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Ian Rogers vs Gilberto Milos
"The Wizard of Oz" (game of the day Jul-09-2009)
Manila Olympiad (1992), Manila PHI, rd 10, Jun-18
Indian Game: Wade-Tartakower Defense (A46)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 5 ·  Later Kibitzing>
Jan-30-11  knight knight: Oh, 26. Bxc6+ lol I thought that wasn't a good move so didn't analyse it!

Nevermind, time for a coffee and the Andy Murray match...

Jan-30-11  Pygeum Lycopene: i got the first two moves of this puzzle and considered the third before choosing 28.Nb4 instead. however, i never would have guessed the rest of it. the importance of playing Rb3 with the Knight at d5 did not formulate in my patzer brain. the incredible move to me now is 25.Bd7, which shows white knew what he had from the start. do they give triple exclamation points anymore?
Jan-30-11  wierba: 33...Kb8 34.Nxc8+ Kc7 35.Qxa7+ Kd8 36.Rb8 Qc7 37. Ne7+ Kd7 38. Rb7 Ba5 39. Rxc7 Bxc7 40. Nd5 Rc8 41.Nf6+ Ke7 42. Qb7 or Nxh7
Jan-30-11
Premium Chessgames Member
  Once: "The unknown future rolls toward us. I face it, for the first time, with a sense of hope. Because if a machine, a Terminator, can learn the value of human life, maybe we can too."

<Sarah Connor, Terminator 2, Judgment Day.>

Dan Heissman tells us not to play Hope Chess, that we should never trust to an "unknown future", that we should calculate, calculate, calculate.

But I am not so sure.

Today's puzzle is all about the value of life. Do we save the attacked bishop on d7 (say with Bh3), or do we do something more noble and sacrifice it? This being a puzzle, and T2 being a Hollywood blockbuster, we kinda know the answer, don't we? Unless this is one gigantic spoiler, it surely has to be a sac.

And anyway, 26. Bh3 doesn't really appeal. Black gets to play f6 and/or f5 and all of a sudden the black kingside whirrs into life with mechanical menace. Skynet declares war on all humanity and we face a future of living in cellars and eating baked beans from the can.

So the sequence that appeals is Bxc6 Nd5-Rc3/Rc2. Oh, and black gets to play some moves too. We have given up a precious life (the bishop on d7) in return for a pawn, a knight outpost and open lines for our heavy pieces to attack the black king. I'd call that a fair exchange.

And perhaps we can stop calculating there. The sac just feels right. We can trust to our judgement that we are getting enough from the deal to justify the loss of life. Leave the variations to the superheroes and let's opt for an <unknown future>.

Plug the game into Fritz and something interesting happens. At first he prefers 26. Bh3 which he rates as a very slight white advantage of around +0.3. He rates 26. Bxc6+ as half a box of duck eggs (0.00).

But then we step through the game, giving him just a few seconds to look at each move. And sure enough he keeps on saying 0.00 - a draw by repetition or perpetual. John Connor and Skynet fight to a mutual standstill.

Then we arrive at judgment day. As soon as we play 30. Rdd3, Fritz's little eyes light up red and he starts talking like an Austrian bodybuilder. The row of duck eggs are crushed under metal feet and he's talking about a big white advantage. Now when we rewind back to the puzzle position, he can see it. The machine now understands the real value of life, of the Bxc6 sacrifice.

And if a machine can learn the value of life, maybe we can too?

Jan-30-11  Fuegoverde: Very beautifull puzzle. Get some of the ideas, but that was all for me. Interesting post by <Once> , Fritz can learn through the game? ... wow!
Jan-30-11  SvetlanaBabe: At his best Rogers was indeed a wizard!
To think the current President of the Australian Chess Federation, Gary Wastell, tried to stop GM Ian Rogers from playing overseas when he was a young aspirant.
Jan-30-11
Premium Chessgames Member
  lost in space: Saw the first few moves, but not enough to claim having solved the puzzle.

Hoping for next week

Jan-30-11  David2009: I Rogers vs G Milos, 1992 White 26?

