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John Cochrane vs Somacarana
Calcutta (1856)
Sicilian Defense: McDonnell Attack (B21)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Apr-05-10  karnak64: Hmm, this Somacarana chap goes by one name. Chess player, or Brazilian soccer star?

(Okay, I read his page, he lived in Calcutta and no one seems to know much about him).

Apr-05-10
Premium Chessgames Member
  johnlspouge: Monday (Very Easy)

Cochrane vs Somacarana, 1856 (29...?)

Black to play and win.

Material: B for N. The White Kh3 has 1 legal move, h4. The White Rf2 has the absolute burden of preventing Ra2xh2#, suggesting that Black should overload Rf2.

Candidates (29...): Qf3+

29Qf3+

(1) White cannot accept the sacrifice:

30.Rxf3 Rxh2#

(2) 30.Kh4

I went for <30Bf6+>, which (like everyone elses move) leads to an overwhelming win for Black. As <TheBish> points out, the puzzle position is a forced mate.

Apr-05-10  YetAnotherAmateur: I believe <agb2002> pointed towards another win. The approach I took that appears to work: 29. ... Qf3+
30. Kh4 (if Rxf3, Rxh2#) g5+

A) 31. Kh5 Qh3+
32. Kxg5 h6+
33. Kg6 Be8+
34. Rf7 Bxf7#

B) 31. Kxg5 Bf6+
32. Kh6 Qh3#

C) 31. Bxg5 Qxf2+

C1)
32. Kh3 Qxh2#

C2)
32. Kh5 Be8+
33. Qg6 Bxg6+ (this move can be skipped, it just delays things a bit) 34. Kh6 Bg7#

C3)
32. Qg3 Bxg3+
33. Kh5 (if hxg3, Qh2#) Qxh2+
34. Bh4 Qxh4#

Which is a long way of saying "forced mate in 5".

Apr-05-10  remolino: 29...Qf3+
Apr-05-10  desiobu: For some reason I thought it was white to play, and was trying to defend against the coming ...Qf3+. The simple Nxe5 probably does it. Shows the power of a tempo.
Apr-05-10
Premium Chessgames Member
  sethoflagos: <goodevans: <snip>, <26 Kg2> looks like a horrible blunder to me. What's wrong with the simple <26 Rf1>?>

Not sure. 27. Rf1 is safe enough - after 27. ... Rxf1 28. Qxf1 it looks drawish. I think white was expecting

27. Kg2 Qb5
28. Nxe5 Qxd3
29. Nxd3 which leaves white comfortably ahead.

Even better for white is

27. Kg2 Ra2+
28. Bd2 Bb5
29. Nxb6 Bxd3
30. Rxd3

28. Rf2 was the real blunder

Apr-05-10
Premium Chessgames Member
  gawain: Nifty position! Qf3+ wins by deflecting the rook and allowing Rxh2#.

It's nice how the g4 pawn blocks the King's escape and how the same Bishop that is supporting the rook at h2 also covers the g3 square. The setup pleases me a lot.

Apr-05-10
Premium Chessgames Member
  kevin86: Black offers his queen-if accepted,the result is immediate mate;if declined,the game tumbles like dice.
Apr-05-10
Premium Chessgames Member
  thegoodanarchist: <karnak64: Hmm, this Somacarana chap goes by one name. Chess player, or Brazilian soccer star?>

or both??? :)

Apr-05-10
Premium Chessgames Member
  thegoodanarchist: <jussu: Oh dear, 29... Qf3+ 30. Kh4 g5+ 31. Bxg5 Qxf2+ of course. I really am getting too old for chess.>

How about 30. Kh4 Bf6+ 31. g5 e5 32. Qf5 (only move) Bxf5#

Apr-05-10  goodevans: <sethoflagos: ... 27. Rf1 is safe enough - after 27. ... Rxf1 28. Qxf1 it looks drawish.>

But 27 Rf1 Rxf1+ 28 Kxf1 still leaves white with three pieces en prise. Surely this must be winning?

