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Nikita Vitiugov vs Sergej Dyachkov
Russian Team Championship (2008), Dagomys RUS, rd 7, Apr-09
French Defense: Winawer. Classical Variation (C18)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Sep-01-21  mel gibson: It took me one minute to see all that -
there were so many lines to investigate.

Stockfish 14 says mate in 6:

25. Rxd7+

(25.
Rxd7+ (♖e7xd7+ ♗c8xd7 ♕d6-b6+ ♔d8-e8 ♖c1-e1+ ♗d7-e6 ♕b6xe6+ ♔e8-d8 ♕e6-d6+ ♔d8-c8 ♘f5-e7+) +M6/78 13)

Sep-01-21  mel gibson: There is also a mate in 8.

Stockfish 14 says:

25. Ng7

(25.Ng7 Rxg7 (♖g8xg7 ♖e7xg7 ♕g6xg7 ♗h6xg7 ♔d8-e8 ♖c1-e1+ ♔e8-f7 ♖e1-e7+ ♔f7-g6 ♕d6-g3+ ♔g6-h5 ♕g3-h3+ ♔h5-g5 ♗g7-h6+ ♔g5-g6 ♖e7-g7+) -M8/60 10)

Sep-01-21  BxChess: I thought 25. Ng7, with the threat of 26. Ne6#. It also seems to win, but more slowly.
Sep-01-21
Premium Chessgames Member
  Gregor Samsa Mendel: I also saw 25 Ng7 but not 25 Rxd7+. The Computer says that black can delay mate but loses the queen after 25..f5. Apparently 25 Bg7 is also winning.
Sep-01-21
Premium Chessgames Member
  al wazir: My move was 25. Ng7 and I'm sticking with it:

25...Rxg7 (25...Qxh6 27. Ne6#) 26. Bxg7.

A) 26...Qg5 27. R1e1 Qg6 28. Bxf6 Qxf6 29. Re8#.

B) 26...Qf5 27. Bxf6 Qxf6 28. Rxd7+.

C) 26...f5 27. Bf6.

Sep-01-21  Cheapo by the Dozen: It took me a while to try the most forcing line, namely the game move of 25 Rxd7+. So as soon as I found the also crushing lines with 26 Qe7+, I stopped and declared success, rather than going on to find the superior game alternative. ;)
Sep-01-21
Premium Chessgames Member
  agb2002: White is one pawn down.

Black threatens Qxg2# and Qxf5.

The black knight controls b6. This suggests 25.Rxd7+ Bxd7 (25... Ke8 26.Qe7#) 26.Qb6+:

A) 26... Kc8 27.Nd6+ (far quicker than 27.Ne7+) 27... Kb8 28.Qxb7#.

B) 26... Ke8 27.Re1+ Be6 (27.... Kf7 28.Re7#) 28.Qxe6+ Kd8 29.Qd6+ Kc8 30.Ne7#.

Sep-01-21  Brenin: 14 ... Nd7, protecting the P on c5 but blocking the LSB from protecting the P on e6, looks like a mistake. Black is 2P ahead, and can afford to give one back by playing 14 ... Nc6, attacking both of White's central Ps and leaving e6 better protected. A possible alternative is 14 ... Qg6, hoping to defuse White's advantage in development with a Q exchange.

Later, if 17 ... Qxe2 then 18 Rfe1 is deadly, due to the weakness of e6.

Sep-01-21  Socrates2: More than one way to skin a cat here, but the given line seems the fastest.
Sep-01-21
Premium Chessgames Member
  drollere: this one was fun. i had 5. Ng7 Rxg7, 26. Rxg7 Qxh6, 27. Rg8+ and mate.

if 26. .. Qd8 27. Kf1. and if 25. .. Qg4, 26. Ne6+ Qxe6, 27. Rxe6.

Sep-01-21  Nichth: There is an elegance to the quieter 25. Ng7, disrupting black's mate in one whilst threatening black with the same fate.
Sep-01-21  Cellist: I also chose 25. Rxd7+ followed by 26. Qe7+. It also wins (+18) but is slower than the game line or 25. Ng7. I hoped to bring the Rc1 into play by taking on c5 wich check (either with R or Q). It is tricky because White always has to mind the threatening checkmate on g2. The engine actually sees 27. Rxc5+ as losing (-1.8), while 27. Qxc5+ wins handily (+18).
Sep-01-21  TheBish: <drollere: this one was fun. i had 5. Ng7 Rxg7, 26. Rxg7 Qxh6, 27. Rg8+ and mate. if 26. .. Qd8 27. Kf1. and if 25. .. Qg4, 26. Ne6+ Qxe6, 27. Rxe6.>

Obviously you mean 26...Qe8 27. Kf1 (with 28. Re1 to follow). But much stronger is 27. Bf4!


click for larger view

Now after 27...Qf8, White can win prosaically by 28. Rxd7+ Bxd7 29. Qxf8+ Be8 30. Qxf6+ Kc8 31. Qd6 (and 32. Qc7#), but quicker and prettier is 28. Rg8! Qxg8 29. Re1 with mate to follow in short order (29...Qe6 30. Rxe6 followed by mate at c7/e7).

