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Hrant Melkumyan vs Alexander Donchenko
Bundesliga (2014/15), Berlin GER, rd 4, Nov-09
Nimzo-Indian Defense: Leningrad Variation (E30)  ·  1-0
ANALYSIS [x]

FEN COPIED

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sac: 27.Rxe6 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Nov-26-14  Captain Hindsight: Better would have been <32... h5=>


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and black is still in the game.

Oct-02-19
Premium Chessgames Member
  boringplayer: Seeing that White wins back the pawn and gets a strong passer wasn't too hard, but the ensuing play wasn't Medium/Easy for me. I don't think seeing only through 30. e6 counts here.
Oct-02-19  nalinw: I agree - the finish was not obvious at all. Black has two passers already - but White has threats to the King - and has to convert those into tempi to push the pawns .....
Oct-02-19  saturn2: 27.†Rxe6†fxe6†28.†Bxe6+†Kh8†29.†Bxc8†Rxc8†30.†e6-

I saw black has to give one piece in order to stop the e pawm. For example

30..Rc7†31.†e7†h6†32.†Rd8+†Kh7†33.†e8=Q†Bxe8†

But white has to take care that black will not push the queenside pawns. White should manage this however. For example

34.†Rxe8†c3†35.†Re1†c2†36.†Ba3†b437.†Bc1†b3†38.†- Bb2

Oct-02-19  nalinw: The engine gives only a small advantage to White after 30 e6 .... and suggests sacrificing a pawn by

32 ... b4

in order to push the other pawn to c2 quickly - before bringing the King to block the White passers

Oct-02-19
Premium Chessgames Member
  al wazir: I got the combination beginning 27. Rxe6, winning ♙. Big deal. The real challenge is winning the ensuing endgame.

As is usual in endgames, there I was clueless.

Oct-02-19  saturn2: Well black played 30..Be8. But white could have let follow e7, Rd8
Oct-02-19  Walter Glattke: 31.e7 c3 32.Rd8
Oct-02-19  Cheapo by the Dozen: Yet ANOTHER puzzle where I was right to give up, because the game line -- while clearly somewhat advantageous -- didn't actually force a win.
Oct-02-19
Premium Chessgames Member
  malt: 27.R:e6 fe6 28.B:e6+ Kh8 29.B:c8 R:c8 30.e6
Oct-02-19
Premium Chessgames Member
  whiteshark: <27. Rxe6 fxe6 28. Bxe6+ Kh8 29. Bxc8 Rxc8 30. e6>


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Black to move

1) +0.08 (31 ply) <30...Be8 31.f4 Kg8 32.Rc1 h5> 33.f5 Bc6 34.Re1 Rd8 35.f6 gxf6 36.e7 Rc8 37.Rd1 Kf7 38.Rd8 Rc7 39.Rf8+ Kg7 40.Bd6 Rb7 41.Rc8 Bd7 42.Bb4 Ra7 43.Rd8 Bc6 44.e8=Q Bxe8 45.Rxe8 Ra4 46.Bd2 b4 47.Rb8 c3 48.Be3 Kf7 49.Rb6 Ra1+ 50.Kf2 c2 51.Rxb4 c1=Q 52.Bxc1 Rxc1

2) +0.65 (30 ply) 30...Kg8 31.e7 Kf7 32.Rd8 Rc7 33.Rf8+ Kg6 34.h3 c3 35.Rf3 Bd7 36.Rxc3 Rxc3 37.Bxc3 Kf7 38.Bb4 Ke6 39.Kf1 Kd5 40.Ke2 Kc4 41.Bd6 b4 42.Kd2 b3 43.Ba3 g5 44.f3 h5 45.Bc1 Bc6 46.Ke2 Kd5 47.Bxg5

3) +0.72 (30 ply) 30...Re8 31.Rd6 Be4 32.f3 Bf5 33.e7 Kg8 34.Rd5 Be6 35.Rxb5 c3 36.Bxc3 Rxe7 37.Kf2 Kf7 38.Kg3 Rc7 39.Be5 Bd7 40.Rd5 Be6 41.Ra5 Rb7 42.h4 g6 43.Ra6 Bc4 44.Rc6 Be6 45.Kf2 Rd7 46.Bc3 Rd3 47.Rc7+ Rd7

6.0 minute analysis by Stockfish 9 v010218

It seems that <Captain Hindsight>'s comment is right.

