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Andras Adorjan vs Jonathan Tisdall
Edward Lasker Memorial (1981), New York, NY USA, rd 5, Apr-??
Tarrasch Defense: Swedish Variation, Central Break (D33)  ·  1-0



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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
Feb-27-14  estrick: According to Schiller,

"This game created quite a stir when it was played, both because of the beauty of the finish and in addition the important alternative analyzed by Adorjan after the game."

Feb-28-14  estrick: CG evidently picked the exact point in the game for its 2008 Ground Hog's Day POTD, when Black blundered his chance for maintaining equality.

17. ...a6 was a grave mistake. My version of Fritz evaluates the position as +1.63 in favor of White after that move.

If instead Black had played, 17. ...h6, the evaluation was 0.00 at 21 ply.

18. Nb5 bxc6
19. Bxc6 Rb8
20. Bf4 Rxb5
21. Bxb5 a6
22. Bc6 Bb7
23. Rd7 Qe6
24. Rd6 Qe7

Dec-23-17  Cheapo by the Dozen: Seeing the following was straightforward:

-- If Black's bishop stops defending d8, bad things could happen to him. -- If Black's bishop goes to c7 at the wrong time, cb is bad for him. -- White can harass Black's dark-squared bishop. -- 18 b4 is the obvious way to start harassing Black's bishop, especially since 18 b4 cb 19 Nxb3 unblocks the d-file while harassing Black's bishop.

But that's as far as I got. I didn't calculate anything very convincing, and gave up quickly. (All this was after a bit of time not finding anything with the apparent potential pin of Black's queen; I didn't see any way to get his light-squared bishop out of the picture.)

Premium Chessgames Member
  An Englishman: Good Evening: Does 18.Nb3 (threatening 19.Nxa5 and 19.Bd5) give White any sort of advantage?
Premium Chessgames Member
  ChessHigherCat: <An Englishman: Good Evening: Does 18.Nb3 (threatening 19.Nxa5 and 19.Bd5) give White any sort of advantage?> Unfortunately Bd5 isn't a threat unless you keep the N on d5 to prevent Be6, in which case the R doesn't support Bd5 (Catch-22). So how to deflect the blankety-blank LSB? If 18. cxb7 Bxb7 is forced, 19. Nc6 hitting the B on a5 and finally threatening Bd5. If 19....Bxc6 20. Bxc6 hitting the rook and threatening the pin but then black has Rd8 (arghhhh...)
Premium Chessgames Member
  ChessHigherCat: My gourd, 18. b4 with a swindle in 19! Never would have seen that...
Dec-23-17  Walter Glattke: I think, 18.Ne2 (threatens Bd5) g6 19.cxb7 would win.
Dec-23-17  dannydoc: I really don't understand why Black gives up? The only winning move I see for White is not Nxb4, but Nd8.
Premium Chessgames Member
  agb2002: White has a rook and a knight for the queen.

The black queen and the lsb are tied to the defense of the pawn on b7 and the dsb stops an eventual Rd8+. These details suggest 18.b4:

A) 18... cxb3 19.Nxb3

A.1) 19... b6 20.Rd8+ Qf8 21.Bd5+ Kh8 22.Rxf8#.

A.2) 19... Bc7 20.cxb7 wins decisive material.

A.3) 19... bxc6 20.Nxa5 + - [R+B+N vs q+p].

A.4) 19... Qc7 20.Nxa5 Qxa5 21.cxb7 Bxb7 22.Bxb7 + - [R+B+N vs q+p].

B) 18... Bxb4 19.Rab1

B.1) 19... Ba5 20.cxb7 Bxb7 21.Rxb7 + - [R+B+N vs q+p].

B.2) 19... a5 20.Nb5

B.2.a) 20... bxc6 21.Rd8+ Bf8 22.Bxc6

B.2.a.i) 22... Rb8 23.Bd5 (23.Nd6 also looks winning) 23... Be6 24.Bxe6 Qxe6 25.Rxb8 + - [2R+N vs q+p].

B.2.a.ii) 22... Bb7 22.Rxa8

B.2.a.ii.1) 22... Bxa8 23.Bxa8 + - [R+B+N vs q+p] (23... Qe8 24.Bd5+).

B.2.a.ii.2) 22... Bxc6 23.Rc8 Bxb5 24.Rxb5 with threats Rbb8 and Bc5 looks winning.

B.2.b) 20... h6 21.Rd8+ Kh7 22.cxb7 Bxb7 23.Rxa8 Bxa8 24.Bxa8 + - [R+B+N vs q+p].

B.3) 19... Qe7 20.cxb7 Bxb7 21.Nf5 seems to win a piece for a pawn (21... Qe6 22.Bxb7 Rb8 23.Rxb4 Qxf5 24.Bf4 Re8 25.Rxc4).