Material is level but White is temporarily a R and B ahead: how to take advantage? Is a snap mating attack possible? 26 Bxc6+ Qxc6 27 Nd5 with pressure but Black can unravel with ...f5 etc. OTB I would play 26 Bh3 expecting 26...Bf5 27 Bg2. But this is an Insane puzzle, so I spent a long time looking for forcing sequences and not finding them. Finally I looked again at 26 Bxc6+ Qxc6 27 Nd5, Black has to do something about his attacked Bishop. Idea- if all the major pieces come off does White have the better ending? It costs Black a Pawn to un-tomb his Bishop but he can then break and create a pased h Pawn. Perhaps this is it. Time to analyse.

Variations:
(A) 27...Qd7 28 Nxe7 Qxe7 29 Rxd6 Rd8 30 Qd3 Rxd6 31 Qxd6 Qxd6 32 Rxd6 and White although a piece for two Pawns down has the better ending; (B) 27...Bd8 28 Nb4 wins the d6 Pawn.
Final answer: Bxc6+. Time to
check:
=====
Well I got the first move. Can I now win the puzzle position


click for larger view

(I Rogers vs G Milos, 1992 White 26?) against Crafty End Game Trainer? Link:
http://www.chessvideos.tv/endgame-t...

There is a major hole in my analysis: after 27...Bd8 28 Nb4, 28...Qb5! pins the N. Crafty EGT follows the game line then deviates into a tougher defence. Enjoy finding the win against the EGT. If time allows I can set up my defence (A) and see if I can win against it. Meanwhile other duties call :) - time to pause.

Jan-30-11
Premium Chessgames Member
  rilkefan: <David2009: I Rogers vs G Milos, 1992 White 26?>

I greatly appreciate your contributions here. I've just tried my second line, 26.Nb5, and Crafty responds with ...Qxd7. After 27.Nxd6, which above I call strong, it just plays ...Qc7 (which I had started worrying about after posting earlier) and as far as I can tell white's control of the d file evaporates.

Jan-30-11
Premium Chessgames Member
  johnlspouge: < <Once> wrote: [snip] As soon as we play 30. Rdd3, Fritz's little eyes light up red and he starts talking like an Austrian bodybuilder. [snip] >

This problem provides an opportunity to test the puzzle-solving ability of different chess engines. My timing tests used an Intel 4GB RAM 2.40 GHz dual processor.

The ponderous T-800, Stockfish-201-32-ja, using two processors, raises the Uzi (26.Bxc6) at 16:36.

The slightly senile shape-shifting T-1000, Rybka 2.3.2a.w32, remembers how to make a stabbing weapon at 13:39.

The lithe and agile T-X, Toga 1.3 beta1, whips out the plasma cannon and fires at 6:59 (7:09, on a second trial, suggesting about 2% timing error).

IMHO, for <CG>'s puzzles, Rybka appears over-rated; Toga, under-rated. As a Toga derivative, the main programming improvement to Stockfish is apparently the ability to commandeer all your computer's processors, although I admit that it is truly marvellous to see so many variations spilling out of your computer so fast.

Other timing runs on this puzzle might be interesting. It seems easy for human intuition, but thorny for software.

Jan-30-11  MiCrooks: Looks like some missed the best line after Kb8 Nxc8+ Kc7 not Qxa7 but Rxc3 pinning the Queen to the King. Then Qxc3 bxc3 Rxc8 Qxa7+ Kc6 Qxf7 Bg8 Qxg6 is much more convincing...this is an easy win for White.
Jan-30-11
Premium Chessgames Member
  Jimfromprovidence: Beautiful game. I was overmatched with both todays and yesterday’s puzzles but I didn’t mind a bit.

Did anyone notice the creative journey the LSB of white took to get to c6?

So, in the move before the puzzle in order to save black, how about the simple 25...Rb8!?, threatening mate in one.


click for larger view

If 26 b3, now the white rook can’t get to the b file.

If 26 Bxc6+, it looks like mimicking the text continuation falls one tempo short for black in a very complicated position.

Jan-30-11
Premium Chessgames Member
  Once: <John> Fritz 11 on a relatively new computer took around 6 minutes of stalking through a crowded night club to acquire its target.
Jan-30-11
Premium Chessgames Member
  Patriot: Material: Black has the bishop pair.

