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Marciniak vs Henryk Dobosz
Poland (1973)
Sicilian Defense: McDonnell Attack (B21)  ·  0-1


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Kibitzer's Corner
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Premium Chessgames Member
  agb2002: The material is even.

White threatens 16.Qxg7# and 16.Qxc5.

The white queen and the rook on f1 protect the back rank. Therefore, 15... Nf2+ (diverts the rook) 16.Rxf2 (16.Kg1 Ne4+ wins the queen for a piece) 16... Bd4 (diverts the queen):

A) 17.Qxd4 Re1+ 18.Rf1 Rxf1 19.Qg1 Rxg1+ 20.Kxg1 Qg4 - + [Q vs B+N].

B) 17.Qd2 Bxb2 18.Rf1 Bxa1 19.c3 d4 - + [R+B vs N].

C) 17.Qd3 Bxb2, etc.

D) 17.Rf1 Bxc3 18.Nxc3 Rad8 - + [Q vs B+N].

Aug-26-11  Patriot: Black threatens mate, first and foremost, so that narrows the list of candidates significantly. Trying checks first, 15...Nf2+. 16.Kg1 is not an option since 16...Ne4+ wins the queen. So 17.Rxf2 and mate is "on" again. White's back rank is now weak so it looks like a deflection is possible. And what's stronger than 17...Bd4? This stops the mate, strikes the queen and x-rays thru to the bishop and rook. The queen must keep contact with d1. 18.Qxd4 Rd1+ 19.Rf1 Rxf1+ and white can resign since the queen is lost. 18.Qd2 Bxb2 and black wins at least the exchange.
Aug-26-11  sevenseaman: I have selected 4 random puzzles to illustrate the <'how to think'> concept. I know some among you might even take it as a tad presumptuous of me to even try. I do not fancy myself as a great teacher and give myself no 'airs'. Just hope you'll indulge and bear with me.

The puzzles are not for solving but you may think a little before you read the solution.

'How to think' puzzle 1.

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W in 6
The Black K is in lock-up. He can only pace his cell. White must make path on the Q side via 1. Bb7, 2.Bxa6, 3. Bxb5 and now 'a' pawn queens in 3 for the mate.

'How to think' puzzle 2.

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W in 3.
The Black K has no chance of leaving the base. White K is in check. Remove that fetter first. D file opens. Bring the R to it and lo! It mates from d8.

'How to think' puzzle 3.

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B in 2.

Q+ forces the White K on to the 7th rank and Black R is just waiting to bounce it.

'How to think' puzzle 4.

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W in 2
Everything black is in 'lock up' except the Black B. It is the only piece that can move and it <has to>. Therefore my R better be at c2 to deliver mate the moment c-file opens.

All four are randomly taken examples. But they throw some light into our thinking mechanism. Or do they? (Its better to have tried and failed than not to have tried at all).

Aug-26-11  mcguigan97: Wow, I got it! I don't always get Mondays, so a landmark for me :)
Aug-26-11  Patriot: <sevenseaman> Good examples! "Mate in X moves" problems require a different thought process than what is needed OTB. I calculated very little on these because pretty much everything wins and I don't have the time (I'm at work!). The last problem requiring mate in 2, was not easy for me which shows I could use practice with zugzwang problems, although 1.b7+ Kh7 2.b8=Q+ Kh6 3.Qg6# which would be "good enough" OTB. But I do get your point about applying logic first rather than jumping into calculation, and it's a good one!
Premium Chessgames Member
  patzer2: I didn't miss a tactic, but forgot to mention another obvious one involved in the puzzle in my previous post.

After 15...Nf2+, if 16. Kg1 then 16...Ne4+ wins the Queen via a discovered check.

