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Mark van der Werf vs Friso Nijboer
ch-NED (2001), Leeuwarden NED, rd 8, Jun-29
Gruenfeld Defense: Exchange. Spassky Variation (D87)  ·  0-1
ANALYSIS [x]

FEN COPIED

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sac: 32...Rxd7 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Dec-18-15  dnp: for a Friday, it was quite simple.
Dec-18-15
Premium Chessgames Member
  al wazir: 31...gxf3 32. gxf3 Qe3+ 33. Kd1 (33. Ke1 Rg1#) Qxf3 34. d7 Rxd7 35. Rxd7 Qh1+ 36. Kc2 Qxe4+.

I admit that I didn't see this all the way through when I looked at the puzzle position, but it's the line I would have played. I think it's as good as the game line.

Dec-18-15
Premium Chessgames Member
  morfishine: <32...Rxd7> followed by <33...gxf3> looks fairly routine

*****

Dec-18-15
Premium Chessgames Member
  Cheapo by the Dozen: Just like Thursday's puzzle, this one seems super-easy for this late in the week, because there aren't many things to try.

32 ... Rxd7 (only way to stop the pawn)
33 Rxd7 gf (obvious try; only need to check whether the only obvious counter-try works) 34 Rg1 Qxg1
35 Nxg1 f2 (luckily, the pin in this case didn't win after all)

The last tactical point is that White's knight is effectively trapped, in that it will be lost to a queen fork within a few moves.

Dec-18-15  goodevans: <morfishine: <32...Rxd7> followed by <33...gxf3> looks fairly routine>

I saw those two moves and thought "this is all a bit too easy" so 1 looked a bit closer and saw the <34.Rg1> pin. A few more seconds to check that black still has a win after <34...Qxg1> and I was done.

Not exactly difficult but 1 think you have to see all the way to <35...f2> to claim full credit.

Dec-18-15  sfm: There's a little rule, obvious but handy, to realize here:

If your unblocked and unthreatened pawn on your 7th rank threatens an opponent's knight then queening can't be stopped.

The knight is especially unfortunate in this matter. In any other case the pawn can be prevented from queening by being captured or blocked by the threatened piece[*].

(Of course exceptions apply is if the kings legally gets involved somehow, by checks or bindings etc.)

Here white resorts to the checks, but they run out.

[*] OK, the exception from [2] is if the pawn forks two rook/knight on the 8th rank.

Alekhine makes good use of this rule twice in the truly amazing game Bogoljubov vs Alekhine, 1922

- - -

35 years ago OMG I had this:


click for larger view

Black to move. White is certainly winning, but it was shortened by 1.-.Kf7? 2.Sd8+. Black resigned, as 2.-,Ke7 3.NxN,KxN 4.f5+ is over too. All you really need is luck!

Dec-18-15
Premium Chessgames Member
  morfishine: <goodevans> FWIW: I did; yesterday's puzzle actually helped me with this one, what with both having a slippery pawn maneuver

*****

Dec-18-15  wooden nickel: I loved 34.Rg1 QxRg1! 33... Qxh2! is also cute!
Dec-18-15  CHESSTTCAMPS: Black has Q+P for N+R, a substantial material advantage. It is true that black must spend a rook to stop a pawn from promoting, but black's queen is ideally placed to harrass the white king and black has ascending pawns of his own.

32.... Rxd7!

Black only needs to make a short calculation before deciding that chopping it off is the simplest approach.

33.Rxd7 (Rg1 Rxd5+ 34.exd5 Qxf3 is winning) gxf3! and now

A) 34.Rg1 Qxg1 35.Nxg1 f2 36.Ne2 (Nh3 f1=Q traps the knight) f1=Q and the threat of f3 is unstoppable.

B) 34.Re1 f2 35.Rxa7 (Re1 moves f1=Q+ also wins the rook) fxe1+ 36.KxQ f3 wins.

C) 34.Rxa7 Qxe2+ 35.Kc1 f2 checkmates after spite checks.

Time for review...

Dec-18-15
Premium Chessgames Member
  offramp: Everybody Needs Good Nijboers.
Dec-18-15
Premium Chessgames Member
  thegoodanarchist: Did anyone remember this puzzle from 11 years ago?
Dec-18-15  PJs Studio: I actually got this one. Although not TOO tough because blacks position is pretty desperate!
Dec-18-15  dfcx: First tried 32...gxf3 33.d8=Q+ Kh7 34.Re1 and black can't recover from the material disadvantage.

This forces black to deal with the pawn right away.

32...Rxd7 33.Rxd7 gxf3

A) 34.Re1 f2 35.Rd1 f1=Q 36.Rxf1 Qxf1 and the second pawn is still coming down,

B) 34.Rg1 Qxg1! 35.Nxg1 f2 and promotes next

Other moves? 34...Qxe2+ followed by f2 to promote.

