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Susanto Megaranto vs Oliver Barbosa
Asian Continental Chess Championship (2012), Ho Chi Minh VIE, rd 6, May-10
Queen Pawn Game: Symmetrical Variation (D02)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Jul-08-12  Marmot PFL: 54...e1(N)+ 55 Kh3 (Qxe1 Qxc2+) Re8 56 d6 Qf7 57 d7 Qh5+ 58 Qh4 Qf5+ 59 Qg4 Qf1+ 60 Kh4 g5+ with mate coming soon.
Jul-08-12  Marmot PFL: Others (besides 54...e1(N)+) I rejected as after 54...Qxc2 55 Qe6+ black has no way to escape checks and 54...e1(Q) seemed to contradict the spirit of recent puzzles.
Jul-08-12
Premium Chessgames Member
  chrisowen: Took aboard see apt aint it ne1+ pt i describe journying flight king

has h3 as bargain bolt hole game in so it be qe1 exf8q+ kxf8 qxe1

qxc2+ and it lope i know cold c3 c2 radiate for warmer shores in

clamp it light does best within dilemma 52.nxc3 getting rid of the

capital artist digs in bury it ticking along pc3 meeting qe4

fashionable at rookxc2 rxc2 e2 e7 spot of bother in.

Jul-08-12
Premium Chessgames Member
  chrisowen: Manage ring qxc2 alas this is overboard in so far it allow ground to sink qe6 which should draw in supporting e7 easy came knightf8 tree in as on articulate in g6 for king hidehole in repeto wall kin the plan ko it us in goods humbrage line SM it escry in him from qxc2 promote f8 lash in qxc2 if in correct it another cruising in rumbles terrific in e1n+ no rope left.
Jul-08-12  Memethecat: 54...e1=Q [54...e1=N+ 55.Kh3 leads nowhere] (54...exd1=Q 55.Qe6+ Kh7 56.exf8=N+ leads to draw by rep)

White has 2 reasonable replies:

1st: 55.exf8=Q+ Kxf8 56.Qxe1 Qxc2+ 57.Kh1 [57.Kh3,f1,f3 Qf5+ gives black tempi](57.Nf3 Bxf3 58.Qxf3 Qxf3+ 59.Kxf3 c2 & the black pawn will promote)

57...Qf5 (threatening Qf3#)

58.Kg2 (58.Qe2 Qxd5+ 59.Qg2 Qxg2+ 60.Kxg2 c2 & again the pawn promotes)

58...Qxd5+ 59.Kf1 c2.... I cant see any way for white to stop the pawn promoting except by giving up his own Q

* x * x * x * x * x * x

2nd: 55.Qxe1 Qxc2+ 56.Kh3 (56.Kh1 Rf1+ 57.Qxf1 Qe4+ 58.Qg2 Qe1+ 59.Qf1 Qxf1#)

56...Qf5+ 57.Kg2 (57.g4 Qf3+ 58.Qg3 Qf1+ 59.Qg2 Rf3+ 60.Kh4 Bf6+ 61.Kh5 Rh3+ 62.Qxh3 Qxh3+ 63.Kg6 Qxg4#)

57...Qxd5+ 58.Kh3

That's about as much as my brain can cope with on a wet & miserable Sunday afternoon, time to see where I blew it, even though really I don't give a @#$% either way.

Jul-08-12  master of defence: What happens after 54...exd1=Q?
Jul-08-12  LoveThatJoker: <54...e1=N+! 55. Kh3>

[55. Kh1?? Rf1#; 55. Qxe1 Qxc2+ 56. Kh1 (56. Kh3 Qf5+ 57. g4 - 57. Kg2 Qxd5+ ; 57. Kh4 Bf6# - 57...Qf3+ wins) 56...Re8 57. Ne3 (57. d6 Qf5 ; 57. Qe6+ Kh8 ) 57...Bxe3 58. Qxe3 Qd1+ 59. Kg2 Qd2+ 60. Qxd2 (60. else ) 60...cxd2 ]

<55...Re8!> and Black wins in all variations.

For example,

A) 56. Qe6+ Kh8 57. Qf7 [57. Re2 c2 ; 57. Rc1 Qa3 58. Rb1 (58. Nb2 cxb2 59. Rxe1 Qxe7! and Black wins) 58...c2 59. Rb8 Rxb8 60. e8=Q+ Rxe8 61. Qxe8+ Qf8 ] 57...Rxe7! 58. Qxe7 [58. Qf8+ Kh7 59. Qf5+ g6 60. Qf8 Nxc2 61. Qxe7+ Bg7 62. d6 Nd4 63. d7 Qxd1 64. d8=Q Qf1+ 65. Kh4 (65. Kg4 Qf5+ 66. Kh4 Nf3#) 65...Nf5+ wins] 58...Nxc2 59. Qe8+ Kh7 60. Qe4+ g6 61. Qe7+ Bg7 wins for Black as already shown.

