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Ernesto Inarkiev vs David Temirkanov
Russian Championship Higher League (2012), Tyumen RUS, rd 11, Jun-27
Sicilian Defense: Old Sicilian. General (B30)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
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Apr-06-18
Premium Chessgames Member
  Gregor Samsa Mendel: To my eyes, 21 O-O-O fairly screams out to be played.
Apr-06-18  ChessHigherCat: The main problem is that the obvious 21. fxe5+ would be met with Rxe5+ followed by some nasty queen checks. Then I remembered that you can assume that neither the king or rook has moved so 21. O-O-O. Then, after dithering around on WinBoard a minutes I found this line, which probably doesn't anticipate the best defenses:

21...Bxa4 22. fxe5+ Rxe5 23. Qf4+ Ke7 24. Rh7 Rf5 25. Re1+ Kf8 26. Qxd6+ Kg8 27. Reh1 Rh5 28. R7xh5 gxh5 29. Qxb8+

Apr-06-18  Honey Blend: Just wondering if ignoring the back rank threat is worth it, e.g. 26. gxf7 ♕a1+ 27. ♔d2 ♖f8 etc.


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Apr-06-18  ChessHigherCat: After some more diddling around, I found this line, which still works with an improved defense by black:

21. O-O-O Bxa4 22. fxe5+ Rxe5 23. Qf4+ Ke7 24. Rh7 Rf8 25. Rf1 Rf5 26. Re1+ Kd7 27. Qe4 Re5 28. Qg4+ Rf5 29. Qxg6 Rf4 30. Qe6+ Kc7 31. Qe7+ Kb6 32. Qxd6+ Kb7 33. Qxf4 Bxb3 34. Re7+ Kc8 35. Qf5+ Kb8 36. Qe5+ Ka8 37. Re8+ Rxe8 38. Qxe8+ Kb7 39. Qc6+ Kb8 40. Rh8+ Qd8 41. Rxd8#

Apr-06-18  stst: do a pause move- long castle first, the rest not too difficult... 21.0-0-0 Black has no good moves... e.g. Bf5 invites 22.g4 ... etc
if K moves, then 22.PxP...
sleeping time...let's see...
Apr-06-18  landshark: This is a wild one. I tried Qf2 with the idea of 21... exf4+, 22.Kd2 and looks safe there while Black's king is now very exposed. Thought about O-O-O but didn't see how strong White's threats are after Rf1 and feared Black's counterattack starting with ... Bxa4. No point tonight /:
Apr-06-18  pdxjjb: After having a shot at this one, you should analyze it with an engine. The results are amusing.
Apr-06-18  stacase: Queen side castle solves a lot of problems for White.
Apr-06-18  Walter Glattke: I think, 21.-Bf5 could be answered with 22.g4!, so the counter attack 21.-Bxa4 is forced. 21.-Rh8? 22.fe5+
Apr-06-18
Premium Chessgames Member
  patzer2: For today's Friday (21. ?) puzzle, our Stockfish 9 analysis of move 21...? indicates my try 21. fxe5+? fails to 21...Rxe5+ ∓ (-1.20 @ 20 ply).

So as <Gregor Samsa Mendel> observes, I should have seen that <21 O-O-O fairly screams out to be played.> After 21. 0-0-0, the only possibity I found difficult was the non-played move 22...Bxb3 when our Stockfish 9 analysis of move 23.? indicates it's mate-in-seven after 21. fxe5+ Ke7 22. Qg5+! +-.

Apr-06-18
Premium Chessgames Member
  patzer2: Our Stockfish 9 tool's analysis of move 20...? indicates 20...exf4+ = (0.00 @ 24 ply) would have saved Black's game.
Apr-06-18  Mayankk: 21 0-0-0 Bxa4 indeed came first to my mind, given the other White moves tend to result in a counterattack on White king instead. But I had 22 fxe4+ after that and then tried to harass the Black King from different sides.

Not sure if 22 Re1 is the only White win or if 22 fxe4+ also has some merit.

Apr-06-18  cocker: Computer analysis suggests that White made several mistakes after 21 0-0-0. 22 Qf2 (or Rh7) and 25 Qf2+ would have been much better.
Apr-06-18  Walter Glattke: White had an one-move-earlier-mate in case of 22.-Bxb3? e.g. 23.fxe5++ Ke7 24.Qg5+ Kd7
25.Rxf7+ Kc8 26.Qg4+ Re6 27.Qxe6+ Kd8
28.Qd7#
Apr-06-18
Premium Chessgames Member
  morfishine: <26...hxg6>???? huh?

I guess mabye it didn't matter at that point

*****

Apr-06-18  get Reti: Castling seems like too "normal" of a move to me to use as a puzzle.
Apr-06-18  EdC: I don't see anything quick after 26...Rf8
Apr-06-18  Pasker: I couldn't find a puzzle type of move so I gave up and instead played natural castle long side. Bang! problem solved :-)
Apr-06-18
Premium Chessgames Member
  Jimfromprovidence: This is not an easy puzzle.

One of the things I noticed the difference is between the text 22 Rf1 and the suggested 22 Qf2 is that white can no longer play 22...e4.

If 22 Qf2 e4 then white (per the Stockfish output) has the subtle 23 Rh7+, below, threatening 24 Qh4+ and mate.


click for larger view

In another line 22 Qf2 Bxb3, then white has 23 fxe5+ Ke7 Qf6+.


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Apr-06-18
Premium Chessgames Member
  patzer2: <Mayankk: ...Not sure if 22 Re1 is the only White win or if 22 fxe4+ also has some merit.> According to our Stockfish 9 tool's analysis of move 22...?, Black can hold with only a slight edge for White after 22. fxe4+ ⩲ (+0.57 @ 22 ply).

According to the analysis of move 22...?, not much stronger was the game move 22. Rf1 ± (+0.96 @ 22 ply).

Best, according to the analysis of move 22.?, is the strong winning follow-up move 22. Qf2 +- (+5.72 @ 25 ply) which White missed in the actual game.

Apr-06-18  sombreronegro: One of the few times I would have found the move easier in the actual game. It did not occur to me that castling was still on the table with what was so well into the middle game.
Apr-06-18  gym: How should we know whether castling is a legal move in this situation without checking the previous moves?
Apr-06-18
Premium Chessgames Member
  agb2002: Black threatens exf4+ and Rh8.

The position of the black king suggest f5 and O-O-O (if possible).

In the case of 21.f5 Black can play 21... Rh8, perhaps followed by g5, and the black king looks safer.

Since I don't know whether 21.O-O-O is even legal, I'll stop here but I think that's what I'd play with the idea fxe5+ followed by Rf1+ with attack.

Apr-06-18  ruzon: <EdC: I don't see anything quick after 26...Rf8>

26...Rf8 27. Rh7 Bxg2 28. Rxf7+ Rxf7 29. Qxf7+ Kd8 30. g7 +-

Apr-06-18  Carlos0012358: 21.O-O-O definitely legal and definitely best.

I would not do 21.f5. Very weak, gives black a by and a chance to attack the white R with 21.....Rh8.

21.....Bxa4 is an awful move. Gives white the opportunity to attack by mobilizing the Q.

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