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Fabiano Caruana vs Alexander Onischuk
US Chess Championship (2016), St Louis, MO USA, rd 6, Apr-20
Spanish Game: Morphy Defense. Neo-Archangelsk Variation (C78)  ·  1-0


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Kibitzer's Corner
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Premium Chessgames Member
  thegoodanarchist: FC is on a tear in this tournament.
May-08-16  Ayaend: I must comment this powerful game! And just say bravo Caruana.
Jul-19-16  sudoplatov: One does not so much force one's opponent to blunder as allow one's opponent to blunder.
Premium Chessgames Member
  OhioChessFan: One tempts one's opponent to blunder.
Premium Chessgames Member
  perfidious: < sudoplatov: One does not so much force one's opponent to blunder as allow one's opponent to blunder. >

As Bob Ciaffone has written: If you want a man to hang himself, leave some slack in the rope.

Jul-29-17  mathlover: fantastic game by FC
Premium Chessgames Member
  ChessHigherCat: <tpstar: 25. Re5!! is a remarkable resource. I wonder how far in advance he saw it.>

That's the move nobody would have thought of, if for no other reason than that there are so many other tempting (but probably inferior) moves like Rxa6 and Rxd6.

Premium Chessgames Member
  FSR: 25.Re5! is crushing, e.g. 25...Rxe5 (25...Bxe5? 26.Rd8#; 25...f5 26.Rxe4 fxe4 27.Rxd6! cxd6 28.c7) 26.fxe5 Bf8 27.Rd8 (or 27.Rd7; I don't think it makes much difference) Rb5 28.Rc8 and wins.
Dec-28-17  stst: Back rank weakness for Black loses the game.

25.Re5 is both a quiet and re-sounding move, and this wins it all... for if (A) .........RxR
26.fxR the B has nowhere to go, Bxe5 leaves room for the other R to go d8#, while R@b2 goes for defense will surrender the R@e4.

26.RxB cxR will let the White c-pawn advance.

The c3 pawn prevents a defense of Rb4, but even if this pawn is not there, White still wins for similar reasons.

Premium Chessgames Member
  wtpy: Saw this quickly. It is set up by white's c6 pawn and black's back rank weakness. The line I looked at was 25 Re5 Re5 26 fe5 Be7 27 Rd7 Bh4 28 Rc7 Rb8 29 Rb7 Rc8 30 c7 Bd8 31 Rb8. Black's sac of the exchange didn't delay matters too long. In an otb game Re5 might be easy to overlook, particularly with the attractive Ra6, where white is definitely better, maybe winning, but knowing it is puzzle alerts you to look for additional possibilities.
Dec-28-17  Walter Glattke: 25.-f5 26.Rxe4 fxe4 27.Rxd6 cxd6 28.c7 wins
Dec-28-17  scholes: What about 25 Rxd6?
Dec-28-17  mel gibson: I didn't see it.
This puzzle was difficult.
The computer agrees with the text &
gives White only a +2.51 advantage.

25. Re5 (25.
Re5 (♖a5-e5 ♖e4xe3 f2xe3 ♖b2-b8 ♖e5-a5 g7-g6 ♖a5xa6 ♔g8-g7 ♔g1-f2 ♖b8-b3 ♖d1-d3 ♖b3-b5 c3-c4 ♖b5-c5 ♖d3-d4 ♔g7-f6 ♔f2-f3 ♔f6-e7 ♔f3-g4 ♔e7-e6 h2-h3 f7-f5+ ♔g4-g5 ♔e6-f7 ♔g5-h4 ♔f7-g7 ♔h4-g3 ♔g7-f6) +2.51/24 161)

score for White +2.51 depth 24

Dec-28-17  sudoplatov: <scholes> I also suggested Rxd6. White's position seems so strong that this also works.
Premium Chessgames Member
  malt: Had 25.Re5 f5 26.R:d6 Rb1+ 27.Kg2 cd6
(27.c7 Rc4 28.Re8+ Kf7 29.c8Q)
27...Rb8 28.Re7 Kf8 29.c7 Rc8 30.Rd7 Ke8
Premium Chessgames Member
  agb2002: The material is identical.

