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Sergio Slipak vs Tomas Gibson
Villa Martelli (2008), Villa Martelli ARG, rd 9, Oct-18
Reti Opening: General (A09)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Dec-06-18
Premium Chessgames Member
  ChessHigherCat: I think this is winning for white:

33. Nh6 Qxf6 34. Nf7+ Kg7 35. Rde1 Kf8 (...Qxf3? 36. Ng5+) 36. Nxd8 Qxe7 (...Qxf3 37. Rf7+ Qxf7 38. Nxf7 Kxf7 39. Kf1) 37. Rxe7 Kxe7 38. Nxb7 Nxb7 39. Bxc6 Nc5 40. Kf1

Dec-06-18
Premium Chessgames Member
  ChessHigherCat: Damn, I missed the defense 35...Rd7.

Now you guys can all pretend to have found the winning line...

Dec-06-18
Premium Chessgames Member
  al wazir: I didn't come close to this one. But after 34. Ne5, is it really over?

34...Qxe5 35. Rxe5 Nd7.

A) 36. Re7 Kg8 37. Rg7+ Kf8. Now what? If 38. Rxg6, then 38...Ne5 39. Bxh5 Nxg6 40. Bxg6 Rd6.

B) 36. Re6 Kf8, threatening 37...Kf7 or 37...Kf8.

My idea was totally different: 33. Rde1 hxg4 35. f7 Qxe7 36. Rxe7 Rf8 37. Re8 Kg7 38. Rxf8 Kxf8 39. Bxg4 Kxf7, with a small advantage.

But 35...Kg7 completely foils it.

Dec-06-18
Premium Chessgames Member
  An Englishman: Good Evening: I didn't. The first move was hard enough, but the second and decisive move proved impossible.
Dec-06-18
Premium Chessgames Member
  wtpy: This was a hard, hard problem. I considered Rd4 but then tried to make f7 work. Not even.
Dec-06-18  FlashinthePan: My first idea was Rxd1, but I didn't find the winning continuation, then I saw Ne5 and really thought it was the right move, because I missed the simple defense of Qxf6. But damn, it didn't occur to me to combine Rxd1 and Ne5 as in the game.
Dec-06-18  newzild: I actually saw the game line, but didn't realise it was winning and gave up!
Dec-06-18  Tomate: 33.Rxd4 Qxd4 34.Ne5. White threats to mate by 35.Nxg6+ Kg8 36.Rg7# and the ending after 34..Qxe5 35.Rxe5 looks very bad. So it remains 35..Rd7 35.Nxg6+ Kg8
36.f7+ Kg7/Kh7 37.f=Q+ Kxg6 38.Bxh5+ Kxh5 39.Qf5+ Kh6 40.Qh7#
Dec-06-18  Walter Glattke: 33.Ne5 Qxf6, so 33.Rxd4 Qxd4 34.Ne5 Qxe5 35.Rxe5 Nd7 (Al Wazir) 36.Re7 Nxf6 36.Rxb7 c5 37.Rb5 white advantage, or worse B) 34.-Qa1+ 35.Kg2 Rg8? 36.f7? Rf8 37.Nxg6+ Kg7 - 36.Nf7+ Kh7 37.Ng5+ Kh8/Kh6 38.Rh7# C) 34.-Qa1+ 35.Kg2 Rf8 36.Nxg6+ Kg8 37.Rg7#
Dec-06-18  saturn2: Black has a queen for 2 pieces. After

33 Rxd4 Qxd4 34. Ne5 Qxe5 35. Rxe5

black gives back the queen for two pieces. Not very convincing for me with only a pawn plus.

Dec-06-18  mel gibson: Too difficult for me.

Stockfish 9 agrees with the solution:

33. Rxd4

(33. Rxd4 (♖d1xd4 ♕d6xd4 ♘g4-e5 ♕d4xe5 ♖e7xe5 ♘c5-d7 ♖e5-g5 ♘d7xf6 ♖g5xg6 ♖d8-f8 ♔g1-g2 a5-a4 b3xa4 ♔h8-h7 ♖g6-g5 ♔h7-h6 a4-a5 ♖f8-a8 ♔g2-f1 ♖a8-b8 ♔f1-e2 ♖b8-e8+ ♔e2-d3 ♖e8-d8+ ♔d3-c3 ♖d8-a8 ♖g5-f5 ♔h6-g6 ♖f5-e5 ♔g6-h6 ♖e5-g5 ♔h6-h7 ♔c3-d4 ♔h7-h6 ♔d4-e3 ♖a8-d8 a5-a6 b7xa6 ♖g5-c5 ♖d8-d6 ♔e3-f4 ♘f6-g4 ♗f3xg4 h5xg4 ♔f4xg4 ♖d6-g6+ ♖c5-g5 ♔h6-g7 f2-f4 ♔g7-f7) +4.62/28 )

score for White +4.62 depth 28

Dec-06-18  EIDorado: Found the line in about 15 seconds. Maybe the puzzles I recently did have something to do with it.
Dec-06-18
Premium Chessgames Member
  cocker: At first you wonder why Black resigned. Earlier in the game, 32 Rf8 should win for Black.
Dec-06-18
Premium Chessgames Member
  malt: Tough one, after a while came up with 33.R:d4 Q:d4 34.Ne5 Qa1+
(34...Ne6 35.N:g6+ Kg8 36.f7+ Kh7 37.f8/Q+ )

35.Kg2 Rg8 36.Nf7+ Kh7 37.Ng5+ Kh6/Kh8
38.Rh7#
I think Black must have a stronger defence to what I've put.