Threats: White's bishop is trapped and black threatens Qxd7.

A key point is that the bishop on h7 is essentially not on the board--it is completely hemmed in by his own pawns and out of play.

This suggests a desperado of 26.Bxc6+. But there are a few other candidates to at least briefly consider: Nd5, Nb5, Rxd6.

26.Nd5 cxd5 27.Ba4 I see nothing else too interesting for white.

26.Nb5 cxb5 27.Bxb5. I'm not very confident in this idea. It's unclear what the rooks are going to do.

26.Rxd6 ("protecting" the bishop) Bxd6 and then what?

Now I'll look at the move I wanted to play.

26.Bxc6+ Qxc6 27.Nd5

A) 27...Qd7 28.Nxe7 Qxe7 29.Rxd6 Rd8 30.Qa6 looks very strong for white.

B) 27...Re8 28.Rc3 followed by 29.Nc7+ and 30.Nxe8

C) 27...Bd8 28.Nb4 followed by 29.Rxd6

It's not completely clear to me what might happen, but in all three variations above white has initiative and black is essentially playing down materially thanks to the h7-bishop. Another possibility is 27...Bxg5 28.hxg5 but this eliminates his active bishop and affirms white's position as better.

Now to see how far I'm off on this.

Jan-30-11
Premium Chessgames Member
  johnlspouge: < <Once> wrote: <John> Fritz 11 on a relatively new computer took around 6 minutes of stalking through a crowded night club to acquire its target. >

Crafty, on the other hand, chilled out and enjoyed the music: 23:44.

Your processor speed is useful in the comparison. It is under Control Panel -> System on a Windows machine. In any case, as Cyrus the Virus <Once> said to Garland Green: "Love your work!"

Jan-30-11
Premium Chessgames Member
  Once: Ah, you want me to put the bunny back in the box, eh?

Apparently I've got an Athlon II X4 630 2.80 ghz with 4GB of RAM.

Whatever that means...

Jan-30-11  RandomVisitor: Does white have an earlier way to win? After 23.Bxh7! Rxh7 24.dxc6 black has poor survival chances:


click for larger view

Rybka 4:

<[+1.66] d=23 24...bxc6> 25.Na2 Qb5 26.Qf3 g6 27.Rb3 Qa4 28.Nb4 Rb8 29.Qh3 Rhh8 30.Qd7 Rb7 31.Qxc6 Qxc6 32.Nxc6 Rxb3 33.cxb3 Bd8 34.Rd1 Bc7 35.Ne7 Kb7 36.b4 Rf8 37.Nd5 Bd8 38.Rd3 Kc6 39.Kc2 Bb6

Jan-30-11
Premium Chessgames Member
  johnlspouge: < <Once> wrote: [snip] Apparently I've got an Athlon II X4 630 2.80 ghz with 4GB of RAM.

Whatever that means... >

Yours is a little faster than mine (2.80 GHz vs. 2.4 GHz, a "Hertz" being a cycle per second), so Fritz and Toga performed comparably.

Yours is also about as big as mine, a statement <JG27Pyth> might call a "BPB". I would explain that acronym, too, but the explanation would probably be censored (again)...

Hasta la vista, baby :)

Jan-30-11
Premium Chessgames Member
  scormus: I was OK until 27... Bd8, for some reason I imagined ... Qd7 would be played instead. Then 28 Rc3 and I suppose the only way to parry the threat of Rc7 is 28 ... Bd8 and the BQ is in the wrong place.

Yes, a wonderful combination, brilliantly topped off with 31 Rdc3! I admit I'd never have forseen that.

Sigh. Seems not only can I not solve these puzzles, I'm not getting the puns either, I thought the Wizard of Oz was Magnus.

Jan-30-11
Premium Chessgames Member
  johnlspouge: < <scormus> wrote: [snip] I'm not getting the puns either, I thought the Wizard of Oz was Magnus. >

The pun puzzled me, too: "Oz" = "Auz" = "Australia", where Ian Rogers hails from.