Oct-02-19  5hrsolver: In the game line instead of 31.f4 I thought white wins with 31. e7 Ra8 32. Bc3 with 33.Rd8 to follow but the engine here says black simply replies with 32...Ra7 and 33.Rd8 does not work because 33...Rxe7 protects the bishop.
Oct-02-19  mel gibson: I saw that straight away however
Stockfish 10 is calling it a draw:

27. Rxe6

(27. Rxe6 (♖d6xe6 f7xe6 ♗f5xe6+ ♔g8-h8 ♗e6xc8 ♖f8xc8 f2-f4 ♔h8-g8 ♔g1-f2 h7-h5 ♔f2-e3 c4-c3 ♗b4xc3 ♗c6xg2 ♗c3-d4 ♗g2-h3 ♖d1-b1 ♖c8-c2 ♖b1xb5 ♖c2xh2 e5-e6 ♗h3xe6 ♖b5-g5 ♗e6-g4 f4-f5 ♖h2-h3+ ♔e3-f4 ♖h3-f3+ ♔f4-e4 ♖f3xf5 ♖g5xg7+ ♔g8-f8 ♖g7xg4 h5xg4 ♔e4xf5 g4-g3 ♔f5-g4 ♔f8-f7 ♔g4xg3 ♔f7-e6 ♔g3-h4 ♔e6-d5 ♗d4-e3 ♔d5-c4 ♗e3-d2 ♔c4-d5 ♔h4-g4 ♔d5-e6 ♗d2-e3 ♔e6-d5 ♔g4-f5 ♔d5-c6) +0.09/46 305)

score for White +0.09 depth 46

Oct-02-19
Premium Chessgames Member
  beenthere240: I think the point is that at the beginning of the puzzle White appears to be in a tough spot - a pawn down and Black with 2 connected passers. The combination puts White back in the game and gives Black opportunities to go wrong. I think itís instructive- if not especially deep. Not all PODs end in mate.
Oct-02-19  zb2cr: 27. Rxe6, fxe6; 28. Bxe8+, Kh8; 29. Bxc8 wins back the sacrificed exchange, plus a Pawn. The key is that it clears the way for White to advance his newly created passed Pawn.

This isn't a particularly well-posed problem. To me, it looks as though Black has counterchances, which he didn't make particularly good use of.

Oct-02-19  lentil: 37 Rd7!! is the money shot, After Bxd7, 38 Ke7 then Bc7 crushes
Oct-02-19
Premium Chessgames Member
  thegoodanarchist: GOTD Title:

Angry Hrant

Oct-02-19  DrGridlock: <I think the point is that at the beginning of the puzzle White appears to be in a tough spot - a pawn down and Black with 2 connected passers. The combination puts White back in the game and gives Black opportunities to go wrong.>

White to move and equalize is a different kind of Wednesday puzzle.

Oct-02-19  DrGridlock: From Chessgames:

<What kind of move am I looking for?

The goal is to find the best move, or sequence of moves, in the given position.

You do not always have to find a checkmate! Just find the best move. Usually, this move will lead to a superior position, either by a forced sequence of moves which leads to checkmate, or (more commonly) wins substantial material.

By "substantial material" we mean usually winning at least the exchange (i.e. trading a knight or a bishop for a rook). More commonly the winning move will net a whole piece (bishop/knight/rook) and sometimes will win the queen. Occasionally, the material will be only a single pawn--this usually happens in endgame situations where the extra pawn will surely decide the game.

The first move is not always the most difficult move to see. Sometimes, the initial move in the sequence is somewhat obvious, but the real solution to the position lies in the follow-up moves. In order to solve our puzzles, you must see enough moves to demonstrate that the initial move is correct. Simply guessing the first move, without understanding why it works, is not solving the puzzle.

Sometimes we will present a position where the player who is to move is in a nearly hopeless situation. In these positions you are expected to look for a way to draw the game instead of win it. We don't tell you that you are looking for a draw; you are expected to figure this out by the nature of the position.>

Oct-02-19  TheaN: As per <saturn2> and others, the sequence of <27.Rxe6 fxe6 28.Bxe6+ Kh8 29.Bxc8 Rxc8 30.e6=> is relatively obvious, and I was already pondering if this is winning for White. Alas, there isn't anything better and does give Black options to slip up.

What I missed however is that after 30....Be8 31.e7?! Ra8! which prevents 32.Rd8?? due to Ra1+. This forces f3 or f4 at some point, with =.

In the alternatives Black's <too late>, albeit just: 30....Re8?! 31.Rd6! puts the bishop in a pickle. Manageable after 31....Be4! ⩲ going around to g6 but White will be free to pick up everything on the queen side.

