases bien.

Aug-29-21  WaxTadpole: Unless you tell me "there's a combination here", I'm likely moving my rook to f1 to prepare f4. Even after you tell me that, there's no world where I consider that knight, or it's recapture, worthy of the starting point of a combination. (In my flawed estimation), it's not doing anything important, and while gaining b3 for the bishop is nice, I don't see how that makes the magic happen.

These guys are good.

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