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Max Blau vs Jan Hein Donner
Clare Benedict Cup 05th (1958), Chaumont Neuchatel, rd 3, May-13
Sicilian Defense: Canal Attack (B51)  ·  1-0



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find similar games 1 more M Blau/J H Donner game
sac: 34.Rxd6 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Dec-04-14  araodin: Fantastic puzzle! White to play... but who plays is Blau (Blue in German) and the things went Red to Black. An unexpected Queen trap: he didn't see Bf4 after his move 36...Qxe5
Premium Chessgames Member
  Penguincw: 34.Rxd6 seemed to be the only obvious sacrifice, and it was the one.
Dec-04-14  wooden nickel: Black was actually doing fine until 33. ... Qa6?, instead 33. ... Qb2, if 34. RxBd6, then just QxBc2

click for larger view

with still nice play for Black since White's pawn on e4 is weak!

Dec-04-14  PerpetuallyChecked: New Member - First Kibitz . . . wish I could say I got this one, but I fell into the same wormhole as <arun.pulak>. Honestly though, my batting average falls precipitously on Wednesday. . . (thank you all for growing this awesome website!)
Dec-04-14  hms123: <<Announcement of Rinus Award>>

We typically try to make an award four times a year. In general, first priority for a <Rinus Award> goes to a non-premium member who makes an excellent contribution to one of the <World vs. GM> games hosted by<>. When there is a break between games, and on a few other similar occasions, the committee has made an award to someone on another part of the website who has made excellent contributions in that area (e.g., <ChessBookForum>,POTD page).

Among the many superb candidates contributing to the POTD discussions, three stood out. Not only have they made consistent, excellent analytic contributions, they also represented the best of <> in their conduct and in their contributions to the creation of a healthy atmosphere at <>.

It is with great pleasure that User: WinKing User: kutztown46 User: morfishine and I announce that both User: Cheapo by the Dozen User: patzer2and User: gofer will be receiving <Rinus Awards>of year-long premium memberships as soon as they are activated. I have already notified the administrators.

It is nice to see that the group includes one relatively new contributor and two long-time contributors. It is a pleasure for us to recognize all three. Our thanks go to all of you who are regulars at the POTDpages. You set a terrific example of what a chess community should be like.

Dec-04-14  hms123: <<<Rinus Award>>> (Post 2 of 2)

For background on the award:

< <The Rinus Scholarship> For several years, User: chesstoplay (Peter) devised and managed "The Rinus Scholarship", an effort designed to give premium memberships to people who contribute to the World Team's success. The Rinus Scholarship is named in memory of the Chessgames member User: rinus who passed away in August of 2008. Rinus was the first recipient of this award, and remains a shining inspiration to the World Team.

Sadly, due to health problems Peter can no longer continue this effort. Fortunately, some members stepped forward to take over the job. To help ensure its success, we have now incorporated the RinusScholarship directly into our website, allowing anybody to donate a premium account directly to the fund. This fund will then release premium accounts to members of the World Team, at the judgment of the new managers.

From time to time you'll be seeing a small banner ad to the left of the board soliciting donations. The proceeds from donations made to this fund will not only purchase a premium membership for a deserving user who may not otherwise be able to afford one, but also will go into a special account used to finance future Chessgames Challenges. In this way, we hope to hire the very finest grandmasters in the world to step forward and take the challenge. So each dollar donated serves two purposes: you put a smile on somebody's face today, and in the future you put a smile on thousands of people's faces when a new Chessgames Challenge begins.

If you are able, please consider donating to worldwide chess learning through the Rinus Scholarship. Either click on the banner ad when it comes around, or better yet, click on this link right now to make a donation:

Dec-04-14  hms123: As a long-time lurker on the <POTD>, I would like to add my personal thanks and congratulations to all three <Rinus> winners. You have all done much to make the site better.


Dec-04-14  Sally Simpson: Ah the Old Queen trapped with no retreat trick.

Pulled this off in a recent game as Black.

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White is threatening to win an important pawn with Bxe4 so using that as bait I set my wee trap with 1...Bf6

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Covering the squares g5 and h4.

Black took twice on e4. 2.Bxe4 fxe4 3.Qxe4 and Bingo.

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3...Bf5 A Queen is speared. 0-1.

Premium Chessgames Member
  kevin86: Wow! The queen is trapped in the middle of the board!
Dec-04-14  WinKing: Congratulations to <Cheapo by the Dozen>, <patzer2> & <gofer> on having won the coveted Rinus Award. I visit this forum occasionally & enjoy checking out the various member's solutions to the puzzles. No better way to keep your game & mind sharp IMO.
Premium Chessgames Member
  Jimfromprovidence: <gofer> In your line 34 Rxd6 Qxd6 35 fxe5 Qd8/Qe7 36 Bg5 , assuming 35...Qd8 36 Bg5, black has 36...Qb6+.

click for larger view

Dec-04-14  R. P. Musante: About the Quote of the day. Reuben Fine speaks about lifeless mathematical problems as opposed to combinations in chess. With all my respect to GM Fine I must say that in my opinion he made an inaccurate, though commonly accepted assertion. I would like to know what would have said about this the great Em Lasker who was also a mathematician. To prove certain theorems one only needs effort and patience but this happens in many chess games too. However, I believe that fine professionals in the mathematical field around the world (and there are many in New York State) would agree with me in saying that there are other proofs that deserve, as some people say, to be written in the BOOK of GOD. Ingenuity, simplicity and creativity are neccessary to arrive at certain incredible mathematical results and these are also the spices that brilliant combinations require.
Dec-04-14  CHESSTTCAMPS: Material is even in this semi-closed position, with white's initiative in the center countering black's rather useless control of the a-file. Black on the move might get promising play with Bg4, but white on the move has a winning shot:

34.Rxd6+!! Qxd6 35.fe Qe7 (Qxe5 36.Bf4! traps royalty in the middle of the board [yesterday's theme?]) 36.Bg5! followed by 37.Bxf6 and white will invade the dark squares if black cares to play it out.

