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Tibor Tolnai vs Zoltan Gyimesi
Hungary (1993), rd 5
Spanish Game: Open Variations. Main Lines (C80)  ·  0-1

ANALYSIS [x]

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sac: 35...Rxh3+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
Feb-15-18  JJF: After 38 ...f5+. 39. Qxf5+ Qxf5+ 40. Kf3 and white seems to still have life.
Feb-15-18  EIDorado: I must agree with PefigorSinbulon: " 36.gxh3 Rb2+ 37.Kg3! White is safe."
Feb-15-18  Ian McGarrett: If after 35... Rxh3, White plays gxh3, some are suggesting Rb2+ but that fails to Kg3. The white king is running to h4. The correct line is 36... Qd2+, 37.Re2 (if the queen interposes on g2, black takes the pawn at f4 with mate to follow shortly, and if white plays Kg3, then Rb3 leads to a quick mate) 37... Qxe2, 38.Qg2, where Black is up a pawn with a raging attack - For instance, 38... Qe3 hits the rook on a7 and the pawn on f4, 39.Ra4 seems forced because of the double threat and then Black plays 39... Qc1, keeping an eye on the f4 pawn and threatening Rb2 winning white's queen. If now 40.Re4 (so as to interpose on e2) then 40...Rb2, 41.Re2 Qxf4+ and white will lose his queen. To make a long story short... this is not so easy a position to solve as the comments imply and there are actually ways for Black to go wrong even after finding the initial move.
Feb-15-18  diagonalley: recapturing the black rook with white's KNP still wins... (but it's a deal more protracted)
Feb-15-18  EIDorado: @Ian McGarett thanks for clarification!
Feb-15-18  yadasampati: <Phony Benoni> I have to admit that i am guilty ... The position somehow tricked me into thinking that it was white's move. So i failed the simple task of properly reading the puzzle title :-)
Feb-15-18  mel gibson: I saw the first move but I wasn't sure.

Stockfish 8 says mate in 38:

35. Kh2 Rxh3+

(35. .. Rxh3+ (♖h7xh3+
g2xh3 ♕d6-d2+ ♖e7-e2 ♕d2xe2+ ♕g5-g2 ♕e2-e3 ♖a7-a4 ♕e3-c1 ♖a4-e4 f7-f5 ♖e4-a4 ♖b1-b2 ♖a4-a8+ ♔f8-g7 ♕g2xb2+ ♕c1xb2+ ♔h2-g3 ♕b2-c3+ ♔g3-g2 ♕c3-d2+ ♔g2-f3 ♕d2-d3+ ♔f3-f2 ♕d3-d4+ ♔f2-f3 ♕d4-e4+ ♔f3-g3 ♕e4-e3+ ♔g3-g2 ♕e3xf4 ♖a8-a7+ ♔g7-h6 ♖a7-a2 ♕f4-e4+ ♔g2-h2 f5-f4 ♖a2-f2 ♕e4-e3 ♔h2-g2 ♕e3-g3+ ♔g2-f1 f4-f3 ♖f2-d2 ♕g3-f4 ♖d2-c2 ♕f4-d4 ♔f1-e1 ♕d4-e3+ ♔e1-f1 ♕e3-d3+ ♔f1-f2 ♕d3xc2+ ♔f2xf3 ♕c2-d3+ ♔f3-f2 ♕d3-d2+ ♔f2-f3 c6-c5 h3-h4 c5-c4 ♔f3-e4 c4-c3 h4-h5 c3-c2 ♔e4-f3 c2-c1♕) +M38/45 205)

Feb-15-18  cocker: Good ol' <dzechiel> said it all, all those years ago.
Feb-15-18
Premium Chessgames Member
  agb2002: The material is identical.

Black can attack the white king with 35... Rxh3+:

A) 36.gxh3 Qd2+

A.1) 37.Qg2 Qxf4+ 38.Qg3 Rb2+ 39.Kh1 (39.Kg1 Qxg3+ and mate next) 39... Qf1+ 40.Qg1 Qxh3+ 41.Qh2 Qxh2#.