30....Kg8?! looks okay, but does more harm than good after 31.e7 Re8 (the point being 31....Kf7?! 32.Rd8! Ra8? (Rc7 ⩲) 33.Rf8+ Ke6 34.Rxa8 +-) 32.Rd6 ⩲ and the king isn't helping.

After 30....c3? Black wants too much too quickly: 31.e7 Re8 (else Rd8+ 1-0) 32.Rc1! ± and White picks up c3 without consequences.

I do like this one. You do feel White has a knockout, realize he doesn't, but ends up winning due to the complexity of the endgame. Not all opposite bishop endings are drawn, I guess.

Oct-02-19
Premium Chessgames Member
  Jimfromprovidence: Here is a side puzzle taken from the game of the day on September 24th. I posted it on that day but got only one taker <OhioChessFan> who solved it.

I figured it's worth reposting so here goes. In the text white played 79 g6 and won. But if white had played 79 Bh7+, below, instead, is it still a win for white?


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Here is the game link.
C Costello vs M Fogg, 2011

Oct-02-19
Premium Chessgames Member
  agb2002: White has the bishop pair for a bishop, a knight and a pawn.

After 27.Rxe6 fxe6 28.Bxe6+ Kh8 (28... Rf7 29.Bxc8 + - [B]) 29.Bxc8 Rxc8 30.e6

A) 30... Ra8 31.e7

A.1) 31... Be8 32.Bc3 (controls a1 and prevents g6 followed by Kg7)

A.1.a) 32... Kg8 33.Rd8

A.1.a.i) 33... Ra3 34.Rxe8+ Kf7 35.Rf8+ Kxe7 36.Bb4+ and 37.Bxa3 wins.

A.1.a.ii) 33... Ra2 34.Rxe8+ Kf7 35.Rb8 Kxe7 36.Rxb5 Rc2 37.Be1 Rc1 38.Kf1 c3 39.Ke2 + - [B].

A.1.b) 32... Ra3 33.Rd8 Kg8 (33... h6 34.Rxe8+ Kh7 35.Rh8+ wins) 34.Rxe8+ transposes to A.1.a.i.

A.2) 31... Re8 32.Rd6 Ba8(b7, e4) 33.Rd8 Bc6 and White doesn't seem to have made much progress apart from recovering a pawn.

B) 30... Re8 31.e7 Kf8 with the same conclusion as in A.2.

Apparently White can only expect a slight edge.

Oct-02-19
Premium Chessgames Member
  patzer2: <White to move and equalize is a different kind of Wednesday puzzle.> That was my thought as I got as far as 27.Rxe6 fxe6 28.Bxe6+ Kh8 29.Bxc8 Rxc8 30.e6 ⩲ to =.

P.S.: With a near level game coming out of our puzzle position, Black's mistakes come several moves later in the game.

Black's game goes bad with 32...Rb8?, allowing 33. Ra1! ± (+2.74 @ 33 ply, Stockfish 10).

Instead, 32...b4! = (0.00 @ 36 ply, Stockfish 10), 32...h5 = (0.00 @ 36 ply, Stockfish 10) or 32...g6 = (+0.09 @ 35 ply, Stockfish 10) hold the game level.

Oct-03-19  TheaN: <Jimfromprovidence> no, and an incredibly interesting concept as to why not.

In the starting position, after 79....Kh8 White can't play 80.g6 due to 80....Bxg6 1/2, as it threatens Bxh5 1/2, 81.Kxg6 and hxg6 stalemate, and after 81.Bxg6 White has the wrong bishop.

If White moves away, ie 80.Be3 Black counters with a sham sac 80....Bd4! as BxB is stalemate. Black does this on any bishop move that follows, and a pawn move is simply drawn after BxB.

The only exception is 81.Bg6 (at any point). Typically, now 81....Bf7? (never just play patterns) loses on account of 82.Bh7!! and Black to move! He has no Bg8? or Bg6? (BxB +-) so is forced to play 82....Be8 to keep tabs on g6 (82....Ba2 83.g6 with g7#). Now after 83.Bb1 (or any bishop move, though most consistent) White breaks the deadlock as Black can't threaten the 'stalemate en prise'. White will win after 83....Kg8 84.g6 Bf7! 85.gxf7+! Kxf7 86.Ba2+ Kf6 87.Bg8 and Black will never reach g7.

Instead, with the bishop on g6 and Black to move, Black can just lose a move as White isn't threatening anything! 81.Bg6 Ba2 82.Be8 Bf7 etc.

The final exception is back to h7: 81.Bh7, but now it's Black to realize that in the starting position, White had no winning move, so repeating 81....Bf7= brings him one move closer to a draw.

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