Dec-04-14  Lighthorse: <R. P. Musante...there are other proofs that deserve, as some people say, to be written in the BOOK of GOD.>

One of the favorite books that I own is "Journey through Genius: The great theorems of Mathematics" by Wm. Dunham.

But I have a better chance of luckily falling into some genius combination on the chessboard than I do of creating a great Math proof! Unfortunately not today -- missed the queen trap!

Dec-04-14  CHESSTTCAMPS: An excellent point by JimfromProvidence in his diagrammed position showed me that I should have analyzed 35... Qd8 as well as Qe7. See

Check out what happens after 37.Be3.

Dec-04-14  gars: <R.P.Musante>: Your are right. There is a lot of beauty in some mathematical theorems. Besides that, the first mathematician to mention the Book of God was Paul Erdös (1913-1996) and some of his results seem to come from that book. Another example is Edward Nelson's proof of Liouville's Theorem on analytic functions that you'll find at volume 12 (1961) of the Proceedings of the American Mathematical Society. Try it!
Premium Chessgames Member
  Jimfromprovidence: <CHESSTTCAMPS> Phil, long time no see!
Dec-04-14  TheaN: Not gonna add much to what has been said on this PotD. I did visualize 34.Rxd6 Qxd6 35.fxe5 Qxe5, and for a long while went for 36.Bd4 with Nf3, until I realized 36.Bf4 actually traps the queen.

I wouldn't say the position after 35....Q moves 36.exf6 is downright won, so I stopped analysing there. White accomplished to remove two of black's important pieces, is up two pieces for a rook and will eventually win.

Dec-04-14  CHESSTTCAMPS: Visitors might enjoy trying to win the puzzle position against best defense - or not.

Good luck!

Dec-04-14  cfountain: Donner Party.
Premium Chessgames Member
  patzer2: <hms123>< WinKing User><morfishine> Thanks guys for the selection of <Cheapo by the Dozen>, <gofer> and myself for the <Rinus> award to include a year's premium membership.

I thoroughly enjoy the online community and appreciate the recognition for making a positive contribution.

Premium Chessgames Member
  patzer2: Missed yesterday's Thurssday puzzle by one move. Like <TheaN> I saw <34.Rxd6 Qxd6 35.fxe5 Qxe5> and went for <36. Bd4?>. Unlike <TheaN> I didn't see 36. Bf4! trapping the Queen until after I looked at the solution.

Peeling back the onion a bit on this combination, Black can play stronger and avoid the loss of the Queen with 35...Qd8 36. exf6 Qxf6 (diagram below)

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A similar position is arrived at after 36. Bd4? (missing 36. Bf4! ) 36...Qd6! 37. e5! Qa6! 38. exf6 (diagram below)

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Now at first glance, with identical material and similar piece placement, you might think White's no worse off in the second line. However, that's not the case.

There's a slight but important difference. In the second position, Black can play 38...Qa1! with drawing chances after 39. Nf3! (39. Bd1 Qc1 40. Nf1 Ra1 41. Ne3 Bg4 42. Nf1 Be6 43. Ne3 Bg4 44. Nf1 Be6 =) 39... Qxe1+ 40. Nxe1 Bd5 (+0.79 @! 24 depth per Fritz 12).

Premium Chessgames Member
  patzer2: Of course the analysis above begs the question exactly how does White win after the stronger Black play 35...Qd8 36. exf6 Qxf6 (diagram below)?

click for larger view

Playing it out against Fritz 12 gave the following result with me occasionally forcing Black's move to avoid computer moves human's wouldn't play:

37. Bd4! Qg5 38. Nf3 Qh6 39. Bf6 Ra2 40. Nd4 Bd7 41. e5 Qf8 42. Qe3 Kh7 43. Kh2 Ra6 44. Qf3 Rb6 45. Qe4 Bg4 46. Qd5 Rb8 47. Nf3 Bxf3 48. gxf3 Rb6 49. Be4 Kh6 50. Qd2+ Kh7 51. Qd7 Kg8 52. Bd5 Rb8 53. e6 Kh7 54. exf7 Rc8 55. Be4 Rb8 56. Qd5 Qh6 57. f8=Q Rxf8 58. Qd7+ Kg8 59. Bd5+ Rf7 60. Qxf7#.

P.S.: The point is this isn't such an easy win for White following best play by Black after 35...Qd8 36. exf6 Qxf6. White must carefully and slowly coordinate his minor pieces in the center while concentrating an attack on the Black King and simultaneously keeping the Black Queen and Black Rook at bay. A strong computer program makes it look easy. For a club player like me, it's most certainly not easy.

Dec-05-14  CHESSTTCAMPS: <patzer2> <White must carefully and slowly coordinate his minor pieces in the center while concentrating an attack on the Black King and simultaneously keeping the Black Queen and Black Rook at bay. A strong computer program makes it look easy. ....> An excellent summary of the difficulty of the position.
Dec-05-14  morfishine: <Jimfromprovidence> Excellent point about <gofer>'s line 34.Rd6 Qd6 35.fe5 Qd8 36.Bg5?? Qb6+ (which, for all intents and purposes, tries be "cute" by foregoing the capture of the Knight)

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Here, 37.Be3 is met by 37...Ra1!! and White is obliged: 38.Qxa1 Qxe3+ 39.Kf1 Nxe4 40.Bxe4 Qxe4


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