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Aljosa Grosar vs Milos Jirovsky
Groningen op (1991), Groningen NED, rd 1, Dec-21
Sicilian Defense: Dragon. Classical Variation General (B72)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Feb-16-21  little ernie: Easy ?^
Feb-16-21  mel gibson: The first move is obvious.

Stockfish 12 says:

25.Nxg6+

(25. Nxg6+ (♘e7xg6+ h7xg6 ♖f3xf7+ ♔f8-g8 ♖f7-g7+ ♔g8-h8 ♖g7-h7+ ♔h8-g8 ♖b7-g7+ ♔g8-f8 ♖g7xa7 ♔f8-g8 ♖a7-g7+ ♔g8-f8 e5-e6 ♖e8xe6 ♖g7-a7 ♔f8-g8 ♖h7-d7 ♖e6-e1+ ♔g1-f2 ♖e1-e8 ♖a7xa4 ♖c5xc3 h2-h3 ♖e8-f8+ ♔f2-g1 ♖f8-f7 ♖d7-d6 ♔g8-g7 ♖a4-a6 ♖c3-g3 ♔g1-h2 ♖g3-g5 h3-h4 ♖g5-g4 ♔h2-h3 ♖f7-f4 g2-g3 ♖f4-d4 ♖a6-a7+ ♔g7-h6 ♖d6-a6 ♖g4xg3+ ♔h3xg3 ♖d4-g4+ ♔g3-f3 ♖g4xh4 ♖a6-b6 ♖h4-h3+ ♔f3-f4 ♖h3-h4+ ♔f4-g3 ♖h4-g4+ ♔g3-f3 ♖g4-g1 a2-a4 ♖g1-f1+ ♔f3-e3 ♖f1-e1+ ♔e3-f2 ♖e1-a1 a4-a5 ♔h6-g5 ♔f2-f3 ♔g5-f5 ♖b6-b5+ ♔f5-e6 ♖a7-a6+ ♔e6-d7 ♖b5-b7+ ♔d7-c8) +6.48/45 82)

score for White +6.48 depth 45

Feb-16-21  saturn2: <melĀ gibson: The first move is obvious.> For Stockfish 12
Feb-16-21
Premium Chessgames Member
  drollere: pretty obvious for me too. the sacrifice pins the black K on the back rank.
Feb-16-21  Jimmy720: Medium
Feb-16-21  Walter Glattke: A)25.e6? Rxe7 (25.-Nxc3? 26.Rxf7#) 26.Rb8+ Kg7! (26.-Re8? 27.Rxf7+ Kg8 28.Rxe8#) 27.exf7 Rxf7 -+ B)25.Nxg6+ hxg6 26.R3xf7+ Kg8 27.Rxa7 Nxc3 28.Rg8+ Kh8 (Kf8 Raf7#) 29.a4 Rxe5 30.Rgb7 Re8 (30.-Re1+ 31.Kf2 Re2+ 32.Kf3 Rf5+ 33.Kg4 Rxg2+? 34.Kh3 Re2? 35.Ra8# or 35.Rb8#) 31.a5 Rf5 32.h3 Re1+ 33.Kh2 Ra1? 34.Rb8# /33.-Rf8 34.Rh7+ Kg8 35.Rag7# 31.a5 considered for +-
Feb-16-21  WorstPlayerEver: Fairly easy, after yesterday, but it does not pin the Black King to the back rank. White just stays two pawns up in a Rook end, which I probably would not have won anyway, but that is not the fault of this puzzle.
Feb-16-21  sfm: "Easy" to see that 25.NxP+ is good enough for a draw. Easy to see that there may be more.

Seeing through to 31.e6 and that the threat of 32.Rag7+ and 33.e7+ forces Black to return the knight, is, in my view, "hard".

Feb-16-21  saturn2: I concede 25.Ng6 is easy to spot as a move candidate (beside 25.Rxa7). But after 25...Kg6 26.Rfxf7 there remain some questions. Should white save the knight or prodect the passer on e5 etc. Is an ending 2 R+4P vs 2R+N easily won etc.
Feb-16-21
Premium Chessgames Member
  agb2002: White has an extra pawn.

The position of the black king and the pawn on e5 suggest 25.Nxg6+:

A) 25... hxg6 26.Rfxf7+ Kg8 27.Rg7+ Kh8 (27... Kf8 28.Rbf7#) 28.Rh7+ Kg8 29.Rbg7+ Kf8 30.e6 Re5 (30... Rc8 31.e7+ Ke8 32.Rg8+ Kd7 33.e8=Q+ wins) 31.Rf7+ Kg8 32.e7, threatening Rfg7#, wins decisive material.

B) 25... Kg7 26.Rbxf7+

B.1) 26... Kxg6 27.R3f6+ Kg5 (or 27... Kh4(5) 28.Rxh7+ Kg4(5) 29.Rg7+) 28.Rg7+ Kh5 (28... Kh4 29.Rh6#) 29.g4+ Kh4 30.Rh6#.