Dec-18-15
Premium Chessgames Member
  offramp: <thegoodanarchist: Did anyone remember this puzzle from 11 years ago?>

I did.

Dec-18-15  Virgil A: Not that difficult really. 32...Rd7 is a forced move.
Dec-18-15
Premium Chessgames Member
  Tiggler: <jith1207: .... I hope I get one day patience to go through all lines carefully and take time to solve a weekend puzzle cleanly.>

When I was a kid and had just started playing chess, I noticed that others always said, as a put down or an excuse, "I haven't the patience".

Dec-18-15
Premium Chessgames Member
  thegoodanarchist: < offramp: Everybody Needs Good Nijboers.>

Which can be abbreviated as "Gooboers"

Dec-18-15
Premium Chessgames Member
  kevin86: Black sacrifices queen and rook to make a super-passed pawn and end up queen for rook and knight and... two pawns ahead.
Dec-18-15
Premium Chessgames Member
  tamar: Like a good neighbor, Friso did not give a discount double check.
Dec-18-15
Premium Chessgames Member
  chrisowen: Vagabond towers take in d7 and wins diligent ramble give spark an push to pit kit d7 in flack again diligent ramble among d6 stay add ive put and towers give at i g1 erm black still ahead can take at f3 infer tile ground at win in jib caught i again d7 agog lady it's good again d6 better at hold and what else then key jib caught quiff free on we have sput hih i national dip have mag viktor glide then ave vagrant agile gold ok know man win in mush pin hand dissipate again spin off in spot punt man hand mag viktor glides hang ah i nag sag hand game vice kaputz in zip ave then am flurry it zag away angle spam maps hand go ok gander vice punt tow would tangle sput span touch augers well lute won you bank it d7 in tune would ave then ive spot wulf energy rates encircle neep tide win in flurry it dint sput law info nest info ok of in kneel enterprise it sense in slim for ebullient ramble give sparks i again d7 and good ive info free frequency another bind ave quiff fog god blag too band job icicles band jig jib caught d7 agog too quiffs g7 slide agile an we rove on at have sput hand mag viktor glide mind rove sage sputter lady it's good again for black quad ables age man boo to boot d7;
Dec-18-15
Premium Chessgames Member
  chrisowen: ive win boon at boon boogie boolean factor at live toast tomb ive get able tour an told tool tonto to gain am rave network nag win miff info vent hive flap quirk band fab bit low ave learn tiff any glass seal wax a cut i curry favour ave in blew awhile an dive g7 slide agile across d7 among idle wind guise it sense in safe jonty and tonto able boot eg nip in vet da vows an ford d7 river agile infer tile ground at win 0l free wow winch moved it edict have win aids nimble go build gannets and gunner g7 double vent an gangwalk am call i i captain pug too verdicts nubile under v ash bad lined it edge vent good easy viktor ave lid for one on flight ash camp i guffaw heartily am cad i delve trys deeps act each as cad to cap again slides g7 ash call clink i et tu brute brute at hood wind in oomph cutoff point in besets am path d7 and bone a5 of alma man contention am for best try b4 am among a6 and i b2 it low ave learn all good but bade a5 forth am bad call among an dug and churlish behaviour i do at every am good delve line fetch eg win infer tile ground ish farm i affable lady it's good again am g1 after glide infer free foot soldier go f3 er fold in and black at win fans call i wag camp i co determine lines better aim b4 old bade a5 take aether and bad acker ala it show in boat again shin down bag at tell forgers all aids duo amps try acts fatefuls again learn am bone a5 of alma contention as palm aether bind tort tart again creative gesture castle goodness me goes well behind then am among dipoff able heads i flack g7 line glean lips beset aim gold rush i et al in heaven g7 slids gangwars i do at creak er go creep free clink cast a5 bade beset a6 or i b2 it low ave learn band banal ive ash head i dipoff affable go build castle deadly d7 i go at push d7 ash 0l 32...Rxd7;
Dec-18-15  Sniffles: Now this is a cute conundrum! Let's call this Machiavellia's last stand.

First I must get rid of that pawn threat. No problem.

Now my young Jedi on G4, you are my only hope. So let's set up a sucker trap. A queen pin too tasty to refuse.

There! That other pesky rook is gone. Onward and may the force be with you, little pawn.

All black has to do is keep that rook off the G file.

Dec-18-15
Premium Chessgames Member
  Marmot PFL: All looked forced to me, and not too hard to find (when you know it's a puzzle).
Dec-18-15
Premium Chessgames Member
  gawain: All logical--but still pretty deep.
Dec-19-15  stst: Step overtime, but thought that ....gxf3 would have advantage, despite of the imminent promotion of White's d7 P.
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