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Matthias Bluebaum vs Evgeny Najer
Aeroflot Open (2017), Moscow RUS, rd 4, Feb-24
King's Indian Attack: Yugoslav Variation (A07)  ·  0-1



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Kibitzer's Corner
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Premium Chessgames Member
  ChessHigherCat: Well, maybe there's a quicker way but this works:

25...Nxg4 26. hxg4 e3 27. Bxe3 Rf6 28. Bxd5 Bg3 29. Ra2 Ng5 30. Bg2 Nh3 31. Bxh3 Qxh3+ 32. Ke2 Rxf2+ 33. Kd3 Bf4 34. Kc4 Rxe3 35. Rxf2 Rxb3 36. Rxf4 Qd3+ 37. Kc5 Rxa3

Leading to this situation, with white to move on his last legs:

click for larger view

Jul-27-18  Mayankk: I tried 25... e3 to block Queen’s mobility on the e rank, then 26 Bxe3 Nxg4 to clear the way for h pawn to move further. After 26 hxg4 h3 27 Bxh3 Qxh3+ I had no clue. Maybe toss a few more pieces bravely and hope for some magic.

Which is simply to say I totally failed.

Premium Chessgames Member
  patzer2: Though it's not as strong as the game move 25...Bg3! -+ (-8.49 @ 26 ply, Stockfish 8), my attempt 25...e3 -+ (-3.19 @ 28 ply, Stockfish 8) also appears to solve today's Friday puzzle.

A key point where the game turns significantly in Black's favor is 21. Bg5? N8h7 ∓ (-1.25 @ 29 ply, Stockfish 8). Instead, 21. b5 Ra8 22. h4 ⩱ (-0.50 @ 29 ply, Stockfish 8) greatly improves White's survival chances.

Jul-27-18  Walter Glattke: 25.-Bf2 26.Qe3 Nxg4 27.hxg4 Rf6 28.Be1 h3
29.Bxh3 Rf3 no good moves for white here.
30.Qd2 Qxh3+ 31.Ke2 choice: e3 or Qxg4 what do you like?
Premium Chessgames Member
  ChessHigherCat: I found a much faster way than my first line:

25. Kf1 Nxg4 26. hxg4 e3 27. Bxe3 h3 28. Bxd5 Rf6 29. Ke1 Qxf2+ 30. Kd1 Rxe3 and white has nothing a few spite checks (and/or saccing the queen) against the threat of Re1#.

The game line wouldn't have occurred to me but I don't see anything wrong with mine.

Jul-27-18  Walter Glattke: * 25.-Bg3, not Bf2
Jul-27-18  Boomie: <ChessHigherCat: I found a much faster way than my first line: 25. Kf1 Nxg4 26. hxg4 e3 27. Bxe3 h3 28. Bxd5 Rf6 29. Ke1>

How about 29. Nc4 here? At first glance, I don't see how black prevents white from defending. That's a lot of lumber for white to use.

Jul-27-18  wtpy: Patzer 2, I went with e3 as well, but did not pick strongest line. 26 Be3 Ne4 27 Be4 and I recaptured with rook. Did not even consider 25 ..Bg3. It is very nice move.
Premium Chessgames Member
  ChessHigherCat: <Boomie> 29. Nc4 Ng5 30. Ne5 Bxe5 31. dxe5 Rxe5 with the threat of Ne4 and if Bd4 Ng3+ Qxg3 Qxg3 wins the queen. I haven't calculated it all out, I was just sawing logs, as they say.

Did you play through the first line I suggested?

Premium Chessgames Member
  morfishine: I settled on but didn't calculate past <25...Bg3>
Jul-27-18  hdcc: I got the first move, so I was on the right track. I wanted to follow up with e3, rather than first playing Bxf2 (I often find the right moves in the wrong order :-(

I find no-capture sacrifices (as offered by the original Bishop move) are the hardest to spot; giving up material for no material in return sets the psychological bar a little higher than normal.

Premium Chessgames Member
  malt: Have 25...N:g4 26.hg4 Bg3 27.g5

(25.fg3 h3 26.B:h3 Q:h3+ 27.Ke1 Rf6 )

27...B:f2 28.K:f2 e3+ 29.B:e3 Qg3+
30.Kf1 N:g5 31.Qb2 R:e3
Missed 25...Bg3

Jul-27-18  Cheapo by the Dozen: I failed pretty much the same way that <mayankk> did.
Jul-27-18  PJs Studio: I got every single black move wrong until Ng3+ and Qg1+ very nice calculation by Najer. Opening up the king’s position while whites pieces cannot help with the sacrifices on the other side of the board. Lovely.
Jul-27-18  PJs Studio: Is 30.Bf2 a better try?
Jul-27-18  PJs Studio: I ran it through SF... nope! Bf2 and everything else is worthless.
Jul-27-18  devere: According to Stockfish 8 Depth 36 the best move is 25...Bg3(-8.87) the second best move is 25...Nf8(-4.93), then comes 25...Rae6(-4.50) and 25...e3(-3.90). In other words, White's position is undefendable and almost any reasonable move wins for Black.
Premium Chessgames Member
  morfishine: <devere> Thank you
Premium Chessgames Member
  agb2002: Black has a bishop and a knight for the bishop pair.