Aug-26-11  olmandufer: Must be too easy for Friday since olmandufer solved!
Premium Chessgames Member
  kevin86: Bd4!! A brilliant intermezzo.
Premium Chessgames Member
  kevin86: The queen must move or take. If she moves back to d2 to protect e1,Bxb2 may be a fate WORSE than death.
Aug-26-11  sevenseaman: <Patriot> I am very happy you found time to apply a little mind to what I put on the plate. I agree 'set' puzzles are way different from OTB situations. OTB one aims to win. Even if it takes a little longer, one is apt to choose the line one is more sure of. Its a delight that you found an alternate solution to the last puzzle, albeit taking an extra move. I am sure I'd do the same OTB.

What I was trying to do was to suggest a way of 'how to think' on each puzzle rather than prompt people to become puzzle cracking maestros. I assure you all the time I was aware that I was addressing people who are much wiser than me. Your approach is already sound and systematic and I know you have time constraints.

I am holding no brief for anyone. It was after a lot of internal debate with self that I decided to proffer 4 examples as illustrative of a small point. I have had it on my mind for some time and decided to share it today. Thanks.

Aug-26-11  scormus: I had 15 ... Nf2+ 16 Rxf2 and Qg4 wins doesnt it? er no, I missed the defense 17 Rf1 Re2 18 Qf3 Qxf3 19 gxf3 Rxc2

B gets a pawn and some positional points but W should win OK

Easy once you see 20 posts giving the right answer. Perhaps I was trying to be too clever

Aug-26-11  BOSTER: Inadequate players. Inadequate games.

<Jim>, <Patriot>. Yesterday you were right.

Premium Chessgames Member
  FSR: 15...Nf2+ 16.Rxf2 (16.Kg1 Ne4+ wins the queen) Bd4! wins material. White's best appears to be something like 17.Nd2, giving up the queen for two pieces.
Aug-26-11  hedgeh0g: Not sure why this puzzle is classed as difficult, since after the obvious ...Nf2+, everything is more or less forced.
Premium Chessgames Member
  chrisowen: Amausing richter rousing black levels it off in the guilloteens nif2 left jab bd4 right jab HD made short work re1 elemantary it induce moose qc3 panzer sees mate squirel knight check and thats my baby
Premium Chessgames Member
  FSR: Exactly what I was thinking.
Aug-26-11  sevenseaman: <David2009> <Enjoy finding the colours-reversed win!>

With Crafty you have to think on your feet because it keeps shooting surprises at you like a pea gun.

Colours reversed win is available. I had to accept an opportunity when Crafty offered me a R+B for the Q and I ultimately ended up with a R against a N to get home.

Aug-26-11  Patriot: <sevenseaman> I think you made a good point. There seems to be many angles to think about a given position. The last position in particular is one I'm not especially strong at--zugzwang. I would either have to switch gears and think a different way, or modify the way I think to accomodate for positions like that. The fact that the bishop is the only mobile piece gives a clue so perhaps whenever a position is reached where everything (or almost) is frozen in place, a red flag should be raised that indicates a possible zugzwang. This falls under having a "sense of danger". For example, the other day I was watching a live game between one of my club members and someone else online. Black moved their queen close to white's kingside and immediately I began wondering if there was a trap. I didn't see a convincing variation or anything but thought something "might" be there. Sure enough there was and it was very subtle. I was thrilled just to have seen it and when I put the position in a chess engine, the evaluation went very high in white's favor for the same candidate I chose. But only after sensing danger, I started looking for ways to trap the queen. It didn't come from examining all forcing moves because the move itself did not appear threatening until examining it.
Aug-26-11  David2009: Marciniak vs H Dobosz, 1973 postscript: <sevenseaman: <David2009> <Enjoy finding the colours-reversed win!> With Crafty you have to think on your feet because it keeps shooting surprises at you like a pea gun. Colours reversed win is available. I had to accept an opportunity when Crafty offered me a R+B for the Q and I ultimately ended up with a R against a N to get home.> Congratulations! I eventually found a different win with (with normal colours, Crafty finding the White moves) went: 15...Nf2+! 16.Rxf2 Bd4! 17.f5! Bxc3 18.Nxc3 d4 19.Ne2 c5 20.f6 gxf6 21.Ng3 Re5 22.Rxf6 Kg7 23.Raf1 Rae8 24.Bc1 Re1 25.Bd2 (this move surprised me: why not drive the King back with Bh6+ first?) Rxf1+ 26.Rxf1 Kg6 27.Rf3 to reach

