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Georg Danner vs Anthony C P Milnes
SenWM (2008), Bad Zwischenahn GER, rd 1, Oct-28
Dutch Defense: Semi-Leningrad Variation (A81)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
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Oct-09-18  saturn2: Black threatens Rh8. I thought of sonething else.

21 Nh5 is a double threat Rf1 and Nxg7.

Black has 21..Qe5 but 22. Rf1+ Ke8 23. Nxg7+ Kd7 24. Kd2 wins a piece.

Oct-09-18
Premium Chessgames Member
  boringplayer: I, too, went with 21. Nh5.
Oct-09-18  stst: I thought of something else...21.Ne6 threatening Qxg7+ IF NxN, Rf1 forks Q-K, Black Q lost.
Oct-09-18  Prosperus: Oh my God! I was considering 21. Rh5.
Oct-09-18
Premium Chessgames Member
  Check It Out: That is one cool combination.
Oct-09-18  AlicesKnight: 21.Nxg6 seemed fairly clear. Rf1 is a threat and escaping with ...Ke8 simply loses a rook. But the capture of the N makes it pretty.
Oct-09-18  cromat: sorry, for me is not so clear. Why is 21.NXg6 better as Nh5? Has white more advantage after 21.Nxg6 Ke8 22. Nxf8 Qxf8? Of course white win in both variants
Oct-09-18  malt: 21.N:g6 Qg5 (...Q:g6 22.0-0+ )
22.0-0+ Ke8 23.Kg2 R:f1 24.R:f1

Also
21.Nh5 Qe5 22.0-0+ Ke8 23.N:g7+ Kd7

Oct-09-18  et1: I also went with Nh5. O-O is stunning.
Oct-09-18  TheaN: 9 October 2018

<21.?>

This one had me questioning my ability to solve Tuesdays, but the plentora of threats that White has makes a lot of moves debatable.

White's threatening g6, a battery on the f-file, the Bishop on g7 if that can be reloaded.

Eventually I did note that <21.Nxg6!> actually demolishes every shed of defense Black thought he had. Captures a crucial pawn and threatens Rf1 as well as to continue pawn grabbing with Nxe7. If Black decides <21....Qxg6?> then either 22.Rf1+ or 0-0+ wins the Queen; I'd say safety wise, <22.0-0+ +-> is better.

I initially discarded <21.Nh5!?<>> because of <21....Qxh5?!<>> but White escapes with the Queen after <22.Rxh5 Rh8 23.Rf5+! gxf5 24.Qxf5 +- <>>. Slightly more involved than the game line and about half as good for White but still winning.

Oct-09-18  TheaN: Though if you look at the lines a bit more indepth, 21.Nxg6 may be better objectively Black might have more resources than after 21.Nh5.

In the latter, Black can pretty much only take on h5 to avoid peril and as long as White has seen 23.Rxf5+! he's clearly winning.

Some alternatives include: 21....Qg5 22.Kd2! or 0-0-0!, 21....Ke8 22.Nxf8 Qxf8 23.Ke2!, so it's not to say Black made it harder on White to play 21....Qxg6?

Oct-09-18  Mayankk: O-O is just fancy. Doesn’t Rf1 achieve the same result i.e. resignation?

I also went with Nh5. It seemed winning and usually once you spot a winning combination, you just flip over and confirm your solution. So I didn’t analyse Nxg6 at all...

Oct-09-18
Premium Chessgames Member
  agb2002: White has a knight for a bishop.

Black threatens Rh8.

White has Ne6 and Nxg6.

In the case of 21.Ne6 Nxe6 22.Rf1 (22.dxe6+ Qxe6 23.Rf1+ Ke8 24.Qxg7? Qxe3+ - +) 22... Qxf1+ 23.Kxf1 Ng5 -23... Rh8 24.dxe6+ wins- 24.Qh1 looks good for White.

-----

In the case of 21.Nxg6 (threatens 22.Nh8+ Rxh8+ 23.Qxf5+ Bf6 24.Rxh8 winning):

A) 21... Qxg6 22.Rf1+ Qf6 23.Rxf1+ wins decisive material.

B) 21... Qf6 22.Rf1 is even better.

C) 21... Qg5 22.Rf1+ Ke8 23.Qxg7 seems to win a piece at least. For example, 23... Qxe3+ 24.Ne2 Rxf1+ 25.Kxf1 Qf3+ 26.Ke1 and the threat 27.Qxe7# doesn't allow Black to recover material.

D) 21... Ke8 22.Nxf8 wins decisive material (22... Qxh7 23.Nxh7).

-----

21.Nxg6 looks far better than 21.Ne6.