B) 56. Rc1 Qa3! and Black wins as shown in line 'A'

LTJ

Jul-08-12  LoveThatJoker: Thank you, <Random Visitor>!!

As per RV's Rybka analysis on <54...e1=N+!>, I have scored the full point for today.

The key to winning with <54...e1=N+> is finding <55. Kh3 Re8!>, which I did!

I'm glad my hard work paid off for the full point today!

LTJ

PS. I finish my week with 7/7, and I'm on an 8 consecutive correct solve streak!

Jul-08-12  1stboard: Amazing the double error on move Black 54 / White 55 , reminds you of Keres / Fisher Curacao 1962 with the double error on move 56 ( Game # 37 from Fisher's book of 60 memorable games.

Blacks actual move I can understand, but white's was right there.

Perhaps there was time pressure on both sides ??

Jul-08-12  James D Flynn: Material is equal, pawns are close to queening on both sides, and both kings are under attack. Candidates 54Qxc2, e1=N+, exd1=Q. 54Qxc2 55.exf8=Q+ Kxf8 56.Qxc2 e1=N+ 57.Kf1 Nxc2 58.Ke2 Nb4 59. Nxc3 Bxc3 and Black, up a N and B, will easily win. 54..e1=N+ 55.Qxe1 Qxc2+ 56.Kh3(if 56.Nf2 Rxf2+ 57.Kh3 Rxh2+ 58.Kg4 Qg6+ 59.Kf4 Rf2+ 59.Qxf2 Bxf2 and Black has a winning material advantage) Qf5+ 57.g4 Qf3+ 58.Qg3 Qf1+ 59.Kh4 Bf6+ 60.g5 hxg5+ 61.Kh5 Qh7# 54.exd1=Q 55.Qe6+ Kh7 56.exf8=N+ Kh8 57.Ng6+ Kh7 58.Nf8+ and White has at least a perpetual.
Jul-08-12  waustad: I looked at the line they actually played, not the better one. A queen sac followed by an underpromotion was just too tempting to pass up.
Jul-08-12
Premium Chessgames Member
  agb2002: Black has a bishop for a knight.

White threatens 55.exf8=Q+ and 55.Q(R)xe2.

The prosaic 54... exd1=Q only seems to achieve draw at most after 55.Qe6+ Kh7 (55... Kh8 56.exf8=Q+ Kh7 57.Qfg8#; 55... Rf7 56.e8=Q+ Kh7 57.Qe4+ and mate soon) 56.exf8=N+ (56.exf8=Q Qxc2+ 57.Kh3 Qh5#) 56... Kh8 57.Ng6+ Kh7 58.Nf8+, etc.

Another option is 54... Qxc2:

A) 55.Qxc2 e1=N+ 56.Kh3 (56.Kh1 Rf1#) 56... Nxc2

A.1) 57.exf8=Q+ Kxf8 - + [B].

A.2) 57.d6 Kf7 58.exf8=Q+ Kxf8 - + [B].

B) 55.exf8=Q+ Kxf8

B.1) 56.Qxc2 transposes to A.

B.2) 56.Qf4+ Kg8 57.Qb8+ Kh7 wins.

C) 55.Qe6+ Kh7 (55... Rf7 56.e8=Q+ Kh7 57.Qe4+ Qxe4+ 58.Qxe4+ Kg8 59.Qxe2 + -) 56.exf8=N+ Kh8

C.1) 57.Ng6+ Qxg6 58.Qxg6 exd1=Q 59.Qe8+ Kh7 60.Qe4+ g6 61.Qe7+ Bg7 62.d6 c2 63.d7 c1=Q 64.d8=Q Qf1#.

C.2) 57.Nf2 e1=Q 58.Qxe1 Qxf2+ 59.Qxf2 Bxf2 60.Kxf2 c2 61.d6 c1=Q 62.d7 Qc5+ wins.