Jan-30-11  patzer2: For today's insanely difficult Sunday puzzle, Ian Rogers 26. Bxc6+!! sacrifices a piece to destroy pawn cover and expose the weakly protected King and the unprotected Bishop and Queen to a decivise attack.

As <Once> observes it is extremely difficult to calculate all the variations, but the positional advantages scream for the sacrifice:

1. Weakly protected King position

2. Unprotected Queen and Bishop

3. Bad White Squared Bishop completely out of play.

4. White's pieces are all in play and potentially active.

5. 26. Bxc6!! Qxc6 27. Nd5! makes a threat and clears the way for all White's pieces to quickly mobilize and join in the attack.

Even so, preceisely calculating all the possibilities is extremely difficult. I wonder if Rogers calculated all of this out in advance or simply played the sacrifice on general principles and figured it out as he went.

P.S.: White's winning position came about because of the miscue 25...Qc7?! Instead, 25...Rb8 stops the threat of 26. Bxc6 and fully equalizes.

Jan-30-11
Premium Chessgames Member
  Patriot: <David2009> <There is a major hole in my analysis: after 27...Bd8 28 Nb4, 28...Qb5! pins the N.>

I didn't consider 28...Qb5 either. In your variation A, white may have the better ending but I would rather try to retain my active pieces with 30.Qa6 instead of 30.Qd3. For instance, 30...Rxd6 31.Rxd6 Rd8 32.Qc6+ Kb8 33.Qb5+ and go from there. 33...Ka8? 34.Qd5+ wins. 33...Kc8 34.Qc5+ Kb7/Kb8 (34...Qc7 35.Rc6 ) 35.Rb6+ wins the queen.

I didn't see all of that at first but was thinking more as a general principle, when you have an attack, try not to exchange all of the attackers (especially the queen).

Jan-30-11
Premium Chessgames Member
  Patriot: <patzer2> <I wonder if Rogers calculated all of this out in advance or simply played the sacrifice on general principles and figured it out as he went.>

Good question and we may never know the answer. I see now that I did not assess the position correctly--the bishop on d7 is NOT trapped! This takes the problem in a different direction. If it were trapped then Bxc6+ must be played. Then I would wonder how the bishop became trapped and if white calculated everything from previous moves, which would be even more impressive!

I think he may have calculated it out because he still had Bh3 as an option. But I don't think it's completely necessary because the h7-bishop may as well not be on the board.

Jan-30-11  CHESSTTCAMPS: This middlegame position looks somewhat more comical than insane. White is effectively a minor piece ahead, given the ugly position of the black LSB on h7, which has apparently buried itself with the maneuver Bf5-Bh7-g6. With both rooks and both bishops languishiing on the kingside with low mobility, black is ill-prepared to cope with a queenside invasion, especially considering the difficulty of extricating the buried bishop. The following sacrifice makes it easier to invade on the light squares:

26.Bxc6+ Qxc6 (Kb8? 27.Nd5 wins quickly) 27.Nd5

The knight on d5 is already stronger than the black bishops combined. Furthermore, white gains tempi for mobilizing the majors by attacking the Q and DSB.

A) 27... Bd8 28.Rc3 Qb7 29.Rb3 Bb6 30.Nxb6 axb6 31.Rxd6 Ka7 32.Qd3 and the threat of Rd7 wins.

A.1) 28... Qd7 29.Qa6 Be7 (otherwise 30.Rc8+) 30.Rc7 wins

A.2) 28... Qa4 30.Rc4 Qa5 31.Rb4 f5 32.Qc4 Qc5 (Bb6 33.Qc6+ Kb8 34.Rxb6 axb6 35.Qc7+ Ka8 36.Nxb6+ wins) Qa6 and black can resign.

I present the preceding lines as strong evidence that black can't defend the a8 diagonal if white continues correctly. Because I have already exceeded my time limit, I will not analyze the defenses B) 27... Re8 C) 27... Qb7 and D) 27...Qd7.

Time to test against Crafty EGT and view the game.

Jan-30-11  CHESSTTCAMPS: My analysis was OK as far as it went, but I lost to Crafty on the first try. Later I will review to determine where I missed my chance.
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