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Yadira Hernandez Guerrero vs Yu-Tong Elaine Lin
Dresden Olympiad (Women) (2008), Dresden GER, rd 5, Nov-17
Indian Game: Knights Variation. General (A46)  ·  1-0



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sac: 31.R1xd7 PGN: download | view | print Help: general | java-troubleshooting

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Premium Chessgames Member
  patzer2: I went with 31. R1xd7 (mate-in-12, Stockfish 9), but as <Walter Glattke> observes 31. R8xd7 +- (+26.88 @ 30 ply, Stockfish 9) also wins.
Premium Chessgames Member
  thegoodanarchist: I failed to solve the puzzle.

I found 31.R1xd7, followed by 32.Qxf7+.

But instead of 33.Qg7#, I played the "greedy" 33.Qxh7#

Aug-28-18  Mayankk: Not really a puzzle, is it? Just the standard capture and mate later in a simple sequence.

Even ‘easy’ puzzles should have a puzzling element to them. For example a few candidate moves which seem tempting or a sacrifice which is not too obvious.

Premium Chessgames Member
  whiteshark: [BlackElo "1487"]
Premium Chessgames Member
  perfidious: Why on earth is this posted as a puzzle? A novice could 'solve' this without difficulty.
Premium Chessgames Member
  Once: Folks, I think this is CG getting back to "normal". For the first time since we lost Daniel, we've got a wholly new POTD and not one recycled from a couple of months ago.

So sure the puzzle is a little iffy but I think we should cut Sargon a bit of slack as he gets the site back on its feet.

Aug-28-18  cormier:

click for larger view

Analysis by Houdini 4
12...f6 13.dxc5 Bxc5 14.Bd2 a5 15.Nd4 Ra6 16.Rad1 Rd6 17.Nb3 b6 18.c4 Nb4 19.Qe2 Nc6 20.Bxc6 Rxc6 21.Bxa5 Qe7 22.Bc3 e5 23.Qe4 Rc7 24.Nxc5 Qxc5 25.b3 Bb7 26.Qe3 Ra8 27.Qxc5 bxc5 + / = (0.58) Depth: 22

Aug-28-18  cormier:

click for larger view

Analysis by Houdini 4
9...Be7 10.dxc5 Bxc5 11.a4 a5 12.e5 Nfd7 13.Nb3 Be7 14.Re1 h6 15.Nbd4 Nc5 16.Nb5 Bd7 17.Nfd4 h5 18.b3 h4 19.Be3 Be8 20.Rad1 Rc8 21.Bf4 Bxb5 22.Nxb5 Nbd7 23.Be3 Rc6 24.g4 Re8 + / = (0.52) Depth: 22

Aug-28-18  cormier:

click for larger view

Analysis by Houdini 4: d 22 dpa done

1. = (0.01): 8...b6 9.e4 cxd4 10.exd5 d3 11.Qxd3 exd5 12.Nb3 h6 13.Re1 Nc5 14.Nxc5 bxc5 15.c4 Ba6 16.b3 Rb8 17.Ne5 Qc7 18.Bb2 Rfe8 19.f4 d4 20.Nc6 Rxe1+ 21.Rxe1 Rb6 22.Ne5 Bxe5 23.fxe5 Ng4 24.Bd5 Nxe5 25.Qf5

2. = (0.07): 8...cxd4 9.Nxd4 Re8 10.e4 Nc5 11.exd5 exd5 12.N2b3 b6 13.Nxc5 bxc5 14.Nf5 Bxf5 15.Qxf5 Rb8 16.Qc2 Re5 17.Be3 Qb6 18.b3 d4 19.Bf4 Rh5 20.Bc1 Qa6 21.cxd4 cxd4 22.Rd1 Rc5 23.Qd3 Qxd3 24.Rxd3

Premium Chessgames Member
  OrangeTulip: Complaining as second nature, one has to deal with that. Obviously it is a puzzle. (Okay 1,5 stars only) With which rook to take?
Aug-29-18  swclark25: I saw R1xd7, but what if Black went with 31...Qxd7 then 32.Rxd7 Rf8. What would White do for move 33?
May-10-21  Nullifidian: 31. ♖1xd7 wins the bishop outright and the queen will have to be given up if black wants to continue the game, because ♖f8 can't defend if the rook is pinned along the eighth rank.