Oct-09-18  goodevans: I too went for <21.Nh5> which should be good enough for a win but there's a trap to be avoided. After <21...Ne8> white can't play <22.Rf1?> because of <22...Qxf1 23.Kxf1 Rh8> winning back the Q with advantage to black.

White must instead play <22.g4 Qf3 23.Nf4 Qxe3+ 24.Nce2> after which the joint threats of 25.Ne6 and 25.Qxg6+ will win rewards.

Oct-09-18  Marmot PFL: Guess 21 Nxg6 is good enough.
Oct-09-18
Premium Chessgames Member
  patzer2: For today's Tuesday (21. ?) puzzle, the game continuation 21. Nxg6! sets up 21...Qxg6 for the winning Rook check 22. 0-0 + or 22. Rf1+ +-.

P.S.: So what was Black's decisive mistake?

Black's game took a turn for the worse with 14...c5?! allowing 15. exf5 Bxf5 16. Bh3 ± to +- (+1.29 @ 38 ply, Stockfish 9).

Instead, 14...Nxe3 15. Qxe3 e5 16. dxe6 Bxe6 17. 0-0-0 Bxc4 18. Rxd6 Bf7 19. Rhd1 a5 20. Rd7 Rc8 ⩲ (+ 0.54 @ 32 ply, Stockfish 9) would have improved Black's survival chances.

Early in the game, I don't like the passive, non-developing move 8...Qe8. Our Opening Explorer indicates Black has had more success with the popular move 7...c6 as in Black's win in Lautier vs Akopian, 1995 or the second most popular move 7...Na6 as in Black's win in Spassky vs M Santo-Roman, 1991.

Oct-09-18  Marmot PFL: Anyway this shows how fast black can lose in the Dutch with a few mistakes. For instance the passive 12...Nc7 when Nc5 fighting for e4 gives black good counter play. If 13 ef5 Bxf5 threatens Nd3+ so if 14 0-0 Ng4 and Ne5 and black is very much alive.
Oct-09-18  Marmot PFL: <patzer2> Yes 14...c5 looks bad too as it takes all pressure off white's center and black doesn't have time to do anything on the queen side.
Oct-09-18  olinart: Missing something with the game continuation. 22...Qf6 23. Rxf6+ exf6 and the material, Q+p for N+R, is not overwhelming, and black can hold out against the white attack.
Oct-09-18  Walter Glattke: 22.-Qf6 23.Ne4 Rh8 24.Nxf6 Rxh7 25.Nxh7+ Kg6 26.Rf8 overwhelming decisive material then.
Oct-09-18  Walter Glattke: No,is wrong (Bg7xf8) 22.-Qf6 23.Qh5+ Kg8 24.Rxf6 Rf6 25.Ne4 Rh6 26.Qf5 Rf8 27.Qd7 Ne8 28.Qxe7 going down over QxPP or Ng5.
Oct-09-18  Sniffles: As the sabre toothed kitty once remarked, "Bet you didn't see that one coming."

That has to be a contender for the most poisonous piece to ever grace a chessboard.

Oct-09-18  Volmac: Not to be confused with J H Donner vs Miles, 1977
Oct-09-18  olinart: Walter, your variation is not so different. 24. .. exf6 25. Ne4 Rad8 and the attack is blunted. Still plenty of play to convert the material advantage.
Oct-10-18
Premium Chessgames Member
  patzer2: <Marmot PFL> Thanks for suggesting the improvement 12...Nc5! ⩱ to = (-0.48 @ 37 ply, Stockfish 9):

[Stockfish 9 64, -0.48 @ 37 ply] 12...Nc5 13.Be3 Ncxe4 14.Nxe4 Nxe4 15.Qe2 Qf7 16.Rd1 Rab8 17.a3 Rbe8 18.Nh3 cxd5 19.Rxd5 Qe6 20.Ra5 Bc6 21.Nf4 Qf6 22.Rxa7 g5 23.Nd5 Qxb2 24.Qxb2 Bxb2 25.Rh5 Kf7 26.Bxe4 fxe4 27.Rh7+ Bg7 28.Nc7 Rc8 29.Ne6 Kxe6 30.Rxg7 g4 31.Rg6+ Kd7 32.Rxg4 Ra8 33.Rh4 Rxa7 34.Bxa7 Ra8 35.Be3 Rxa3 = (-0.40 @ 37 ply).

This thematic move (12...Nc5) in the Leningrad Dutch might well have been Black's last best chance to keep the game level or better.

Though after 13. Be3, instead of 13...Ng4? potentially allowing 14. Bd4 ± (+1.22 @ 25 ply, Stockfish 9), Black could have achieved equality with 13...e5 = (+0.07 @ 31 ply, Stockfish 9).

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