A.2) 37.Kg3 Rb3+

A.2.a) 38.Kh4 Qf2+ 39.Kg4 f5+ 40.Qxf5+ gxf5+ 41.Kxf5 Rb5+ 42.Kg6 (42.Kf6 Qxf4+ wins; 42.Ke4 Qe2+ 43.Kd4 Qxe7 wins; 42.Kg4 Qg2+ 43.Kh4 Qg6 wins) 42... Qg3+ wins.

A.2.b) 38.Kg4 f5+ as above.

B) 36.Kxh3 Rh1+ (36... Qd3+ 37.Kh2)

B.1) 37.Kg3 Qd3+

B.1.a) 38.Kf2 Rf1#.

B.1.b) 38.Kg4 f5+ 39.Qxf5+ Qxf5+ wins.

B.1.c) 38.Re3 Qxe3+ 39.Kg4 f5+ as above.

B.2) 37.Kg4 Qd1+ (37... f5+ 38.Kf3 -38.Kg3 Qd3+ and mate next- 38... Qd3+ 39.Re3 Rf1+ 40.Kg3 Qxe3+ 41.Kh2 -41.Kh4 Rh1#- 41... Qg1+ 42.Kg3 Qe3+ repeats moves) 38.Kg3 Qd3+ transposes to B.1.

Feb-15-18
Premium Chessgames Member
  agb2002: Reminded me of Bronstein vs Korchnoi, 1962
Feb-15-18
Premium Chessgames Member
  whiteshark: <agb2002> #Metoo
Feb-15-18  gofer: Well, there seem to be rather a lot of losing moves...

35 ... Rh5?
36 Rxf7+ Ke8
37 Rae7+ Kd8
38 Rd7++ Kc8/Ke8
39 Qc8#

35 ... f6?
36 Rxh7 mating

36 ... Qd5?
37 Ra8 Kg7
38 Rxf7+ Kxf7
39 Ra7+ Ke8 (Ke7 Qxg6# or Kf8 Qf6+ mating or Kg8 Qxg6+ mating) 40 Qxg6+ Rf7
41 Qg8+ Rf8
42 Ra8+ Kd7 (Ke7 Qxf8+ +-)
43 Qxd5+ cxd5
44 Rxf8 +-