Dec-06-18  trnbg: 32...h5 was Black's decisive mistake. As >cocker< mentioned, 32...Rf8 was better, and 32...d3 should win as well.
Dec-06-18  zb2cr: To <saturn2>: White is two Pawns plus.
Dec-06-18
Premium Chessgames Member
  agb2002: White has a rook, a bishop and a pawn for the queen.

Black threatens hxg4.

White would like to play Ne5 with the threat Nxg6+ and mate next but 33.Ne5 is met with 33... Qxf6. This suggests 33.Rxd4:

A) 33... Qxd4 34.Ne5

A.1) 34... Rg8 35.Nf7+ Kh7 36.Ng5+ Kh6(8) 37.Rh7#.

A.2) 34... Ne6 35.Nxg6+ Kg8 36.f7+ Kg(h)7 37.f8=Q+ Kxg6 38.Rxe6+ and mate in two.

A.3) 34... Kg8 35.Rg7+ Kf8 (35... Kh8 36.Nxg6#) 36.Nxg6+ Ke8 37.Re7#.

A.4) 34... Qa1+ 35.Kh2 Qb1 (else as above) 36.Rg7 Rf8 (due to Nf7#) 37.Nxg6+ Qxg6 38.Rxg6 + - [B+3P vs n].

B) 33... hxg4 34.Rxd4 Rxd4 35.Re8+ Kh7 36.f7 Nd7 (36... Ne6 37.Rxe6 wins) 37.Rd8 Kg7 (37... gxf3 38.Rxd7 wins) 38.f8=Q+ Nxf8 39.Rxd4 gxf3 40.Rf4 followed by Rxf3 + - [R+2P vs n].

C) 33... Qb8 34.Ne5 Ne6 35.Rxd8+ Qxd8 (35... Nxd8 36.Nxg6+ Kg8 37.Rg7#) 36.Nf7+ and 37.Nxd8 wins.

Dec-06-18
Premium Chessgames Member
  Lambda: Got it in full. I was quite pleased to see instinctively that the position after 33.Rxd4 Qxd4 34.Ne5 looks very dangerous in a couple of seconds. Alternatives to 33...Qxd4 leave white clearly winning: 33...hxg4 34.Rxd6 Rxd6 35.Bxg4 or 33...Qb8 34.Rxd8 Qxd8 35.Ne5 Qg8 36.f7, while after 34.Ne5 white is threatening 35.Nxg6+ Kg8 36.Rg7#. There are three possible ideas to defend against it without obviously going material down, but they all fail: 34...Rg8 35.Nf7+ Kh7 36.Ng5+ and 37.Rh7# or 34...Ne6 35.Nxg6+ Kg8 36.f7+ or 34...Rd7 35.Nxg6+ Kg8 36.f7+ when in either case the pawn will queen with two pawns up at the very least and probably mate. So black's best option is to give the queen: 34...Qxe5 35.Rxe5 and white has a winning material advantage.
Dec-06-18
Premium Chessgames Member
  thegoodanarchist: No one has discussed the reply 34...Rd7

Maybe there is a mate for White, but I don't see one. So I thought the follow up would be

35.Nxg6+ Kg8 36.f7+ and White queens the pawn.

Any improvements?

Dec-06-18
Premium Chessgames Member
  Spassfish: What am I missing? 34...Qa1+ 35Kg2 or Kh2 Rd1 threatens mate in 2 with no way for white to keep black king in check to stop it. My brain hurts
Dec-06-18  dumbgai: <Spassfish> White mates first with 36. Nxg6+ Kg8 37. Rg7#.
Dec-06-18  dumbgai: <thegoodanarchist> 34...Rd7 35. Nxg6+ Kg8 36. f7+ Kh7 37. f8=Q+ Rxe7 38. Nxe7

White is up a bishop and two pawns, and is threatening mate. The only way for black to avoid mate is to trade queens and the endgame is trivial.

Dec-06-18
Premium Chessgames Member
  whiteshark: Missed the k-o-move of this decisive distraction. :(
Dec-06-18
Premium Chessgames Member
  Dionysius1: Hmm. Borderline worthy puzzle in my view. When Gibson sacrifices the ♕ for the ♖ he's two pawns down, and Slipak still has to win the game. It's not exactly a knock out.
Dec-06-18
Premium Chessgames Member
  PawnSac: < al wazir: I didn't come close to this one. But after 34. Ne5, is it really over? 34...Qxe5 35. Rxe5 Nd7.

A) 36. Re7 Kg8 37. Rg7+ Kf8. Now what? >

I was looking at..
34. Ne5 Qxe5 35. Rxe5 Nd7 36. Re7 Kg8
(and instead of Rg7+)
37. Be4


click for larger view

and if Nxf6 38. Bxg6


click for larger view

white had a winning ending here

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