B.2) 26... Kg8 27.Rf8+ Rxf8 28.Rxf8+ Kg7 29.e6, followed by e7, wins decisive material.

B.3) 26... Kh6 27.Nf8 looks winning. For example, 27... Rcxe5 28.Rxh7+ Kg5 29.Rg7+ Kh6 (29... Kh4(5) 30.Rh3#) 30.Rg6+ Kh5 31.Rh3#.

C) 25... Kg8 26.Rfxf7 hxg6 (due to Rg7#) 27.Rg7+ transposes to A.

Feb-16-21
Premium Chessgames Member
  boringplayer: Puzzles are getting tougher. Sunday should be interesting..
Feb-16-21
Premium Chessgames Member
  agb2002: I forgot a subline in my line A: 30... Rxe6 31.Rxa7, with the double threat Rh8s# and Rxa4.
Feb-16-21  goodevans: <sfm: [...] Seeing through to 31.e6 and that the threat of 32.Rag7+ and 33.e7+ forces Black to return the knight, is, in my view, "hard".>


click for larger view

I'd agree. What's more you need also to consider <31...Re5> as a possible defence against that threat. It loses but seeing how isn't "easy" at all.

Feb-16-21  binesh.b: What's the continuation for White after 36. a4?
Feb-16-21  goodevans: <binesh.b> If you're asking what the quickest win is then I don't know precisely but it's clear that in the final position it's hopeless for black.

Black needs to keep one rook on his back rank to stop checkmate so there's little black can do to stop white advancing his a-pawn to promote. That's probably what I'd do as white but I dare say there's plenty of other ways to win from there.

Feb-16-21  Cellist: I found this problem quite difficult. After discarding e6 (after long thinking), I did see the moves until 31 and knew that somehow White needed to make a R move that simultaneously threatened mate and the undefended Black N, but that was not Tuesday level!
Feb-16-21
Premium Chessgames Member
  chrisowen: Ramificate Nxg6+ hubbub a flush plush backbeat wobble ivory noted vints flipbook it eg warms chair haves feels headquarter jovial its yen tenfold within it dug blip prams avids jilts awoogas guffaws totadd either ghost flash avids abind light it is pedigree Nxg6+ fag;
Feb-16-21
Premium Chessgames Member
  gawain: Hard for a Tuesday! I was looking for a mate that wasn't there. Which is my fault, not the puzzle's.

White sacrifices the knight and gets two pawns immediately. Soon he gets another pawn and Black's knight. That certainly wins.

Feb-16-21  njchess: While the immediate 25. ♘xg6+ and the ensuing rook moves gives White an advantage, it's not clear it is a winning one. It is also not clear on move 25, how important a role that 31. e6 will play. Good puzzle.
Feb-16-21
Premium Chessgames Member
  chrisowen: Dapper gent no yes no clean up?
Feb-16-21  TheaN: I saw <25.Nxg6+ hxg6 26.Rfxf7+ Kg8 27.Rg7+ Kh8 (Kf8 28.Raf7#) 28.Rh7+ Kg8 29.Rxa7> winning three pawns for the piece, threatening mate on h8 and attacking Na4, yet missed the relatively to the point Kg8.

The key to these 'back rank binds' is the limited reply scope. After 29....Kg8:


click for larger view

White has taken three pawns for the knight and is facing 4:1, however, can't take Na4 now due to losing Rh7. The rooks alone can't finish the job, so 30.e6! is left, given 30....Rxe6 (else 31.Rag7+ Kf8 32.e7+) 31.Rhd7! and now the <combined> threat of Ra8# and Rd8# force Black to throw Na4. This is beyond a Tuesday scope, I feel, so it's quite hard today.

Feb-16-21  Tiggler: I never found 31e6, so I failed to solve this one. Pretty unusual for a Tuesday.
Feb-16-21  Refused: 25.Nxg6+ is pretty much the only move that screams out as a puzzle solution. After the usual 25...hxg6 26.Rfxf7+ Kg8 27.Rg7+ Kh8 28.Rxh7+ Kg7 29.Rbg7+ Kf8 30.Rxa7 Kg8 we finally reach a critical position of the line. 31.e6! is rather difficult to spot from the starting position. Not typical Tuesday stuff imho.
Feb-16-21
Premium Chessgames Member
  Jimfromprovidence: This is a tricky but very instructive puzzle. 31 e6 is very nice as others have pointed out. What's also interesting about e6 is that white could have played it on moves 29 and 30 as well with the same result.

Here after 29 e6 Rxe6 30 Rbg7+ Kf8 31 Rxa7 Kg8 32 Rhd7 the position is identical to the text.


click for larger view

Feb-16-21  goodevans: <Jimfromprovidence: [...] What's also interesting about e6 is that white could have played it on moves 29 and 30 as well with the same result.>

... or even on move 28!

I had noticed earlier that <agb2002> was playing it a move earlier than in the game so I checked it out and he was absolutely right.

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