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Rybka (Computer) vs Pandix (Computer)
28th Dutch CC (2008), Leiden NED, rd 3, Nov-14
Spanish Game: Closed. Martinez Variation (C78)  ·  1-0



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Given 15 times; par: 52 [what's this?]

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Kibitzer's Corner
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Feb-22-12  LIFE Master AJ: I solved this in around five-to-seven minutes. (If that sounds like a lot of time, sorry, its just the way I do things.) I also ran through my checklist as well.

(I will give them in the order that I considered them.)

#1.) 34.Be3. (This saves the Bishop but it's too boring, and has no real threat.)

#2.) 34.Qf6. (Almost works.)

#3.) 34.BxP/a6. Snips a Pawn, and there are many follow-up threats.

I eventually went with the third candidate move, I won't bore you with my analysis; other posters usually do it first and they do an excellent job. (I obviously got it.)

Feb-22-12  LIFE Master AJ: I will add that I thought this tougher than the average Wednesday puzzle, did anyone else have that feeling?
Feb-22-12  The Rocket: I solved it in around 2-3 mins and I would say it's a good medium puzzle.
Premium Chessgames Member
  kevin86: I missed this one entirely,instead looking at a mate that wasn't 34♘c7+ ♕xc7 35 ♕f7+?? ♖xf7 and ♗xf7 is not mate... oops!
Premium Chessgames Member
  FSR: I would play 34.Bxa6! Qb8 35.Rb1! Nb4 (what else?) 36.Be3 followed by cxb4, winning a piece.
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  Jimfromprovidence: <Patriot> <35...Nb4 is an interesting variation. 36.cxb4 hxg5 37.b5 I guess?>

Take a look at the variation I posted earlier with 37 Bb5.

click for larger view

The bishop is safe because of the beautifully posted knight. 37... Qxb5?? loses to 38 Nc7+.

The real threat is 38 Nf6+. If 37...Rf7 , then 38 Bxd7+ Kxd7 39 Nf6+.

click for larger view

After winning the exchange, White will follow up with Qf7+.

Feb-22-12  mworld: What a great game to play through.
Feb-22-12  goodevans: <LIFE Master AJ: I will add that I thought this tougher than the average Wednesday puzzle, did anyone else have that feeling?>

I would say that anyone who <doesn't> think this is tougher than the average Wednesday has missed something. With so many promising continuations to choose from, what makes Bxa6 the best is not that it wins (a fairly small amount of) material, but that at the end of the combo black is left virtually paralysed and powerless to stop an eventual invasion.

Feb-22-12  Marmot PFL: It took a while to find Bxa6. Taking the QRP is probably not the first thing that would occur to most players in this position but computers look at everything.
Feb-22-12  frantz: Those who had difficulties with this problem seem to have focused on "mating the stalemated King". The problem is more easily solved if, after having realized that f7 is solid, one tries to "mate" the "stalemated" Queen which is much more vulnerable!
Feb-22-12  doubledrooks: The Black queen is the only piece stopping Nc7#, so the idea is to drive it from controlling c7:

34. Bxa6 Qb8 35. Rb1 Nb4 36. Bd2 Rf7 37. Qe2 Qa7 38. cxb4 and now if 38...Qxa6 then 39. Nc7+ and 40. Nxa6

Feb-22-12  HectorChess: Wow! If only I could play like rybka...
Feb-22-12  LoveThatJoker: Witty puzzle!

I'm liking 34. Bxa6! Qb8 35. Rb1! Nb4 (35...Qxb1 36. Nc7#; 35...Qa7 36. Rb7 renewing the mate threat with tempo) 36. Bb5! hxg5 (36...Qb7 37. Nf6+ winning outright) 37. Bxd7+ Rxd7 38. Nf6+ Ke7 39. Nxd7 Kxd7 40. Qf7+ Be7 41. cxb4 and White is up the exchange with a better position.


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  Once: Computers obviously don't know about the patented <Once squint method>.

First let me tell you about the patented <Once whodunnit solver>. Picture the scene. You are settled on the sofa with your family around you. On the squawk box is one of those murder mystery shows. You know the type, where someone is stoopid enough to get on board a train with Miss Marple (will they ever learn?) and winds up being ever so slightly dead.

At this point, your family pitch in with their theories. "It must of been (sorry, Dom!) the butler," cries your yoof teenage son.

"I don't trust the wife," says your other half, who never trusts anyone with a dress size smaller than her own.

And then you sagely say ... "It was professor Plum, with the candlestick, in the drawing room." Okay, so you don't say that. But you do name the murderer with uncanny accuracy. Your kids stare at you with newfound respec' and your significant other remembers just what it was he/she married you for, such a long long time ago in a galaxy far, far away.

Here is the trick. Take a look at all the potential suspects. Identify the one character who is being played by quite a well-known actor or actress, but who hasn't had all that much to say yet. That will be your murderer. They will unleash all their thespy thespiness in the fifth reel with a magnificent speech ... "And I would of (sorry Dom) got away with it if it wasn't for those pesky kids"

Now you want to know the patented <Once squint method>, don't you? Okay, here goes. You need to stare really hard at a chess puzzle and then scrunch up your face and eyes until all the pieces become a blur and start to merge in to each other. Try to hit the sweet spot just before you pass out from oxygen deprivation.