The white queen controls the third rank. This suggests 25... e3:

A) 26.fxe3 Nxg4

A.1) 27.hxg4 Rf6+

A.1.a) 28.Ke1 Qxg2 29.Kd1 (29.Qd3 Qg1+ wins the queen or mates) 29... Rf1+

A.1.a.i) 30.Kc2 Rc8+ 31.Kd3 (31.Kb1 Rxc1+ 32.Bxc1 h3 looks winning) 31... Rxc1 32.Rxc1 Rxc1 33.Bxc1 h3 and White can't stop the h-pawn.

A.1.a.ii) 30.Be1 Bg3 31.Nc2 Bxe1 32.Nxe1 Qf3+ 33.Kd2 (33.Kc2 Qe2+ 34.Kb1 -34.Kc3 Rc8+ wins- 34... Rxe1 wins a piece at least) 33... Rf2+ 34.Kc3 (34.Kd3 Q(R)xe3#) 34... Rxe3+ 35.Nd3 Rxd3#.

A.1.b) 28.Ke2 Qxg2+ 29.Kd3 (29.Ke1 Q(R)f1#; 29.Kd1 Rf1+ transposes to A.1.a) 29... Qe4+ 30.Ke2 (30.Kc3 Rc8+ 31.Kb2 Rxc1 as above) 30... Qxg4+ 31.Kd3 (31.Kxf1 Qf3+ 32.Kg1 -32.Ke1 Bg3#- 32... h3 and mate next) 31... Qf5+ 32.Ke2 Rf2+ 33.Kd1 (33.Ke1 Qf3 wins) 33... Qf3+ 34.Kc2 Rc8+ 35.Kb1 (35.Kb2 Rxd2+ wins) 35... Qe4+ followed by Rxd2, with check or not wins a piece at least.

A.2) 27.Qxd5 Rf6+

A.2.a) 28.Ke2 Rf2+ 29.Kd3 Rxg2 wins a piece at least (30.Rh1 or 30.hxg4 Rxd2; 30.Rd1 Ngf6).

A.2.b) 28.Bf3 Qf2#.

A.2.c) 28.Ke1 Qg1+ 29.Ke2 Rxe3+ 30.Bxe3 Qxe3+ 31.Kd1 Qd3+ 32.Ke1 Bg3#.

B) 26.Bxe3 Ne4 looks very good for Black due to Rf6 and Bg3. For example, 27.Qxd5 Ng3+ 28.fxg3 Rf6+ (28... Rxe3 29.Rc8+ Nf8 30.Rxf8+ Kh7 31.Qf5+) 29.Bf4 Qxg3 followed by Rxf4 seems to win.

C) 26.Be1 e2#.

D) 26.Bc3 e2+ 27.Ke1 Bf4 creates a mating net.

Premium Chessgames Member
  Yuridmi: 26.fxg3 hxg3
27.Ra2 Nxg4

Shredder 12 rates this as even (yes I have old chess software). Black's win might not be so easy. Ideas?

Jul-27-18  cormier:

click for larger view

Analysis by Houdini 4: d 23 dpa done

1. = (0.09): 18.Qd2 Rc6 19.Rfe1 Nf8(T) 20.Rac1 Ng6 21.c4 Ne7 22.c5 Nf5 23.Nb5 Rce6 24.Bf1 Rc6 25.Rc3 Qd7 26.Rb3 Qd8 27.Rd1 Nxe3 28.Qxe3 Qd7 29.Qe1 Qd8 30.Re3

2. = (0.09): 18.Re1 Rc6 19.Qd2 Nf8(T)

Premium Chessgames Member
  patzer2: Apparently 18. b4? gave Black the advantage after 18...axb4 19. cxd4 Nf8 ⩱ (-0.45 @ 35 ply).

According to the computer, even stronger for Black after 18. b4? would have been 18...h5 19. Bg5 Nf8 20. Nc2 N8h7 21. Qd2 e3! 22. Bxe3 Ne4 ⩱ (-0.72 @ 36 ply, Stockfish 8).

Instead of conceding Black the advantage with 18. b4?, White could have held it level with 18. b3 Nf8 19. c4 = (0.00 @ 37 ply, Stockfish 8).

Premium Chessgames Member
  patzer2: <Yuridmi> <26. fxg3 hxg3 27.Ra2 Nxg4 28.Be3 Shredder 12 rates this as even...>

After 26. fxg3, Stockfish 8 gives 26...e3 27. Qxe3 Rxe3 28. Bxe3 Ne4 -+ ( -10.28 @ 33 ply) or 26...Nxg4 27. hxg4 Rf6+ -+ (-10.78 @ 33 ply) as winning for Black.

Premium Chessgames Member
  areknames: Thanks <patzer2>, I was also wondering what to do if White played 26.fxg3 and couldn't decide between 26..e3 and 26..Nxg4. I suppose one should always consider what happens if one's opponent actually accepts a sacrifice.
Jul-28-18  Boomie: <ChessHigherCat: Did you play through the first line I suggested?>

I cheated a bit with Stockfish since the tactics were way above my pay grade.

25...Bg3 is the engine's choice. After 25...Nxg4 26. hxg4 <Bg3> is the only winning move. 26...e3 27. Bxe3 Rf6 28. Rc2 ±.

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