Black threatens Rc4.

The pawn on c6 suggests 25.Rxd6 cxd6 26.c7:

A) 26... Rc4 27.Rc5 Rxc5 (27... dxc5 28.c8=Q(R)#) 28.Bxc5 wins decisive material.

B) 26... Re8 27.Rxa6

B.1) 27... Rc8 28.Rxd6 followed by Rd8 mates or wins decisive material.

B.2) 27... Rb7 28.Rc6 Rc8 29.Bb6 unclear (29... Rxb6 30.Rxb6 Rxc7 31.Rxd6 Kf8 32.Rd3 Rc4 33.Rf3 Ke7).


Another option is 25.Re5, to try and exploit Black's weak back rank:

A) 25... Bxe5 26.Rd8#.

B) 25... Rxe5 26.fxe5

B.1) 26... Ba3 27.Rd8+ Bf8 28.Bc5 wins a piece.

B.2) 26... Be7 27.Rd7

B.2.a) 27... Kf8 28.Rxc7

B.2.a.i) 28... Ke8 29.Rc8+ Bd8 30.c7 wins.

B.2.a.ii) 28... Rb8 29.Ra7 Rc8 30.Rxa6 wins two pawns.

B.2.b) 27... Bf8 28.Rxc7 with an extra pawn and threats Ra7, c7, Rc8-Bc5, etc.

B.3) 26... Bf8 27.Rd7 wins a pawn at least.

C) 25... f5 26.Rxe4 fxe4 27.Rxd6 cxd6 28.c7 wins.


I'd play 25.Re5.

Dec-28-17  lost in space: It took me a while to find 25. Re5!. First I was calculating 25. Rxd6 cxd5 26. c7 and I thought I have to make this pawn queening. But I haven't found a convincing way to achieve that.

Only after stopping calculating and having a new, fresh look to the position I found 25. Re5!

Premium Chessgames Member
  DarthStapler: Got it
Premium Chessgames Member
  patzer2: For today's Thursday (25. ?) puzzle solution, 25. Re5! wins decisive material after 25...Rxe3 26. fxe3 +- (+3.43 @ 37 ply, Stockfish 8) in the game continuation or 25...Rxe5 26. fxe5 Be7 27. Rd7 Kf1 28. Ba7! (diagram below)

click for larger view

as the passed pawn ensures White's victory.

In the diagram above, after 25. Re5! Rxe5 26. fxe5 Be7 27. Rd7 Kf1 28. Ba7!, play might continue 28...Rb5

[28...Ke8 29. Rxc7 Rd2 (29...Kd8 30. Rd7+ Ke8 31. Rb7 Ba3 32. Bc5! +-) 30. Bd4 Bd8 31. Rc8 Ke7 32. c7 Bxc7 33. Rxc7+ +- (+6.03 @ 28 ply, Stockfish 8)]

29. Rxc7 Bd8 30. Rc8 Ke7 31. c7 Bxc7 32. Rxc7+ +- (+ 5.70 @ 27 ply, Stockfish 8).

Premium Chessgames Member
  patzer2: According to our Opening Explorer, 9...Bg4 has not worked out well for Black as White won all three recorded games.

Instead, 9...exf3 has been more successful as it was good for a draw in Adams vs J C Schroeder, 2016 and I Popov vs J Carlstedt, 2015.

Dec-28-17  saturn2: I saw 25 Re5
a 25..f5 26 RxR fxR 27 RxB and
b 25..RxR 26 fxR Bf8 27 Bc5
Dec-28-17  saturn2: Correction
b 27 Rd8 g7 28 Bc5
Dec-28-17  Patriot: I was thinking 25.Rxd6 cxd6 26.Re5 dxe5 27.c7 but missed 27...Rc4. The motifs seemed to be there...
Premium Chessgames Member
  catlover: This one is a little out of my league. Congratulations to those who found 25 Re5.
Premium Chessgames Member
  Breunor: I also fell for 25 R x d6; I thought there would be enough to win, but Stockfish shows it as even. 25 Re5 is a beautiful move.
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