What you will find is that all the pieces tend to point towards the murderer, I mean the key move of the combination. Silman says we should attack where our pieces point. I prefer to use the once squint method.

In today's POTD, that clearly points us to h6 and or f7 as the focal point of our combination.

Except of course, computers can't blink or squint. Which is why they can find moves like Bxa6 and the rest of us are accusing Colonel Mustard of either being pleased to see us or having a pistol in his pocket.

Feb-22-12  VincentL: "Medium/Easy".

I have looked at this for some time and am not making progress. I have tried to bring about mate with Qf7 or Qf8, with such diverting moves as Rxh6, but cannot get these ideas to work.

Either I am blind today or this is tough for a Wednesday.

Let´s see.

Feb-22-12  VincentL: I think I only looked from the c file to the right.

I did try combinations ending in Nc7# but for some reason did not consider Bxa6.

A case of easy when you see it.

Feb-22-12  BOSTER: Because the position on diagram is very intrigue I expected more <tactical vision> from computer.

I saw the line which played <Rybka>, but I was not satisfy.

I guess that computer's evaluation is very different from human's.

Feb-22-12  David2009: Rybka vs Pandix, 2008 White 34? Here's the puzzle position:

click for larger view

Pandix resigned after move 39. Crafty Endgame Simulator defends differently and loses differently. Enjoy finding the win - second tioe round for me. First time round I blundered into what may or may not have been a fortress draw - be warned! Interactive link:

Premium Chessgames Member
  chrisowen: In half it nf6 in black's holes or bet form channels it arctic in pattern waved just 34.bxa6 star docker mitigate is any other ring true mack?

Qb8 romp to nap in see rook in grave b1 10 on it spread in little hook it what else appeal?

For a6 generally good club you give at choose teller susceptable it her c8 o dear in b8 almost in ko bishop corner in monster mash up rookb1 on other it you invade b7 in calms it quagmire face in slip again ba6 low in king stuck.

Changing get headache at first dip bg5 now in lovely it 34.Nf6+ Nxf6 35.Bxf6 Na7 doesnt go anywhere coast in b4 <jimfromprovidence> looks like your right enjoyable game. The machine could erradicate in h6 postpone capture in a6 I think it is black in bad call good is the knight c7 clear. Um what heading off in easy stamp a4 looks right on the money it reach in?

Premium Chessgames Member
  morfishine: White carves up Black's position with <34.Bxa6> This forces <34...Qb8> otherwise the Queen is lost. White completes the 'switch-attack' with <35.Rb1>. It was here I felt <35...Nb4> was best for Black, what-with Black being so hemmed-in and after-all, White's DSB is still hanging, so what the heck. But <36.Bb5> stops all the shennanigans

click for larger view

I stopped here figuring <37.Nf6+> is too strong and if Black tries <36...Nxd5> then then <37.Bxd7+> followed by <38.Rxb8> is completely winning for white

Premium Chessgames Member
  OhioChessFan: Took me a while. Like many others, I was fixated on the stalemated King. In my defense, I did forget it is Wednesday, not Tuesday, the holiday got me off track, and I thought there was an easier (Tuesday) solution I was missing.
Feb-22-12  Patriot: <Jimfromprovidence> <Take a look at the variation I posted earlier with 37 Bb5.> Sorry Jim...I was in a hurry this morning and didn't have time to review the posts. I must say, that is a nice line which certainly looks winning.
Premium Chessgames Member
  AylerKupp: Too bad that the latest <Rinus Award> for the best contribution or series of contributions to the <Puzzle of the Day> is restricted to non-members. Otherwise I would think that <Once> would win hands down for his <Once squint method> as described in Rybka vs Pandix, 2008.

So, after repeatedly failing to solve puzzles after Tuesday or Wednesday, I'm going to try it. I'll remove my glasses, scrunch up my face and eyes (not that anyone would notice), and find the right combination before I pass out from oxygen deprivation. Again, not that anyone would notice.

So I'm looking forward to my first 7/7 week. Assuming that I recover after Monday's puzzle.

Feb-22-12  James D Flynn: My first thought was that the threat of Nc7# would enable White to chase the Black Q: 34.Bxa6 Qb8 35.Rb1 and if Qa7 36.Bb7 Qxb7 37.Bxb7 hxg5 38.Bxc6 and White has won Q for R. However better is 35.Rb1 hxg5 36.Rxb8+ Ncxb8 37.Bb5 Rf7 38.Nc7+ Ke7 39.Qe3 or Qd1 intending to infiltrate with the Q on the Q side., and Black‘s pieces are comically tied up. My second thought was 34.Nf6+ Nxf6 35 Qxf6 to take on g6 with check and win the exchange and 2 pawns , but Qxg4+ draws by perpetual. The I realized I could try 34.Bxa8 Qb8 35. Nf6+ Nxf6 36.Qxf6 if Qc7 37,Qxg6+ Rf7 38.Bb5 wins at least a piece and 34…Rc7 35.Qxg6+ K d7 and Bxh6 win will with the g pawn while still having dire threats against the Black K.
Premium Chessgames Member
  morfishine: <James D Flynn> Nice Post! Very thorough
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