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Now 27...h5 works well against Crafty after 28.Kg1 h4 29.Nf5 Qxf5 30.Rxf5 Kxf5 with a fairly straightforward win, but first time round I played 27...f5 and was surprised by 28.Kg1! (instead of R or N x f5) h5 29.Rxf5 Qxf5 30.Nxf5 Kxf5 31.Kf2

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White has only one Pawn for the exchange but can still put up a surprisingly stiff resistance: I only drew first and second time round. Here's a link to the colours-reversed position to try to win it against Crafty EGT: There may well be several winning strategies, but all seem to requires accurate White play. I will post one solution on my forum in due course (unless someone posts one first). Enjoy exploring the possibilities!

Aug-26-11  Robespierre: <<"Flash, Flash, I love you, but we only have 14 hours to save the Earth!">>

The difficulty with ONCE's analyses is that they're so often riddled with obscure references to American popular culture in the 40s, 50s & 60s that only a few people of my advanced age (64) & with a solid memory of that period can appreciate them completely!

Aug-26-11  hedgeh0g: I wonder when <chrisowens> will decide to stop posting. If it's being done for amusement, surely the novelty has worn off by now. If he's being held captive in some weirdo's basement and is trying to communicate using a complex code, surely he'll realise it's not working...
Aug-26-11  tacticalmonster: 15 Nf2+ 16 Rxf2 ( 16 Kg1 Ne4+) Bd4 17 Nd2 ( any queen move Black will be up a rook) Bxc3 18 Bxc3
Aug-26-11  sevenseaman: <David2009> Good to see you have been on a voyage of discovery with Crafty. I played out your foray. New and enjoyable.

I love beating the program because it is never easy, at times even frustrating. And it always widens the picture, a big positive.

But how did you persuade Crafty to defend from the White side. You some Edison or an ancient slave manager?

Aug-26-11  M.Hassan: "Difficult" Black to play 15...?
Equal in forces
Black is one move away from being checkmated on g7 while Black Rook having clear e file at his disposal can sit on e1 to mate White King only if f Rook was not there and e1 square not guarded by the Queen.Can Black divert two strong pieces?, Yes he can:

Rook must tke the Knight otherwise:<16.Kg1 Nh3++#>

16.Rxf2 Bd4!
<if 17.Qxd4 Re1+ 18.Rf1 Rxf1+ 19.Qg1 Rxg1 20.Kxg1 White looses the Queen and is behind in material>

White can let his Queen go and follow this line:
17.Kg1 c5
18.Qxd4 Re1+
19.Rf1 Rxf1+
20.Kxf1 cxd
21.Bxd4 Qf5
Slightly better than the above line but still White is behind.

Time to check

Aug-27-11  sevenseaman: <Patriot> Good to see you took some interest. You have a very open mind.

It seems only the last problem intrigued you. Should I infer you read the solutions to the other three too soon. If that happens the problems tend to become blase and easily forgettable.

You know OTB there are going to be no red flags to fall. No one will ever know how many 'red flags' he missed in life. In a puzzle we know.

I give here a very good, purposely selected example from Nezmetdinov's real-time chess. This Novotonyish problem is very engaging (if you have not already seen it). Difficulty is marked 'Easy'; try. (I am not embarrassed to admit I had to be prompted)

Rashid Gibiatovich Nezmetdinov - Yuri Mikhailovich Kotkov, Krasnodar 1957.

click for larger view

W in 2.

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