<Even better for white is

27. Kg2 Ra2+
28. Bd2 Bb5
29. Nxb6 Bxd3
30. Rxd3>

So by my reckoning white missed two winning opportunties.

Apr-05-10  StevieB: If I got it, it must be very easy. (pats back)
Apr-05-10
Premium Chessgames Member
  Bozantium: 30. Kh4 g5+ and wins.
Apr-05-10  VincentL: In this "very easy" position, the trick is 29.... Qf3+

If 30. Rxf3 Rxh2 mate

If 30. Kh4 g5+. Here black has various posible responses.

31. Bxg5 Then 31....Qxf2+ On 32.Kh3 Qh2 mate On 32. Kh5 Be8+ 33. Kh6 Bg7 mate On 32. Qg3 Bxg3+ and mate follows

31. Kxg5 Bf6+ 32. Kh5/Kh6 Qh3 mate

31. Kh5 Be8+ On 32. Kxg5 Bf6+ 33. Kh6 Qh3 mate On 32. Kh6 Bg7+ 33. Kxg5 Bf6+ 34. Kh6 Qh3 mate

Apr-05-10  DarthStapler: I picked Rxf2 after Kh4, that's still good enough to win I think
Apr-05-10  Shah Mat: <goodevans: What's wrong with the simple <26 Rf1>? Now black has all four (!!) of his pieces en prise and I can't see how he would avoid losing material>

after 27...Rxf1 28. Kxf1 Qb5 and the game is equal. so you're absolutely right: Kh4 was a blunder.

Apr-05-10
Premium Chessgames Member
  sethoflagos: <goodevans:
But 27 Rf1 Rxf1+ 28 Kxf1 still leaves white with three pieces en prise. Surely this must be winning?>
27. Rf1 Rxf1+
28. Kxf1 Qa6! (not 28. .. Qb5 29. Nxe5 Qxd3 30. Nxd3)

If 29. Nxe5 Bb5 wins Q

29. Qxd7 Qxc4+

gets quite tense, but I think either side can settle for perpetual check/draw by repetition.

Apr-05-10  The Rocket: Took me aproximately 7 seconds to spot:) very nice way to finish a game
Apr-05-10  TheaN: Monday 5 April 2010

<29....?>

Target: 0:40;000
Taken: 0:10;994

Material: Black up minor piece exchange: 2♗ / ♗+♘

Candidates: <[Qf3]>

-ML-
Without initially seeing the followup, the only reasonable Queen sac is:

<29....Qf3> this move is NOT completely forced, meaning there are two variations. Capturing ends immediately.

/A\
<30.Rxf3 Rxh2 0-1> opening up the second rank is not advisable.

/B\
<30.Kh4> and although there might be a completely forced mate here, White be willing to capitulate after:

<30....Rxf3 > losing at least the Rook with a hard to par mate threat on h2.

Apr-05-10  Cushion: Qf3+ wins nicely.
Apr-05-10  wals: Rybka 3 1-cpu: 3071mb hash: depth 14:
A few errors calculated by Rybka -
White
23.Bxc4 (-1.33) Better was Nxc4 (+0.07)
Black
24...dxc4 (-0.21) better was Qd6 (-1.60)
25...Nf3+ (+1.40) Better was Bxh2 (-0.23)
27...Ra2 (+2.54) Better was Qb5 (+1.39)
White
28.Rf2 (-0.97) better was Bd2 (+2.54)
29.Kh3 (-#6) better was Kh1 (-0.97)
Apr-05-10  SharpAttack: <Wals> 29. Kh1 is an illegal move..dunno how you got that out of Rybka!
Apr-05-10  wals: <SharpAttack> Typo sharp eyes, should read Better was 29...Kg1
Apr-05-10
Premium Chessgames Member
  sethoflagos: <Shah Mat>

Apologies. I missed a resource and you're absolutely right. 27. Rf1 Rxf1 28. Kxf1 Qb5 is correct and a stone cold draw.

Apr-06-10
Premium Chessgames Member
  sethoflagos: <goodevans:> Yes indeed, 30 c4 was the resource I overlooked.
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