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Fabiano Caruana vs Arkadij Naiditsch
Tata Steel (2014), Wijk aan Zee NED, rd 10, Jan-25
Zukertort Opening: Symmetrical Variation (A04)  ·  0-1
ANALYSIS [x]

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sac: 36...Rdxf4 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Mar-18-16
Premium Chessgames Member
  Penguincw: How are your brackets going guys? I did make a bracket for fun, but it got busted after Yale - Baylor...

Anyway, Friday puzzle, can I carry some luck from yesterday?

Uh, no. I came up with the weird sequence of 36...Nf2+ 37.Qxf2 Rd1 38.Qxb6 Rxe1+ 39.Qg1 Rxg1+ 40.Kxg1 Bxg2 41.Kxg2, and at the end of it, white's up a knight.

FTR: When I saw this game, I thought it was from some Dortmund tournament; I was wrong.

Mar-18-16
Premium Chessgames Member
  al wazir: After 37. Bxb7 I think it goes like this: 37...Rf1+ 38. Rxf1 Rxf1+ 39. Kg2 Rf2+ 40. Qxf2 Qxf2+ 41. Kh3 Qf5+ 42. Ng4 Nf2+, winning the ♘. White holds out longer this way but still loses.
Mar-18-16  King.Arthur.Brazil: I found Rdxf4! and the following combination. The position remind me the old N mate done with Qg1+, Rxg1, Nf2#. But, in this case the Q at c2 will not permit, but there's only one R at the 1st rank, so doubling the rooks in the column will be the winning way. I'm happy to saw it!
Mar-18-16
Premium Chessgames Member
  agb2002: The material is identical.

White threatens 37.Rxb7 (37.Rxd1 Rxd1+ 38.Qxd1 Qxc7).

The bishop pin suggests 36... Ne3:

A) 37.Rxe3 Qxc7

A.1) 38.Qxc7 Rd1+ 39.Re1 Rxe1#.

A.2) 38.Rc3 Qxc3 wins.

A.3) 38.Qb1 Rdxf4 - + [R+P vs N] looks crushing. For example, 39.Re1 Qxe5 40.Rxe5 Rf1+ 41.Qxf1 Rxf1#.

A.4) 38.Qe2 Rdxf4 is similar to A.3.

B) 37.Rxb7 Nxc2 38.Rxb6 axb6 39.Rc1 Nxa3 - + [R+P vs B] and a won ending (40.Rc8+ Rf8 41.Rc6 Rd1+ 42.Bf1 Rxf1+, etc.).

C) 37.Rc8+ Bxc8 38.Qxc8+ (38.Rxe3 Bb7 - + [R vs N] with the threat Rdxf4) 38... Rf8 [R vs B], followed by Nxg2 and Rdxf4 with a won game.

D) 37.Nd7 Rxd7 just loses the knight.

Mar-18-16
Premium Chessgames Member
  agb2002: The text 36... Rdxf4 looks significantly better than my 36... Ne3.
Mar-18-16
Premium Chessgames Member
  patzer2: Feels as though I missed the obvious in not finding today's Friday solution 36...Rdxf4! (-8.94 @ 27 depth, Komodo 9.1).

My attempt was 36...Bxg2+ which fizzles out to level after 37. Kxg2 Rfxf4 = (0.00 @ 22 depth, Deep Fritz 15). Falling for 36...Bxg2+? =, and not even considering 36...Rdxf4! , reminds me of a V-8 vitamin/vegtable drink television commercial I saw a few years ago.

In the TV commercial, as I recall, a guy eats something like a candy bar and then slaps himself on the forehead when reminded of the obvious -- that he could have had a nutritious and satisfying vegetable vitamin drink (i.e. a V-8) instead of eating junk food.

After loading up the game on the computer with Deep Fritz 15 and seeing the complete combination 36...Rdxf4! 37. Rxb7 (37. Rxd1 Rf1+ 38. Rxf1 Rxf1#) 37... Nf2+ 38. Kg1 Nh3+ 39. Kh1 Rf1+ 1-0, where White resigns in lieu of 40. Rxf1 Rxf1+ 41. Bxf1 Qg1#, it became clearly obvious 33...Rxd4! was the strongest winning move.

Just as it takes more time and effort to find and consume nutritious food and avoid junk food, it takes more time and effort to consider and find deeper winning moves like 36...Rdxf4! and avoid simpler drawing moves like 36...Bxg2+ =.

P.S.: White apparently went wrong with 32. Re1?, allowing 32...Nxf4! (-2.46 @ 37 depth, Stockfish 5SE). Instead, 32. Qg1 = (0.00 @ 34 depth, Stockfish 270114 SE) holds it level.

Mar-18-16  dfcx: Black is already a pawn ahead, but white is about to take the bishop with Rxb7

My move is 36...Rdxf4! opens the path for the queen and white can't defend against Rf1+ and Nf2+ properly.