Dec-23-17  Cheapo by the Dozen: Oh wait. Here's a line I missed.

18 b4 cb
19 Nxb3 Bb4
20 Rd8+ Bf8

isn't a defense, because of

21 cb Bxb7
22 Rxa8 Bxa8
23 Bxa8

Dec-23-17  malt: Looked at 18.cb7 B:b7 19.Nc6 which led nowhere then, 18.Nb3 cb3 19.Bd5 Be6

18.b4 B:b4 (18...cb3 19.N:b3) (18...Bb6)
19.Rab1 looks likely

Dec-23-17  patzer2: Black's decisive mistake was 17...a6?, allowing today's Saturday puzzle solution 18. b4!! +-.

The back rank weakness created by 17...a6? allows White to exploit it by way of 18. b4!! with the dual threats of (1) Rd8+ if the Bishop can be driven off the a5-d8 diagonal and (2) cxb7 if the Queen can be driven off the seventh rank.

With best play, Stockfish 8 indicates the overloaded Queen is eventually driven off the seventh rank and White wins a piece with the pawn fork cxb7:

18. b4!! Bb6 19. Nc2! Qc7 (not 19...Bxe3?? 20. Qd8+ +- exploiting the weak back rank) 20. Bd5+! Kh8 21. Bf4 Qe7 22. Re1 Qd8 23. Rad1! g5 24. cxb7 Bxb7 25. Bxb7 Bxf2+ 26. Kxf2 Qb6+ 27. Nd4 Qxb7 28. Bd2 Qd7 29. Bc3 +- (+2.85 @ 31 ply, Stockfish 8).

Instead of 17...a6? 18. b4!! +-, Black can avoid the back rank weakness and hold the position by giving the King an escape square with 17...h5 ⩲ to = (+0.29 @ 31 ply, Stockfish 8).

Dec-23-17  dumbgai: I spent the entire time trying to get some Bd5 move in that wins the queen (as long as black’s Be6 can be prevented). Totally missed it.
Dec-23-17  thegoodanarchist: Deck the Halls with Boughs of Holly

Falalalala Lalalala

<Tisdall> the Season to Be Jolly

Falalalala Lalalala

Dec-23-17  botvinnik64: Adorjan became (one of) my chess heroes in the 1980s. He used to play in the New York Open, a monstrously strong Open held around Easter at the Penta (now Pennsylvania?) Hotel across the street from Penn Station/MSG. Andras was always in or right on the lead. He was publishing Black is OK, one of the best chess books. Kasparov worked with him in his teens, I think.
Premium Chessgames Member
  transpose: The dark square bishop plays a vital defensive role and the other bishop must protect e6 after a possible Bd5 by white. With this evaluation of the position, I considered four candidate moves: three involved moving the knight and also b4. I concluded that b4 looked most promising, but I missed Rb1 after black takes the b4 pawn with his bishop because I did not see Bf8 defending after Rd8+. But as pointed out by others, this is not a defense as white wins an exchange.
Dec-23-17  schachfuchs: Could that 15.dxc6 even be a home cooked variation?
Premium Chessgames Member
  Jimfromprovidence: <Cheapo by the Dozen> <Oh wait. Here's a line I missed.>

<18 b4 cb
19 Nxb3 Bb4
20 Rd8+ Bf8

isn't a defense, because of

21 cb Bxb7
22 Rxa8 Bxa8
23 Bxa8>

Try 21 Bd5, below. It wins the queen.

click for larger view

Dec-23-17  WorstPlayerEver: I think 23. Nd8 is a bit of a missed opportunity, and no one will notice the difference. So it's time for cg to adjust this game a little.

click for larger view

Dec-23-17  WorstPlayerEver: PS funny enough the 18. b4 Bxb4/23. Nd8 line was alreadly mentioned by <stukkenjager> <13-02-08> in this thread. My apologies.
Dec-23-17  dhotts: Great puzzle!
Dec-23-17  jayfreeman: Two questions to black here:
1. What is the point of 17... a6?
2. And why 18... Bxb4 and not just Bb6?

these two moves are mistakes. it is rather difficult to solve the puzzle if you have to guess the mistakes as well ;))

Premium Chessgames Member
  agb2002: In my line B.2, 20.Nb5 seems to lose all the advantage (I had the impression that it was stronger than the natural 20.a3) after 20... bxc6 according to Stockfish.

In my line B.2.a.ii.2, 23.Rc8 is a blunder which loses to Qd5.

Better luck tomorrow.

Dec-23-17  morfishine: The key is to post your analysis without engine assistance and generate discussion that way.

Thats the point


Dec-23-17  tivrfoa: what is the sequence after 23. ... Qe8???

24. Bxa8 Qxa8

then Quen & bishop against 4 pieces

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