After 31... ♕xd7 32. ♖xd7 ♖f8, 33. ♗e4 threatening the sacrificial 34. ♗xg6! is an interesting continuation. Black will be forced to capture with 34... ♙hxg6 and after 35. ♖d4 nothing black can do will stop ♖h4 and ♖h8#.

May-10-21  Walter Glattke: 31.Rcxd7 Qxd7 32.Rxd7 Rf8 33.Bxb7 Rb8 34.c6 axb4 35.axb4 e5 36.c7 Rxb7 37.c8Q Rxd7 38.Qxd7 e4 39.Qdd4 mate next. Another Glattke comment Aug 28, 2018
May-10-21  Walter Glattke: Correction: 31.Rd8xd7, not Rcxd7
Premium Chessgames Member
  drollere: 21. R1xd7, and .. Rf8 or Rxd8 fail to 22. Qxf7+ and mate next. 31. .. Qxd7, 32. Rxd7 Rf8, 33. Bxb7 Rab8, 34. b5 wins Q for R and white has two linked passed Qside pawns.
May-10-21  mel gibson: Very easy but it still took me 5 seconds to see it all.

Stockfish 13 says:

31. R1xd7

(31. R1xd7
(♖d1xd7 ♕a4xd7 ♖d8xd7 ♖e8-f8 ♗g2xb7 a5xb4 ♗b7xa8 b4xa3 c5-c6 a3-a2 c6-c7 a2-a1♕+ ♕f6xa1 e6-e5 ♕a1xe5 f7-f6 c7-c8♕ ♖f8xc8 ♗a8-d5+ ♔g8-f8 ♕e5-e7+) +M11/79 44)

White wins - mate in 11.

Premium Chessgames Member
  agb2002: Level 1: 25... ?
D Gurevich vs Adams, 1993

click for larger view

May-10-21  Brenin: The Black B on d7 is en prise, and the only puzzle here is which White R should capture it. Clearly 31 R1xd7 is strongest, nullifying the defence 31 ... Rf8 against 32 Qxf7+ and 33 Qg7 mate, and thus forcing Black to concede more material.
May-10-21  Brenin: Black's goose was cooked with 25 ... Re8, after Which white needed only to make natural attacking moves to develop an overwhelming position (for example, c6 will cause Black's position to collapse). Instead, 25 ... Rd8 and 26 ... Ng6 would have kept Black alive, though only just.
May-10-21  TheaN: <31.R1xd7 +-> however, I missed the simple 31....Rf8 32.Qxf7+! with mate in one. After 31....Rf8 I intended 32.Rxa8, but after 32....Qxd7 White 'just' wins the piece. It's dead won, but not as fast.
May-10-21  AlicesKnight: R1xd7 followed by puzzling over what I might have missed.....
Premium Chessgames Member
  Messiah: Black's entire set of ideas is deeply questionable in this game.
May-10-21  goodevans: <Aug-28-18 Once: Folks, I think this is CG getting back to "normal" [...] a wholly new POTD and not one recycled from a couple of months ago.>

Unfortunately the <new "normal"> seems to be frequent recycling of puzzles. At least today, unlike yesterday, they got the day right although quite why someone would think this lame offering was worth a second outing beats me.

I've no idea by what mechanism the daily puzzles are chosen. I know other kibitzers have offered to help in the past to try to re-establish their quality and I'd be happy to throw my hat into the ring in that respect.

Premium Chessgames Member
  Teyss: <agb2002> Thank you for this real Monday puzzle. And in general many thanks for your extra puzzles and all your analyses. Certainly I am not the only one to appreciate your valuable input.
Premium Chessgames Member
  agb2002: <Teyss> Thanks to you!
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