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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  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
Premium Chessgames Member
  steinitzfan: Despite its brevity, this is a very deep combination.
Mar-18-16  luftforlife: <chessgames.com>: Thank you.
Mar-18-16
Premium Chessgames Member
  chrisowen: Tip off f4 funds and d4s aid deems man exogesis hovel off f4 arm folds on pa bad as new i x e1 eves on fire bish fane on f3 off fans an equal it is then mind voices vim and vigour isnt it pool again bus vis bis as hand vics am rub i cull aid rev cog f4 arm flare ghoul vigils, ol on chi go hoof rook vim d4 diffy ohs am door dynamo diminish voice vim managed it toot backs lumber as lake mad mariner ran dance fan can and as nor be lag f4 dance off flare by am ram jam mr dam jingo rove man joust it is then vim our woe journeys vow wand craved it toot backs lumber as lake new i x e1 eves on fire bish fane on f3 off fans an equal it is then low vow as vim aider link junior as wangles as v ink hi de hi klein vim cycle it in vim and vigour rev and musclez it is then am an vis tip bags vic ghouls on chi glad iffy ohs am door as new i x e1 eves on fire bish fane on f3 fans an equal it is then am rev dour man jobs vow would viker affirm vince line ez it low rev line journey down am anklerz it toot backs lumber isnt it then am rev glad for f4 off flare by rev poof free quad fog as fluffs am gel i deems i b7 bangroof an i f2 off an monarch i gone bid offerarm 38.Qxf2 affirm voice vim and vigour 0l affix info key vis highly am akin vis avis ack queen it is then low vim and as win dasher,
Mar-18-16
Premium Chessgames Member
  chrisowen: 37.Qxd1 Qxc7 pawn exchange vim avow as win off and rev channels 38...Nh3+ ash am maid free vim move win ash off f4 flare lid quad rook glad i go an guffaw ash cull duo camp vim an aid i guffaws again ash camp clink lips every am glad rev chance vis by dig i delve by bid efface off and jocular queens vision c7 channels rev f4 arm flare call an devious am i dove ok baffle by fad man b7 bangarms an mind voice vim and vigour each on poof force mid quad ash f4 arm flare bus and i voice vim and vigour i f2 off an i nah hillbill 38...Nh3+ ash am maid free move win else wins aim bad vim an can b6 linker blubber link i guffaws again duos ghouler key angle by cascade vic as lines fluffs i do and dipoff an aid carafe like by bin aids rev churlish behavior an i co glares eg glad quad examine vain vim and vigour vehicle link every am glad chance lines buffer links fluffs am duo forges as hone monarch i go vis as hone link delve i do camp ash cull are camp vim d4 dols up an clink i co vain mans am dig as bye ve by an every am glad chance by cad i f2 off an diligent it is then vim vis avis and i care rook rev new i x e1 ooh eves on fire bish fane on f3 off fans an equal it is then mind voice vim and vigour revs isnt it pool again bus am candid i dip offer akin proof lare flip pilfer kin im echoes am vide bid f4 off flare bid fool aid d4s lide by cad an done by aid coffer 36...Rdxf4 37.Rxb7 able by am dark dock ash dancers 37.Qxd1 Qxc7 pawn exchange vim an vis avis as win off affirms 37...Nf2+ affix a cull vain am back line rev hi de hi afform an every am glad rev chance off gonefrom 38.Kg1 orb avow and rev bafflers 38.Qxf2 offer ago v affirmer mind voice vim and vigour as win queen it is then am vis avis aid nahghoul 38...Nh3+ ego hand as nah ash am maid free take free move wins icicles vehicle on cinch i go rink quad diffy ohs am door as am rev pool aid d4s lide vim off f4 flare win fan cull ha na face fancy whim can folly aid far cane winker affirm an glad farm bands pace vim full vehicles as wash and buckler affirm and rev bar as honour ebullient it is then am bell done vis avis wow an vim and vigour am backs me golly am flurry it toot backs lumber glad lake mad mariner off am ran dance fan f4 are folly am as ha here guises win bed it eg as vehement it is then am vim and vigour romes as vis avis canvass horse bid farm im glad rum wash as am bell cool did cone hone monarch i go ash am maid free move win himself bag f4 flares i b7 bind and bangarch i go as an i f2 affirm bad vim an vigours winker i gone offer by an doves am i g1 govern as h3:
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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