Jul-08-12  DarthStapler: I didn't get it
Jul-08-12  iqbalianpawn: <Richard Taylor> Nice post explaining the line.. <I found 54. ... Qxc2 as I saw the N fork. So after 55. Qe6+ Rf7 (I saw the N promotion idea) and I thought 56. e8=Q+ Rf7 57. Q(8)xf7? e1=Q+ 58. Kh3 Qxe6+ 59. dxe6 Qe4 60. d7 c2 61. e8=Q Qxe8 62. Qxe8 cxd1=Q 62. Qe4+ g6 63. Qe7+ Be7 and wins!>.. The blacks move 55 and 56 Rf7 is same.. Cant follow the line.. probably a typographical error..
Jul-08-12  master of defence: Whats wrong with 54.Qxe2?
Jul-08-12  jancotianno: Thought i was doing great with 54...Qxc2 calculated a few lines and concluded that it was winning decided to confirm it on fritz only to discover i had missed that after 55. Qe6+ Kh7 56. exf8=N+ Kh8 57. Ne3!! is the only drawing line. :(
Jul-08-12  Patriot: <jancotianno> That's exactly what happened to me! In my opinion, 57.Ne3 is not easy to find!

<CG>'s note which says <55.Qe6+! Kh7 56.exf8=N+ => is too simplistic. It's not a draw at least until 57.Ne3 is found. Otherwise people might think 57.Ng6+ Kh8 58.Nf8+ is the draw.

This game is really a nice find by <CG> though. The theme has been underpromotions all week and this game is an exquisite way to end the week! Given it is 4th of July week, it went out with a BANG!

Jul-08-12  hrobert5: I finally had time to rexamine this and set it up on the board. I'm sold on the queen sac...followed by an e1=N+ fork of Q & K:

54. ... Qxc2
55. Qxc2 e1=N+
56. Kh3 Nxc2

This leaves black up a bishop and white knight is trapped. Black king takes care of d pawn and endgame should play out fairly simply from there.

Sorry if someone already posted this and I missed it.

Jul-08-12  hrobert5: Sorry, I skipped a line in my transcription:

57. exf8=Q?+ Kxf8

Jul-08-12
Premium Chessgames Member
  gawain: First time I ever solved one at the insane level. All I did was ask myself: "How do I set up a winning underpromotion to a knight?" and the answer was plain.
Jul-08-12
Premium Chessgames Member
  gawain: Ah, I only THOUGHT I solved it. Oops.
Jul-09-12
Premium Chessgames Member
  Pedro Fernandez: I don't know why CG catalogues this puzzle as insane, because ...54.Qxc2 is an easy move to see; the real threat is, of course, ...55.e2xd1+, so that 55.exf8=Q+ is practically forced, and there is not a better move than 56.Qxc2 as the black have the mortal threat ...56.e2xd1=Q+ (by the queen in c2), and finally the doublet ...56. e1=N is easy to see.
Jul-09-12
Premium Chessgames Member
  Richard Taylor: <iqbalianpawn: <Richard Taylor> Nice post explaining the line.. <I found 54. ... Qxc2 as I saw the N fork. So after 55. Qe6+ Rf7 (I saw the N promotion idea) and I thought 56. e8=Q+ Rf7 57. Q(8)xf7? e1=Q+ 58. Kh3 Qxe6+ 59. dxe6 Qe4 60. d7 c2 61. e8=Q Qxe8 62. Qxe8 cxd1=Q 62. Qe4+ g6 63. Qe7+ Be7 and wins!>.. The blacks move 55 and 56 Rf7 is same.. Cant follow the line.. probably a typographical error..>

Thanks. My point is that 1) Finding the ideas are a good cause for self congratulation. 2) Finding the various defenses are always hard (OTB and in puzzle) 3) Sometimes some players get tempted by the various interesting lines and go down one live only to forget to check simple refutations. 4)There is a time to be inventive and time to be pragmatic!

Jul-09-12
Premium Chessgames Member
  Richard Taylor: <iqbalianpawn:> Here was my "fantasy variation:

54. e7 ....

54. ...Qxc2 55. Qe6+ Rf7 56. e8=Q+ Kh7
57. Q8xf7 e1=Q+ 58. Kh3 Qxe6+ 59. dxe6 Qe4 60. e7 c2 61. e8=Q Qxe8 62. Qxe8 cxd1=Q 63. Qe4+ g6 64. Qe7+ Bg7 wins

But in calculating that I forgot to look at the fairly obvious

57. Qxe2 or even 57. Qe4+

But 54. ... Qxc2 is a clever idea all the same. Of course if 55. Qxc2 e1=N+ should win.

Jul-09-12
Premium Chessgames Member
  Richard Taylor: Also (as people have more or less noted it's not easy to get a draw for White after 54...Qxc2 e.g.):

54. ... Qxc2 55. Qe6+ Kh7 56. exf8=N+ Kh8 57. Ng6+?? (I think from comments here 57. Ne3 is necessary to get a draw.) Qxg6 58. Qxg6 exd1=Q 59. Qe8+ Kh7 60. d6 c2 61. d7 c1=Q 62. Qe4+ g6 63. Kh3 Qh5+ 64. Qh4 Qf1# Or similar.
♗lack mates 0-1

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