Sep-01-21  TheBish: An interesting attempt for Black in the opening is 9...c4, threatening to trap the bishop with 10...a6 11. Ba4 b5. But this is refuted by 10. a4! (only move) 10...a6 11. Ba3+


click for larger view

Now if 11...Ne7 12. Be8! Kxe8 13. Qxg7 gives White a crushing attack (13...Rf8 14. exf6 or 13...Rg8 14. Qxh7 for starters), but a puzzle-like solution arises after 11...Kf7 (solution below if you want to find the forced mate). Spoiler alert!


click for larger view

12. Ng5+! fxg5 (or 12...Kg6 13. Be8+) 13. Qh5+! g6 14. Qf3+ Nf6 (14...Kg7 Q[B]f8#) 15. Qxf6+ Kg8 16. Qf8#.

Sep-01-21  GlennOliver: The choice -
25. Ng7 Rxg7 26. Rxg7 c4 27. Rxg6 hxg6 28. Re1 b5 29. Bf4 a5 30. Qc7# or via 30. Qe7# - is also rather pretty.
Sep-01-21
Premium Chessgames Member
  chrisowen: Talks i ooh tanks Rxd7 going i ooh a bluff affable offer it lofty crazy alive o hal so i ooh talks i ooh tanks girls baroque bridge i ooh quibble its veins flaps it happy with its way phooey how its cue it om dj its uvray i ooh obsolete again how its length grim its cdt i ooh awooga danglers forged its dogmatic totup foody able it leeway i ooh findy hiker grabs hangs i ooh bed its tyrant kedgeree weened its hay d7 i knew castle for example again ready break but erms cruising it for a bruising grubs hangy flack dj it eg reserve it dinners vital fish and chips ennui it is home i ooh Rxd7+ finish;
Sep-01-21
Premium Chessgames Member
  drollere: <The Bish: Obviously you mean 26...Qe8 27. Kf1 (with 28. Re1 to follow). But much stronger is 27. Bf4!>

yes, i forgot my own advice and did not copy worked moves from the "analysis".

27. Bf4 is another fun way to skin the cat. i did not see it.

i have to admit that once i saw Ng7 like a spanner in black's mating engine, i couldn't resist.

after 16. Qd6+ white orchestrates (or black blunders into) a position where many roads lead to mate.

Sep-01-21  King.Arthur.Brazil: May I be a fool? After 25. ♖xd7+ ♗xd7 (Forced, otherwise .26.♕e7#). Then, 26.♕e7+ A. 26...♔c7 27. ♗f4+ (a)♔b6 or ♔c6 28. ♕xc5# or (b)♔c8 28. ♖xc5+ ♗c6 29. ♕c7# B.26...♔c8 27. ♖xc5+ ♗c6 28. ♖xc6+ bxc6 29. ♘d6+ ♔b8 30. ♕b7# but 27. ♖xc5+♔b8 28. ♗f4+ ♔a7 and white has no immediate check-mate. Maybe, 26...♔c8 27. ♕xc5+ (if ♔d8 28. ♕e7# or 27...♔b8 28. ♗f4#) 27...♗c6 28. ♘e7+ win the ♕ is enough... lgs.
Sep-01-21  landshark: I stared at it for 15 minutes late last night with no breakthrough. Looked at it for 45 seconds this morning and found Ng7. Elegantly interferes with Black's mating threat while crushing his defenses. Didn't analyze out to M8 as per Stockfish, but I'll take the full point - a real win is always sufficient IMHO...
Sep-01-21  Stanco: King.Arthur.Brazil
as a black, Henrique Costa Mecking would play 28...Kb8 instead of 28...Bc6 (after 28.Rcx5+) 😊 🤔
Sep-01-21  HorsePlay: I went with 26 Rxc5

25. Rxd7+ Bxd7 26. Rxc5 Qf7 27. Qc7+ Ke8 28. Nd6+ Ke7 29. Nxf7

Which I think at least wins the queen?
Or am I missing a counter move? :)

Sep-02-21  Brenin: <HorsePlay>: 25 Rxd7+ Bxd7 26 Rxc5 Qxg2#
Sep-02-21  HorsePlay: Brenin talk
about being blind. Thanks.
Sep-02-21  King.Arthur.Brazil: <STANCO>: Sure! That's why I wrote: "but 27. ?xc5+?b8 28. ?f4+ ?a7 and white has no immediate check-mate." I was joking with the fact that apparently you have several check-mates with the ♖xc5+ but Kb8 frustrate all my evil hopes! So, So, I gave up and move to 27.♕xc5+ which seem to win.
Sep-02-21  Nullifidian: 25. ♖xd7+ ♗xd7 26. ♕b6+ ♔e8 (♔c8 27. ♘d6+ ♔b8 28. ♕xb7#) 27. ♖e1+ ♗e6 (♔f7 28. ♘d6#) 28. ♕xe6+ (♖xe6+ ♔d7 [♔f7 29. ♖e7#] 29. ♖e7+ [♕d6+ ♔c8 30. ♘e7#] ♔c8 ♕c7#) ♔d8 29. ♕d6+ ♔c8 30. ♘e7#
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