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Rafael Duailibe Leitao vs Felipe de Cresce El Debs
81st Brazilian Championship (2015), Joao Pessoa, rd 7, Jan-22
Slav Defense: Modern Line (D11)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Apr-03-16
Premium Chessgames Member
  Penguincw: Finally! Baseball is <back>!

---

The dreaded Sunday puzzle.

Uh, how close did I come today? Well, I had 2 lines in mind:

- 19.Nxb5+ cxb5 20.Bxb5, threatening trouble on d7.

- 19.Rxc6+ Kxc6 20.Bb5+ Kb7 21.Rd7+ Kc8.

Unfortunately, in the 2nd line, it won't accumulate to anything, so that's not good.

The first line, I got the sacrifice right, but I didn't get black's response right. But what if black played 19...cxb5 20.Bxb5?

Well, just looking at e8, position looks equal. White has a few pawns for a piece, and more active pieces. I don't think getting to d7 does anything.

Apr-03-16  suenteus po 147: This is one of those depressing puzzles where I correctly guessed the move to play, but could claim no victory as I couldn't follow up with the proper sequence, nor do I understand the follow-up once revealed.
Apr-03-16
Premium Chessgames Member
  An Englishman: Good Evening: As happens often on Sunday, I found the correct lines, but thought this was an intuitive (a.k.a. speculative) sacrifice and not a combination that in reality White probably calculated through the very end. Still, can't complain about having a 6/7 week including Sunday.
Apr-03-16
Premium Chessgames Member
  patzer2: Completely missed the impressive combination solving today's Sunday puzzle starting with 19. Nxb5+! However, I found it entertaining and instructive playing it out with the computer.

Here's my move-by-move look with Deep Fritz 15:

<19. Nxb5+! Kb7>

19... cxb5 20. Bxb5 Be7 (20... h6 21. Rc6+ Kb8 22. Rd8+ Kb7 23. Rd7+ Kb8 24. Ba6 ) 21. Bxf4+ Nxf4 22. Rd7+ Kb8 23. Rxe7 Rf8 24. Bc6 Ng6 25. Rb7+ Kc8 26. Bd5 Nf4 27. Raxa7 Nxd5 28. Rxa8+ Kxb7 29. Rxf8 (+9.22 @ 22 depth, Deep Fritz 15)

<20. Bc4 cxb5 21. Bxb5 Bb4 22. Bc6+ Kb8>

22... Kxa6 23. Ra1+ Ba5 24. b4 Ne2+ 25. Kh1 Ng3+ 26. hxg3 Ne5 27. Rxa5#

<23. Bxa8 Kxa8 24. Rxa7+ Kb8 25. Rdd7> 1-0

Black resigns in lieu of 25...Ne6 26. Rdb7+ Kc8 27. Rxb4 Rd8 28. Rc4+ Kb8 29. Rxf7 Nd4 30. Bxd4 Re8 31. Ba7+ Ka8 32. Bc5 (#8 @ 29 depth, Deep Fritz 15)

P.S.: For a Black improvement, instead of 11...e5? 12. dxe5 (+0.91 @ 18 depth, Deep Fritz 15), the computer suggestion 11...a6 = (0.10 @ 22 depth, Deep Fritz 15) appears to hold it level.

Apr-03-16  dfcx: I found this POTD not as difficult as yesterday's. As soon as I saw that black could defend the a4-e8 diagonal everything falls into place.

19.Nxb5+

A. 19...cxb5 20.Bxb5 Bb4(what else?) 21.Rc6+ Kb8 22.Ba6 and mates soon.

B. 19...Kb7 20.Bc4! (this is probably the hardest move to make) cxb5 21.Bxb5 and text moves follows.

B1. if black plays 20...Kxa6?? 21.Nd6+ Ka5 22.Nb7+ Kb4 23.Bd2#

C. 19...Kc8 20.Rxc6+ wins

D. 19...Kb8 20.Bxa7+ wins

Apr-03-16  patfoley: I got the main ideas, but did not foresee how lost and bereft that Black black bishop would be.
Apr-03-16  not not: i was thinking top sacrifice rook with rxc6 then bxb5 then rd7 and rxf7 - 3 pawns for rook? I dont know if it is good
Apr-03-16  goodevans: The key move here - the move that makes this a <Sunday puzzle> - is <22.Bc6+>. The R is immune to capture as otherwise the black K is trapped in the a-file corridor with mate soon to follow.

l wish I'd seen that prior to playing it through!

Apr-03-16
Premium Chessgames Member
  morfishine: I thought it was <19.Rxc6+> followed by 20.Bxb5+

Chess960 will do this to you

Apr-03-16  wooden nickel: 19.Nxb5+ is "guessable", the hard part is upon 19... Kb7 In order to play the fantastic follow-up 20.Bc4!
We need to spot at least 1 of 2 beautiful checkmates. Upon 20... KxRa6 21.Nd6+ Ka5
22.Ra1+ Kb4 23 Ra4#


click for larger view

21.Nd6+ Ka5
22.Nb7+ Kb4 23. Bd2#


click for larger view

Apr-03-16
Premium Chessgames Member
  RandomVisitor: After 18...Kc7


click for larger view

Komodo-9.42-64bit:

<+5.02/38 19.Nxb5+ Kb7 20.Bc4 cxb5 21.Bxb5 Bb4 22.Bc6+> Kc7 23.Rd7+ Kc8 24.Rxf7 Rb8 25.Raxa7 Bd6 26.Bd7+ Kd8 27.Ba4 Kc8 28.Bd2 Ne5 29.Rxf4 Rb7 30.Rxb7 Kxb7 31.Bc3 Rc8 32.Rf5 Ng6 33.Rb5+ Ka6 34.Rd5 Bf4 35.Bb5+ Kb7 36.e5 Bg5 37.e6 Bf6 38.Rd7+ Kb6 39.Ba4 Bxc3 40.bxc3 Rc7 41.Kf1 h6 42.Ke2 Rc5 43.Kd2 Re5 44.f4 Nxf4 45.e7 Nh3 46.Rd6+ Kc7 47.Rd3 Nxf2 48.e8Q Rxe8 49.Bxe8 Nxd3 50.Kxd3

+1.30/38 19.Kf1 Nxe2 20.Nxe2 Ne5 21.Rda1 Nxf3 22.Kg2 Ne5 23.Rxa7+ Rxa7 24.Rxa7+ Kb8 25.f4 c5 26.Ra5 Nd7 27.Rxb5+ Kc7 28.b4 cxb4 29.Ra5 Be7 30.Ra7+ Kc8 31.e5 Rd8 32.Nd4 Bc5 33.Ra8+ Kc7 34.Nb5+ Kc6 35.Rxd8 Bxe3 36.Nd6 Bxf4 37.Nxf7 Nxe5 38.Rd4 Bxh2 39.Nd8+ Kc7 40.Ne6+ Kc6 41.Nxg7 Bg1 42.Rxb4 Nd3 43.Rh4 Bf2 44.Rh6+ Kb5 45.Ne6 Bb6 46.b3 Nc1 47.Rh3 Kb4 48.Nf4 Bd4 49.Nd5+ Kc5

+1.22/38 19.Bf1 Be7 20.Nxb5+ cxb5 21.Bxb5 Rhd8 22.Rc6+ Kb8 23.Rdc1 Bd6 24.Ba6 Ne7 25.Rxd6 Nh3+ 26.Kg2 Rxd6 27.Bc4 Kb7 28.Kxh3 Rd7 29.Bb5 Rd6 30.Bf4 Rg6 31.Rd1 Rf6 32.Kg3 Rg6+ 33.Kh4 Re6 34.Be3 Ng6+ 35.Kg3 Rc8 36.Bd7 Rd8 37.Bc6+ Kc8 38.Bd5 Re7 39.b4 Rc7 40.b5 Rd6 41.Ra1 Ne7 42.Bb3 Rcd7 43.h4 Rg6+ 44.Kh2 Rf6 45.f4 Kb8 46.f5

Apr-03-16
Premium Chessgames Member
  agb2002: White has the bishop pair for a bishop and a knight.

Black threatens 19... b4.

White can expose the black king with 19.Nxb5+:

A) 19... cxb5 20.Bxb5

A.1) 20... Be7 21.Rd7+ Kb(c)8 22.Bxf4 Nxf4 23.Rxe7 + - [2P].

A.2) 20... Bb4 21.Rd4

A.2.a) 21... Bc5 22.Rd7+ and 23.Bxc5 + - [2B+2P vs 2N].

A.2.b) 21... Be1 22.Kf1 Rb8 (22... Ne6 23.Rd7+ and 23.Kxe1 + - [2B+2P vs 2N]) 23.Rxa7+ Rb7 (23... Kc8 24.Ba6+ wins) 24.Rxb7+ Kxb7 (24... Kb6 25.Rb4(d5)#) 25.Kxe1 + - [2B+3P vs 2N].

A.2.c) 21... Bf8 22.Rc6+ Kb7 (22... Kb8 23.Rd8+ Kb7 transposes to this line) 23.Rd7+ Kb8 24.Ba6 and mate in two.

A.3) 20... Ne6 21.Rc6+ Kb8 (21... Kb7 22.Rd7+ Kb8 23.Ba6 as in A.2.c) 22.Ba6

A.3.a) 22... Ne7 23.Bf4+ (or 23.Rd8+ Nxd8 24.Bf4#) 23... Nxf4 24.Rd8+ Nc8 25.Rxc8#.

A.3.b) 22... Be7 23.Rd7 Nc5 (23... Nd8 24.Rc8#) 24.Bxc5 Bxc5 25.Rb7#.

B) 19... Kb7 20.Bf1

B.1) 20... Kxa6 21.Nd6+ Ka5 22.Rd4 and mate in two.

B.2) 20... cxb5 21.Bxb5 looks similar to A.

C) 19... Kb(c)8 20.Bf1 cxb5 21.Bxb5 look similar to A.

-----

I have also considered 19.Rxc6+ Kxc6 20.Bxb5+ Kb(c)7 21.Rd7+ Kc8 but I think it's lost for White.

Apr-03-16  The Kings Domain: Nice to have gotten this. Good combo by white.
Apr-03-16
Premium Chessgames Member
  Jimfromprovidence: Yes, if you saw 20 Bc4 or 20 Bf1 you get the grand prize.

But there is also another beautiful mate to find if 20...Kc8 had occurred.


click for larger view

Apr-03-16  1.e4effort: pretty easy for a Sunday, eh?
Apr-03-16  alphee: Missed this one, definitely. ♘xb5 was an option (as well as ♖xa7 or ♗xa7) but I ddn't manage the next moves.
Apr-04-16  stst: Got to be NxP+ or Bb5+...
Opt for NxP+ to expose the K....
Jan-03-18
Premium Chessgames Member
  offramp: <chrisowen: ... hubba bubba..> It's a hubba bubba nightmare!
https://www.youtube.com/watch?v=XN5...
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