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Liuben D Spassov vs Petar Popov
Stara Zagora (1977), Stara Zagora BUL
English Opening: Agincourt Defense. Catalan Defense (A13)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Given 22 times; par: 25 [what's this?]

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sac: 20.Ng6+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
Jan-22-21  Cellist: I also went with 20. Qh5, expecting 20. ... Nf8 21. Bf7. I wanted to keep the N for a later sacrifice, for example after g6. The engine indeed gives 20. Qh5 as the best move. If you do the engine analysis after 20. Ng6+, the engine says "mated-in-11," however. Puzzling. Still, 20. Qh5 seems to be an alternative solution, leading to +1.86.
Jan-22-21  TheaN: I had the original idea, but went with the direct <20.Ng6+ hxg6 21.Qg4 Nf8> 22.Qh3+?! which probably still wins, but it's far from best.

I completely misjudged the power of the diagonal defenses here. After 22....Nh7 23.Bf7 Bc8 24.g4 Bxg4! solves most of Black's problems, 25.Qxg4 f5! 26.exf5 gxf5 27.Qxf5 Bg6 ± and the attack is gone. Similarly and worse, after 22.Qh4+ Nh7 23.Bf7 f5 -+ and Black is winning.

"When you see a good move": <22.Bf7!> first is infinitive better. The point is that by delaying the queen check, White has not committed to either h3 nor h4. After <22....Bd5>, the only thing that follows are pointless delays: <23.exd5 #9 f5 24.Qh3+ Nh7 25.Bxg6 Bh4 26.Qxh4 Kg8 27.Qxh7+ Kf8 28.Qh8+ Ke7 29.Qxg7+ Kd6 30.Qxe5+ Kd7 31.Bxf5#>

Jan-22-21
Premium Chessgames Member
  chrisowen: Magnum i vouchsafe Ng6+ hubbub abacus aloofs blacks against i vouchsafe quality qh5 geckos victory acrids vouchsafe modify giveus bottoms up garcon i vouchsafe prowled its daiquiri vouchsafe quicks witwicky i vouchsafe joey fuzzy its vibrant than eon one plod vindicate i vouchsafe easy diffs i vint zit muck i vouchsafe it would totups flicks damage aka founts huddle it aka victor ng6+ duck;
Jan-22-21
Premium Chessgames Member
  agb2002: The natural move is 20.Qh5 but White can consider also 20.Ng6+ to expose the black king, so that after 20... hxg6 21.Qg4 Nf8 22.Qh3+ (22.Qh4+ allows g5 with tempo) 22... Nh7 23.Bf7:

A) 23... g5 24.Bg6 Kg8 25.Qxh7+ Kf8 26.Qh8#.

B) 23... Bd6 24.Bxg6 Kg8 25.Qxh7+ Kf8 26.Qh8+ Ke7 27.Qxg7#.

Jan-22-21
Premium Chessgames Member
  agb2002: I missed 23... Bc8. <TheaN> has already explained the details.
Jan-22-21  Brenin: Back's big mistake seems have been 16 ... e5, allowing 17 d5 which creates a passed pawn and an outpost for White's LSB on e6, where it can drive Black's K into the corner, away from useful defenders, and can dominate the K-side. Reinforcing e6 with 16 ... Rf7 and 17 ... Nf8 would have been safer, if rather passive.
Jan-22-21
Premium Chessgames Member
  chrisowen: Slow bargain yeah g6 numbers up no? Good luck ng6 flag on?
Jan-22-21
Premium Chessgames Member
  Jimfromprovidence: I almost never get a Friday puzzle, but
once I figured out that the pawn on e4 prevented any piece but the knight to help black defend, I knew that 20 Ng6+ was the way to go.

I am having trouble with the move before the puzzle, 19...Rfd8. Don't see the threat white had to suggest that move for black. In hindsight 19...Rfb8, below, allows the queen to help defend the text combination.


click for larger view

Jan-22-21  King.Arthur.Brazil: In reality, the "difficult" is more connected to the correct moves following the sacrifice (which I hope, many had seen). After the obligatory 22...♘f8 the correct move is 23.♗f7 first, because 23...♕c8 or ♗c8 is answered with 24.♕h4+ ♘h7 25.♗xg6 when check-mate is unavoidable. King repeats "Every badplayer doesn't resist of giving checks", so the 23.♕h3+ only comes to the same thing, when Black also plays bad, (e.g.: 23...♗d6 24. ♗xg6 ♔g8 25. ♕xh7+ ♔f8 26. ♕h8+ ♔e7 27. ♕xg7# ). It is a mistake, as folows: 23...♘h7 23. ♗f7 ♗c8. Now, 24.♕h4 f5 25.♕h3 (Obviously, not 25.♗g5?? ♗xg5). 25...f4! 26.g4 ♗g5 27.♗xg6 ♗h6! 28.♕h4 ♘g5 and Black will probably win, with a ♘ advantage by a ♙!
Jan-22-21  King.Arthur.Brazil: My friend Jim(<Gim from "providence"> cold or on the rocks, with slices of cucumber; it is a very nice drink!, lgs), maybe Black didn't see the direct sacrifice (20.♘g6+) and only made an plausible answer to 20.♕g4 which threatened {21.Bxd7). Wondering: 19...g5 20. ♘g6+ hxg6 21. ♕g4 ♖fd8 22. ♕h3+ ♔g7 ok, but another way 19...g5 20. ♘f5 ♗d8 21. ♕h5 and Black position still is bad. So, he decided to take the ♖ to d8, clearing f8 to another pieces. For your move, the King sees the following 19...♖fb8 20. ♕h5 ♘f8 21. ♗f7 ♗d6 22. ♘g6+ ♘xg6 23. ♗xg6 h6 24. ♗f5 ♕d8 25. ♕g6 ♕g8 26. ♗xh6 gxh6 27. ♕xh6+, for example. Really, Black is smashed with it is own pieces.
Jan-22-21
Premium Chessgames Member
  Diademas: I went for 20.Qh5, patted myself on the back and than looked disappointed at the solution.
Same procedure as always.
Jan-22-21  mlskdney: knight takes pawn g6 square and then queen goes to h4 square
Jan-23-21  sfm: Let me see, YES, obviously a mate in 12, ending like this after best defense


