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Jindrich Trapl vs Vlastimil Jansa
Namestovo (1987), Namestovo CSR, rd 2
Gruenfeld Defense: Three Knights Variation (D90)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Jan-15-18
Premium Chessgames Member
  Phony Benoni: The continuation is obvious enough: 33.Rxe7+ Kxe7 34.Nf5+ with a winning fork. But the real point is that every king move allows White to capture the queen with check, thus avoiding back rank mate.
Jan-15-18  Patriot: Just as <Phony Benoni> said. It helps to take stock of the position before calculating.
Jan-15-18
Premium Chessgames Member
  patzer2: For today's Monday puzzle (33. ?), 33. Rxe7+ Kxe7 34. Nf5+ +- is an obvious winning knight fork.

What's not so obvious is the forced mate after 34...Ke8 35. Nxd6+ +- (mate-in-17, Stockfish 8 @ 26 ply).

P.S.: Black's decisive error was 30...Ke8? allowing 31. Qg8+ +- (mate-in-30, Stockfish 8). Instead, 30...Qd6 = (0.00 @ 36 ply, Stockfish 8) holds the position.

Jan-15-18  lost in space: Nothing to add what <PB> said
Jan-15-18  diagonalley: nothing to add what <lost in space> said
Jan-15-18  stst: Back to Mondy for MLK...R-sac in order:
33.Rxe7+ KxR (if Kd8, 34.QxQ#)
34.Nf5+ forks K,R Kd8/d7/f8===>QxQ+
else if Ke8 ===> NxQ+ forsk and White got a slack move to raise at least one P to avoid back rank +.
Jan-15-18
Premium Chessgames Member
  FSR: I like 33.Rxe7+ Kxe7 34.Nf5+ and the queen drops <with check>.
Jan-15-18  ndg2: Not "very easy", just easy, because you have to see that the black queen falls with checkvat the ebd so there's no back rank mate.

Or maybe you didn't see that and just were "lucky". In this case it's "very easy" again, but for the wrong reasons.

Jan-15-18
Premium Chessgames Member
  agb2002: White has a knight and a pawn for a rook.

Black threatens Qxd5 and aims at White's back rank.

White can win the queen with check after 33.Rxe7+ Kxe7 (33... Kd8 34.Qxd6#) 34.Nf5+:

A) 34... Kd7(8) 35.Qxd6+ Ke8 36.Qe7#.

B) 34... Ke8 35.Nxd6+ Kd7(d8,e7) (35... Kf8 36.Qf7#) 36.Nxc8+ + - [Q+2P vs r].

C) 34... Kf8 35.Qxd6+ followed by h4 + - [Q+N+2P vs 2r].

Jan-15-18  notyetagm: <Phony Benoni: The continuation is obvious enough: 33.Rxe7+ Kxe7 34.Nf5+ with a winning fork. But the real point is that every king move allows White to capture the queen with check, thus avoiding back rank mate.>

Jansa must have missed that after ... ♔e7-e8 White does not capture the Black queen with the White queen but with the White knight -> <ZWISCHENSCHACH>.

(continuation)
... ♔e7-e8 ♘f5x♕d6++-


click for larger view

... ♔e7-e8 ♕d5x♕d6?? ♖c3-c1# <weak back rank>


click for larger view

Jan-15-18  Cheapo by the Dozen: Exactly what <Phony Benoni> said.

I can imagine a similar puzzle being an April Fool's Day trap.

Jan-15-18
Premium Chessgames Member
  Stonehenge: < ndg2: Not "very easy", just easy, because you have to see that the black queen falls with check so there's no back rank mate.

Or maybe you didn't see that and just were "lucky". In this case it's "very easy" again, but for the wrong reasons.>

Agreed, this is a Tuesday Puzzle.

Jan-15-18  AlicesKnight: The point is that after the R capture/sac and the N fork, the capture of the Black Q comes with check, giving a tempo to avoid back-rank mate. Oh - sorry, <Phony> said it earlier.
Jan-15-18  leRevenant: Good Monday POTD, chugging towards Tuesday.
Jan-15-18
Premium Chessgames Member
  Dionysius1: Hehe <ndg2>. I was just lucky.
Jan-15-18  jffun1958: 33. Rxe7+ and the queen can be forked or is lost.
Jan-15-18
Premium Chessgames Member
  morfishine: After <33.Re7+> 33...Kxe7 <34.Nf5+>, no matter where the Black King goes, the Black Queen is captured with check (negating back rank threats)

Chess is a cruel game

*****

Jan-15-18  mel gibson: Good one.

Stockfish 8 says mate in 18.