So, that only really leaves Rb5 and Rxh3+

<35 ... Rxh3+>

36 Kxh3 Rh1+
37 Kg3 Qd3+ mating (Kg4 f5+ +-)

36 gxh3 Qd2+

37 Qg2 Qxf4+!
38 Qg3 Ra2+ mating

37 Kg3 Rb3+
38 Kg4 Qg2+ (Kh4 Qf2+ mating as below)
39 Kh4 Qf2+
40 Kg4 Rg3+
41 Kh4 Rg2+
42 Qg3 Qxg3#

Okay. No need to look at Rb5...

~~~

Okay, I missed 37 Re2 which makes it take a lot longer...

Feb-15-18
Premium Chessgames Member
  thegoodanarchist: Wednesday-level difficulty on this Thursday.
Feb-15-18
Premium Chessgames Member
  patzer2: Joining the chess analysis me too movement, I also thought it was White to move in today's Thursday puzzle and picked 35. Rad7 +- (+79.99 @ 20 depth, Fritz 15) as my solution.

Once I looked at the game and saw it was Black to move, 35...Rxh3+! was where I restarted my analysis. I found the predictable continuation 36. Kxh3 Rh1+ 37. Kg3 Qd3+ +- easy enough, and realized White's resignation was fully justified in lieu of 38. Kg4 f5+ -+.

The move I found difficult was 36. gxh3 as my blitz reaction first thought of 36...Rb2+?? throws away the win and loses. White turns the tables and mates Black in ten moves after 36.gxh3 Rb2+?? with 37.Kg3 Rb3+ 38.Kh4 Kg8 39.Rad7 Qxd7 40.Rxd7 Rb8 41.Qf6 Rf8 42.f5 gxf5 43.Kg5 Kh7 44.Qh6+ Kg8 45.Kf6 Re8 46.Qg7# (M10, Stockfish 8 @ 55 ply).

After realizing 36. gxh3 36...Rb2+?? is bad for Black, I turned my attention to 36...Qd2+! and saw that it worked.

After 36. gxh3 Qd2+! 37. Qg2 (37. Re2 Qxe2+ 38. Qg2 Qe3! 39. Ra4 Qc1 40. f5 Rb2 -+), Black has mate-in-six with 37...Qxf4+ 38.Qg3 Rb2+ 39.Re2 Rxe2+ 40.Kh1 Qf1+ 41.Qg1 Qxh3+ 42.Qh2 Qxh2#.

P.S.: White's decisive mistake was 34. f4??, allowing 34...Rb1+ -+ (-22.91 @ 30 ply, Stockfish 8). Instead, 34. g3 ⩲ (+0.67 @ 36 ply, Stockfish 8) leaves White in good shape.

Feb-15-18  lentil: I think after [[ 35 ... Rxh3+ 36 Kxh3 Rh1+ 37 Kg3 Qd3+ 38 Kg4 ]] ... f5+ 39 Qxf5, then instead of ... Qxf5+, the simplest is ... gf+ 40 Kg5 Qd8!, which collects the W rooks for the Q and leaves B a rook up (41 Kf6 Rh6+)
Feb-15-18  njchess: A bit easy for Thursday. Despite White's rooks lined up menacingly on the 7th row, he has no real attack. However, if Black is to win, he must do something forceful, or else he will leave an opening for White. 35. ... ♖xh3+ with mate in 3 or 4 no matter what White does.
Feb-15-18  BOSTER: Something like this played Korchnoy with sac on h6.
Feb-15-18  AlicesKnight: 35....Rxh3+ looks like the try; 36.Kxh3 (forced) Rh1+; 37.Kg4 Qd1+; 38.Kg3 Qd3+; 39.Kg4 (Kf2 Rf1#) ...f5+ and the White Q goes with a check not allowing any hint of perpetual. Let's see - close enough.
Feb-15-18  morfishine: Going over the entire game, one could almost have sympathy for White. He was the aggressor displaying some nifty tactics, but then Black stabilizes positionally, possibly lulling White into a false sense of security who doubles his rooks on the 7th rank and has his Queen aggressively posted.

But all this ends rudely with splat <35.Rxh3+>

Chess is a cruel game

*****

Feb-15-18  stst: Easy but many variations:
Main Line...R-sac:
35......Rxh3+
(0)if
gxR Qd2+
Kg3 Rg1+
Kh4 Qf2+
Qg3 QxQ#

(A)
36.KxR Rh1+
37.Kg3 Qd3+
(A1) Kf2 Rf1#
(A2) Kg4 Qh3#

(B)
36.Kg4 f5+
(B1)
37.Qxf5 gxQ
38.Rf7+ (White's short tempo?!) Kg8
39.Rf7+ Kh8
... out of checks

(B2)
37.Kf3 Qd3+
38.Re3 Rf1+
39.Kg3 QxR+
40.Kh2 Qg1+
41.Kh3 Rf3+
42.Kh4 Qh2
... to delay
43.Qg3 RxQ or Qh1#

A tedious typing exercise... see which line game prefers...

Feb-15-18  stst: game picks my (B2), then... too lazy to do the typing exercise!!
Feb-15-18  stst: typo... game picks my (A) ... the simplest one...
Feb-15-18
Premium Chessgames Member
  landshark: I chose 36.... Qd3+. Seems to win outright in all variations. Game continuation more Grandmaster-ly. Nice quick kO!
Feb-15-18  drollere: <Easy but many variations:

(A)
36.KxR Rh1+
37.Kg3 Qd3+
(A1) Kf2 Rf1#
(A2) Kg4 Qh3#>

38. Qh3+; 39. pxh3. better is 38. f5

Feb-15-18
Premium Chessgames Member
  landshark: JJF: I believe you meant after 37 ...f5+, 38. Qxf5+ Qxf5+ 39. Kf3 and white seems to still have life - ?

Black needs to interpose 37.... Qd1+! first. Then 38. Kg3, Qd3+ is the game position where he resigned and 38. Re2, Qxe2+, 39. Kg3, Qe3+, 40. Kg4, f5+ is completely winning

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