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Henrique Mecking vs Lian-Ann Tan
Petropolis Interzonal (1973), Petropolis BRA, rd 4, Jul-28
English Opening: King's English. Four Knights Variation Fianchetto Lines (A29)  ·  1-0

ANALYSIS [x]

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sac: 25.Bxf7+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Apr-09-05  aw1988: What do you mean, g4 gives nothing? It is a winning move, like many others in this position.
Apr-09-05
Premium Chessgames Member
  samvega: I think point was merely that 33..K moves 34.g4 Rd4+ 35.K moves Rxg4.
Apr-09-05  aw1988: Oh. Erm, true enough, and now I wonder why anyone would play g4, if they are not playing with the opponent.
May-29-07  srinivas6195: i think that mecking might have planned bishop f7 from move number 23 thats why tan played rd8 then bishop c4 queen takes pawn but if black had analysed the idea of bishop f7 from first then why did he take that white pawn on c3 .
May-29-07  srinivas6195: might be tan over looked bishop f7
Sep-06-10
Premium Chessgames Member
  perfidious: Black overlooked a neat trick here; if he'd played simply 24....Bxd3 25.Bd3 Rxd3, he would have had no problems, but greed cometh before a fall.
Mar-14-14  SpiritedReposte: 25. ? White to play.
Mar-25-21
Premium Chessgames Member
  opus: 25. Rxc7 Qe1+ 26. Kg2 Re8 27. Bxf7#
Mar-25-21  Walter Glattke: A) 25.Bxf7+ Kxf7 26.Qh7+ Kd6 27.Rxc7 Qe4+ draw B) 25.Rxc7 Qe1+ 26.Kg2 Qe2+ draw C) 25.Bxf7+ Kxf7 26.Rxc7+ Qxc7 27.Qh7+ Ke8 28.Qxc7 Bxd3 29.Qxa7++-D) 25.Qf4 wins 1 P
Mar-25-21  saturn2: 3 checks with rather forced replies.
25.Bxf7 Kxf7 26.Rxc7 Qxc7 27.Qh7 Ke6 28.Qxc7
and soon a passer on the a file. I fekt free to stop here.
Mar-25-21
Premium Chessgames Member
  agb2002: Black threatens Qe1+ with perpetual check at least.

White can force a fatal alignment of Black's royal family on its second rank with 25.Bxf7+ Kxf7 26.Rxc7+ Qxc7 27.Qh7+ and 28.Qxc7, winning decisive material. For example, 27... Kf6 28.Qxc7 Rd7 29.Qc3+ Kf7 30.d4 + - [Q+2P vs r+b].

Mar-25-21
Premium Chessgames Member
  FSR: Jacob Aagaard says that when one has several promising-looking moves and they don't work in one move order, one should try them in different move orders. Here, 25.Bxf7+ Kxf7 26.Qh7+ Qg7 27.Rxc7+ Rd7 gives nothing. 25.Rxc7 Qe1+ at least draws by perpetual. But 25.Bxf7+! Kxf7 26.Rxc7+! Qxc7 27.Qh7+ wins.
Mar-25-21  AlicesKnight: I saw the game line but was not sure if any sort of fortress could be formed by Black keeping the a-pawn (e.g. 28 ... Rd7). Evidently not.
Mar-25-21  Brenin: The B+R double sacrifice was rather easy for a Thursday: there wasn't much else on, and as <FSR> points out, it was simply a matter of getting the moves in the right order (unlike for Eric Morecambe, playing the piano for conductor Andre Previn -- google them you've not seen this sketch). As SF notes, Black grabbed the wrong pawn on move 24.
Mar-25-21
Premium Chessgames Member
  eternaloptimist: I figured 25.♗xf7+ had to be the 1st move in this puzzle but it took me several minutes to see the skewer. Once I saw the skewer then I knew that I had solved it correctly
Mar-25-21  mel gibson: That wasn't too hard.

Stockfish 13 says:

25. Bxf7+

(♗c4xf7+ ♔g8xf7 ♖b7xc7+
♕c3xc7 ♕h6-h7+ ♔f7-f8 ♕h7xc7 ♖d8xd3 ♕c7xa7 ♗f5-d7 ♕a7-f2+ ♔f8-g8 ♕f2-b6 ♔g8-f7 ♕b6-b7 ♖d3-d1+ ♔g1-f2 ♔f7-e8 ♕b7-b8+ ♔e8-e7 ♕b8-e5+ ♔e7-f7 ♕e5-f4+ ♔f7-e7 ♕f4-e3+ ♔e7-d8 ♕e3-b6+ ♔d8-c8 ♕b6-c5+ ♔c8-b8 ♕c5-e5+ ♔b8-c8 ♕e5-f4 ♗d7-f5 ♕f4-c4+ ♔c8-d8 g3-g4 ♗f5-d7 ♕c4-c5 ♗d7xg4 ♕c5-g5+ ♔d8-c7 ♕g5xg4 ♖d1-d2+ ♔f2-e3 ♖d2-d6 ♕g4-c4+ ♔c7-d7 a2-a4 ♖d6-c6) +5.51/37 212)

score for White +5.51 depth 37

I also ran it at 2 seconds per move on autoplay - White ended up with 2 Queens and won easily.

Mar-25-21
Premium Chessgames Member
  pittpanther: I also thought black could put up more resistance by playing 28....Rd7 and keeping the a pawn. White is still winning but needs more technique to win the game.
Mar-25-21  et1: Samba ! :)
Mar-25-21
Premium Chessgames Member
  WorstPlayerEver: Very easy ch ch ch hard to miss for a superpatzer.
Mar-25-21
Premium Chessgames Member
  chrisowen: Luge keys i Bxf7+ hubby it a flush keys as photon beam cabs it wobbles keys lugs wristy keys i hm clung it wobble quicks quacks oaks jekyll jeffrey proved its yes keys dither lung keys hike warble cams Qxc3 flushy abridged keys i axled it a gourdy quodus a keys i Bxd3 goofball abracadabra min o mob it a hub rib key i addups ignoble fab it ignoble cervix it cowsbell Bxf7+ effect;
Mar-25-21
Premium Chessgames Member
  drollere: i am less sanguine about the puzzle "solution" than the rest. Q+p vs. R+B is not an easy ending to win (at least for me).
Mar-25-21
Premium Chessgames Member
  mjmorri: I miss the days when players like Tan could participate in these kinds of tournaments.
Mar-25-21  RandomVisitor: <perfidious> from 2010 points out that black has 24...Bxd3 and at least an even game:


click for larger view

Stockfish_21031920_x64_modern:

<53/65 11:33 -0.12 24. ... Bxd3 25.Bxd3 Qf3 26.Rb2 Qxd3> 27.Qg5 Re8 28.Qf6 a5 29.Rf2 Qd5 30.Qf3 Qxf3 31.Rxf3 Re1+ 32.Kg2 Ra1 33.Rf2 Rc1 34.h4 Rxc3

Mar-25-21  RandomVisitor: Earlier black had 14...Bg4 for a nice advantage:


click for larger view

Stockfish_21031920_x64_modern:

<56/78 2:00:54 -0.99 15.Qc2 Nd7 16.f5 c6> 17.Rf4 Nf6 18.Rxb7 Qc8 19.Rb2 h5 20.Bg2 Bxf5 21.Rf1 Bg6 22.Bf4 Qa6 23.Qd2 Re6 24.Rf3 Rae8 25.Re3 Kh7

Mar-25-21  TheaN: Took way too long wanting Bxf7+ with Qh7+ to work. Only once I realized it's really bad I noticed to switch the moves (as I saw Rxc7 had potential but not without check).
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