33. Rxe7+ (33. Rxe7+ (♖e1xe7+ ♔d7xe7 ♘h4-f5+ ♔e7-e8 ♘f5xd6+ ♔e8-e7 ♘d6-f5+ ♔e7-f8 ♕d5-d6+ ♔f8-f7 ♕d6-e7+ ♔f7-g6 ♘f5-h4+ ♔g6-g5 h2-h3 ♖c3xh3 g2xh3 ♔g5xh4 ♕e7xf6+ ♔h4-h5 ♕f6-f5+ ♔h5-h6 ♕f5xc8 ♔h6-g6 d4-d5 ♔g6-f6 d5-d6 a7-a6 d6-d7 ♔f6-e6 d7-d8♕+ ♔e6-e5 ♕c8-g4 b7-b6 ♕d8-d4+) +M18/59 102)

Jan-15-18  zb2cr: A little bit of a twist her. 33. Rxe7+, Kxe7; 34. Nf5+ forking the Black King and Queen is obvious enough. However, even more important is that for all four of Black's possible replies ( ... Kf8, ... Ke8, ... Kd7, and ... Kd8) White can capture the Queen with check. This frustrates Blck's possible back-rank shenanigans.
Jan-15-18
Premium Chessgames Member
  malt: Attraction 33.R:e7+ K:e7 34.Nf5+ Ke8
(34...Kf8 35.Q:d6+ )35.N:d6+
Jan-15-18
Premium Chessgames Member
  jith1207: It's awesome. With the back rank closed, it needs perfect alignment to make the move capturing of black queen a check as well. Just like the Minneapolis Miracle we just witnessed.
Jan-15-18
Premium Chessgames Member
  Willber G: <ndg2: Not "very easy", just easy, because you have to see that the black queen falls with checkvat the ebd so there's no back rank mate.

Or maybe you didn't see that and just were "lucky". In this case it's "very easy" again, but for the wrong reasons.>

:-)

Jan-15-18  cormier: 1) +0.14 (29 ply) 6.e4 Nxc3 7.bxc3 c5 8.Be3 O-O 9.Rc1 Qa5 10.Qd2 Nd7 11.Bd3 e5 12.d5 f5 13.Bg5 Nf6 14.c4 Qc7 15.Bxf6 Bxf6 16.O-O f4 17.h3 b6 18.Bc2 Bb7 19.Ba4 Qe7 20.Qc2 Rad8 21.Rfe1 h6 22.Red1 Kg7 23.Rb1

2) +0.08 (29 ply) 6.e3 O-O 7.Bc4 Nxc3 8.bxc3 c5 9.O-O Nc6 10.Ba3 b6 11.Qe2 Qc7 12.Rfd1 Bb7 13.dxc5 bxc5 14.Rab1 Na5 15.Ba6 Bxa6 16.Qxa6 Rab8 17.Rb5 Rfd8 18.Rc1 Rxb5 19.Qxb5 Rc8 20.Rb1 e6 21.Rc1 c4

3) +0.04 (29 ply) 6.g3 O-O 7.Bg2 c5 8.O-O Nc6 9.Nxd5 Qxd5 10.Be3 Qh5 11.d5 Rd8 12.dxc6 Rxd1 13.Rfxd1 h6 14.Rd8+ Kh7 15.Rc1 bxc6 16.Rxc5 Qg4 17.b3 Bb7 18.Rxa8 Bxa8 19.Ra5 Qd7 20.Rxa7 Bb7 21.Nd2 Qc8 22.a3 e6

4) =0.00 (29 ply) 6.h3 c5 7.e4 Nxc3 8.bxc3 O-O 9.Be3 Nc6 10.Rc1 cxd4 11.cxd4 Qa5+ 12.Bd2 Qxa2 13.Bc4 Qa3 14.Be3 Qb4+ 15.Bd2 Qa3

5) -0.14 (29 ply) 6.Bg5 c5

15.0 minute analysis by Stockfish 8

Jan-15-18  cormier: 1) =0.00 (38 ply) 6...Nxc3 7.bxc3 O-O 8.Qa3 Bg4 9.e4 Bxf3 10.gxf3 e5 11.d5 Nd7 12.h4 Nf6 13.Rb1 c6 14.c4 b6 15.Bg5 h6 16.Bxf6 Bxf6 17.h5 Bg5 18.Rd1 Qf6 19.d6 Rfd8 20.hxg6 fxg6 21.c5 bxc5 22.Qxc5 Qxf3 23.Qc4+ Qf7 24.Qc5 Qf3

60.0 minute analysis by Stockfish 8

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