click for larger view

Oh, let me check with Stockfish if there are any mistakes?

20.Ng6+ hxg6 21.Qg4 Nf8 22.Bf7 Bxd5 23.exd5 f5 24.Qh3+ Bh4 25.Qxh4+ Nh7 26.Bxg6 Kg8 27.Qxh7+ Kf8 28.Qh8+ Ke7 29.Qxg7+ Kd6 30.Qxe5+ Kd7 31.Bxf5#

No, Stockfish calculated correctly.

Feb-24-21
Premium Chessgames Member
  An Englishman: Good Evening: Still repeating.
Feb-24-21  saturn2: The Be6 locks the king to the h file which white opens by 20. Ng6+ 

20....hxg6 21. Qg4 Nf8 22. Bf7 Bc8 23. Qh4+ Nh7 - 24. Bxg6 and black has no defence

Feb-24-21  mel gibson: Stockfish 12 says mate in 12:

20. Ng6+

(20. Ng6+ (♘h4-g6+ h7xg6 ♕d1-g4 ♘d7-f8 ♗e6-f7 ♗b7xd5 e4xd5 f6-f5 ♕g4-h3+ ♘f8-h7 ♗f7xg6 ♗e7-h4 ♕h3xh4 ♔h8-g8 ♕h4xh7+ ♔g8-f8 ♕h7-h8+ ♔f8-e7 ♕h8xg7+ ♔e7-d6 ♕g7xe5+ ♔d6-d7 ♗g6xf5+) +M12/72 28)

Feb-24-21  Walter Glattke: Get always mate, 22.-f5 23. Qh3+ Nh7 24.Bxg6 Bh4 25.Qxh4 Kg8 25.Qxh7+ Kf8 26.Qh8+ Ke7 27.Qxg7+ Kd6 28.Qf6# 22.-Bc8 23.Qh4+ Nh7 24.Bxg6 Bf5 25.Qxh7# 22.-Qc8 23.Qh4+ Nh7 24.Bxg7 Qh3 25.Qxh3 - Black can escape over 21.-f5 22.Ng6+ hxg6 23.g4 g5 24.Qh3 Rf6 25.Bxg5 Rxe6 26.dxe6 Bxg5 27.dxc7 Qxc7 28.gxf5 could be draw
Feb-24-21  Walter Glattke: Oh, wrong number, I mean 19.-f5 instead 19.- Rfd8, all moves 2 numbers back, I apologize.
Feb-24-21
Premium Chessgames Member
  agb2002: Level 2: 36.?
Short vs Bacrot, 2000


click for larger view

Feb-24-21  Brenin: I got 20 Ng6+ hxg6 21 Qg4 Nf8 22 Bf7 back in January, I got it again today, and no doubt I'll get it in March if and when it comes round again. I don't know what is going on at CG (illness, overwork, or whatever), but there must be many of us (myself included) who would be glad to lend a hand in selecting good unused positions for POTD, provided some suitable process could be set up.
Feb-24-21  Pedro Fernandez: Variation I: 20. Qh5 g6 21. Nxg6+ Kg7 22. Nxe7 Nf8 23. Qf7+ Kh8 24.Qg8 mate.

Var.2: 20. Qh5 h6 21. Ng6+ Kh7 22. Nxe7 Kh8 23. Bxh6 Nf8 24. Bxg7+ Kxg7 25. Nf5 mate.

Total: about five minutes. (At 3:38 a.m. ET)

Feb-24-21  saturn2: In <agb2002>s puzzle I had like in the game 36.Bxg7Qxg7 (otherwise comes f6) 37.Rg6 Qe7 (or other queenmoves except Qc7) but instead of 38.Rh6+ I took 38.Qg4 followed by Qh5.
Feb-24-21
Premium Chessgames Member
  chrisowen: Carabus ivorys washed it ok um ng6 hubbub evolve abattoir blacks against i verdicts quashers qh5 genius acrids muddle evolve carbohydrates ivorys gadfly quicks fitwhips mellow it ok um evolve joyfulness vuze its yarns veston gackus boundhome quick with finish clued it ok huffle evolve guffaws quicker evolve flicks dakars focums huddle qh5 couple ng6+ duck?
Feb-24-21  rubato: now they have changed the puzzle
Feb-24-21  mel gibson: <Feb-24-21 rubato: now they have changed the puzzle>

yes - and it's here:

Dlugy vs Zsofia Polgar, 1987

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