A. 37.Rxb7 Nf2+ 38.Kg1 (Qxf2 Qxf2 wins) Nh1+ 39.Kh1 Rf1+ 40.Rxf1 Rxf1+ 41.Bxf1 Qg1#

B. 37.Bxb7 Rf1+ 38.Rxf1 Rxf1+ 39.Kg2 Qg1+ 40.Kh3 Nf2+ 41.Kh4 (Qxf2 Qxf2 wins) Qxh2+ 42.Kg5 Qh5#

C, 37.Qxd1 Qxc2

Mar-18-16
Premium Chessgames Member
  gofer: Today's POTD is not easy. I cannot find the win with best defence. My best guess is that white has equality with a slight edge (i.e. a pawn) and not anything more. Really this was <Difficult>.

<36 ... Rd2>

This threatens smothered mate and Bxg7#, so white has no time for Rxb7 or Rc8+ any such ideas, white must take the rook.

<37 Qxd2 Nf2+>

Now that Rd4 has vacated d4 we can start playing some checks along the a7-g1 diagonal.

<38 Kg1 ...>

Now for the tricky bit

<38 ... Nh6+>

39 Kf1 Ba6+
40 Rc4 Rxf4+ (Nc4 Rxf4+ )
41 Nf3 Qg1+

<39 Kh1 Qxc7>
<40 Bxg7 Qxb7+>
<41 Qg2 Qxg2>
<42 Kxg2 Nxf4+>

Whoopee we have won a pawn!


click for larger view

Now the only question... ...what have I missed!?!?

~~~

Doh!

Mar-18-16
Premium Chessgames Member
  morfishine: What a conception, very nice
Mar-18-16
Premium Chessgames Member
  whiteshark: We passed... http://www.flickr.com/photos/expd/5...
Mar-18-16
Premium Chessgames Member
  diagonalley: ... help!... my PGN viewer is suddenly defaulting to some rather primitive application... has something changed at CG(?)
Mar-18-16  trnbg: I went with 36... Ne3, which should win at least the exchange, e.g. 37.Rxb7 Nxc2 38.Rxb6 axb6; or 37.Rxe3 Qxc7!, and White can't take on c7 because of the backrange mate threat. Or am I wrong?
Mar-18-16  moi: <diagonalley> Same for me! I hope the old PGN viewer will be fixed soon.
Mar-18-16  psmith: I am being sent to different game scores though the comments are clearly for the daily puzzle!
Mar-18-16  psmith: Every time I click it's a different game... But same comment thread. Is anyone else getting this?
Mar-18-16  luftforlife: <diagonalley>: For the first time ever, Java on my laptop just temporarily rejected <cg's> trusty pgn4web viewer. Seems all right now, though. Perhaps this is an incompatibility issue triggered by a Java update?
Mar-18-16  DLev: I am getting the same phenomenon as psmith. I am viewing on an I phone.
Mar-18-16
Premium Chessgames Member
  Jimfromprovidence: <al wazir> <After 37. Bxb7 I think it goes like this: 37...Rf1+ 38. Rxf1 Rxf1+ 39. Kg2 Rf2+ 40. Qxf2 Qxf2+ 41. Kh3 Qf5+ 42. Ng4 Nf2+...>

A cleaner way to win if 36...Rdxd4 37 Bxb7 Rxf1+ 38 Rxf1 Rxf1+ 39 Kg2 is 39...Ne3+.


click for larger view

Mar-18-16
Premium Chessgames Member
  chessgames.com: Please note that there have been some technical problems for the past 8 hours which we believe are now corrected.

At the same time, a Java update has caused some user of Chess Viewer Deluxe problems these two events are unrelated.

Mar-18-16  YetAnotherAmateur: I'm liking 36. ... Nf2+ to start. There are too many themes here to ignore it.

Variation A: White takes the bait:
37. Qxf2 Rxf4
A1) 38. Qe2 Bxg2+ 39. Kxg2 Rf2+ wins the queen
A2) 38. Bxb7 Rxf2 also wins the queen
A3) 38. Rxb7 Qxb7 39. Bxb7 Rxf2 leaves black with R vs B ending. A4) 38. Qxf4 Rxf4, obviously.
A5) 38. Qf3 Bxf3
A6) 38. other Q moves Rf1+ 39. Rxf1 Rxf1#

Variation B: White tries to refuse:
37. Kg1 Rd2

B1) 38. Qxd2 Ne4+ wins the queen.
B2) 38. Qc5 Bxg2 39. Qxb6 axb6 40. Kxg2 Ne3+ gives black a R vs N B3) 38. most other moves Nh3+ 39. Kh1 (Kf1 Qf2#) Qg1+ 40. Rxg1 Nf2#

There may be some variations I missed (if so, please let me know), but it looks pretty solid to me.

Mar-18-16
Premium Chessgames Member
  kevin86: Instead of a smothered mate, black will mate at g1 with the queen.
Mar-18-16  steinitzfan: Despite its brevity, this is a very deep combination.
Mar-18-16  luftforlife: <chessgames.com>: Thank you.
Mar-18-16  PJs Studio: I found 37.Rdxf4! and it was the only difficult move. 38. Kg1 was mandatory... Seeing the back rank after Nh3+ and Rf1 wasn't to tough.

Still a nicely played game! Big Caruana fan right here!!

Mar-18-16  PJs Studio: The knight d3, b2, d1 tour was really sharp. Naiditsch is a monster.
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