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Erik van den Doel vs Friso Nijboer
NED-ch (1997), Rotterdam NED, rd 9, Jul-01
Modern Defense: Standard Defense (B06)  ·  0-1



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sac: 33...a2 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Premium Chessgames Member
  Phony Benoni: First thought was mate, but here are too many loose ends. Well, 34. ..Rf2+ will force promotion of the a-pawn soon, and White's material is too loose to hold it all.
Premium Chessgames Member
  ChessHigherCat: The key must be that black's a-pawn could queen if only the nasty white rook weren't on f1. So, the rook needs to be deflected/diverted/sidetracked/hoodwinked or whatever the hell you want to call it with Rf2+, met by either Rxf2 a1=Q or Kxe3 Rxf1
Aug-29-17  lost in space: Easy enough.

34..Rf2+ 35. Rxf2
(or 35. Kxe3 (Kg3) Rxf1 36. Ra3 a1Q 37. Rxa1 Rxa1 0:1)

35...Qh1 36. Rxe3 Kxb6 0:1

Black is the equivalent of 4 pawns ahead.

Aug-29-17  stst: just take a bet, make the a-P queen, sac the R: ......Rf2+
if RxR a1=Q
if KxP RxR

[don't bother the seq.#, just ideas...]

Premium Chessgames Member
  patzer2: A double attack (i.e. Rook Fork,) with 34...Rf2+ -+ (-19.27 @ 26 depth, Stockfish 8) wins decisive material and solves today's Tuesday puzzle.

Best play is apparently 34...Rf2+ 35. Rxf2 a1=Q -+ (-50.10 @ 29 depth, Stockfish 8.)

For a White improvement, I like 9. e5 ⩲ (+0.43 @ 28 depth, Stockfish 8) better than the game move 9. Be2. The problem with 9. Be2?! is it gives Black a lasting advantage after 9...b4 ⩱ to = (-0.25 @ 28 depth, Stockfish 8.)

Aug-29-17  Altairvega: 34 ..Rf2+ is obvious. a-pawn will be promoted..
Aug-29-17  AlicesKnight: 34.... Rf2+ is simplest. 35.Rxf2 allows queening; 35.(else) allows ...Rxf1 and queening on the a-file costing another white R.
Aug-29-17  saturn2: 34 ..Rf2 skews the white king and rook. So white has to take it. 35 RxR a1Q
Premium Chessgames Member
  whiteshark: <34...Rf2+> deflects/eliminates the back rank defender.
Premium Chessgames Member
  Willber G: <lost in space: Easy enough.

34..Rf2+ 35. Rxf2
(or 35. Kxe3 (Kg3) Rxf1 36. Ra3 a1Q 37. Rxa1 Rxa1 0:1)

35...Qh1 36. Rxe3 Kxb6 0:1>

I don't understand <35...Qh1>

Premium Chessgames Member
  Willber G: <saturn2: 34 ..Rf2 skews the white king and rook. So white has to take it. 35 RxR a1Q>

Sorry to be pedantic, but the word is 'skewers' not 'skews'.

Also, in this case it is a fork not a skewer.

Premium Chessgames Member
  malt: 34...Rf2+ deflects
<ChessHigherCat> <the nasty white rook>
Premium Chessgames Member
  Once: Not so simple as it looks. At first glance, we might think that the game ends when we queen our a pawn. So let's start with the fairly obvious 34...Rf2+

click for larger view

This either wins the white rook on f1 or deflects it from protecting against a1=Q. So far so good.

But then we need to count pieces. White starts the puzzle a knight up. Black then gives up a rook in order to force the coronation of his a pawn. That means that black is investing a rook, a knight, and a pawn in order to get a queen.

When we first learned to play chess we learned that a queen is worth either 8 or 9 points. A rook, knight and pawn are also worth around 9 points. All other things being equal, that's a fairly level trade ... if white can hold on to all of that material.

We need to roll on a few moves. After 34...Rf2+ 35. Rxf2 a1=Q, we get to here:

click for larger view

If white could gather all his pieces together he might still be in this game. He has two rooks and a knight against a queen and rook. But the salient point is that two of white's pieces are attacked and they are all poorly coordinated. White can save one of his attacked pieces, but not both.

Sometimes we get a little overexcited when we win a queen or promote a pawn. We need to check whether our opponent doesn't get enough material in return. In this puzzle, the win doesn't happen solely because we've queened the a pawn. The win happens because white has two pieces en prise. The promotion is incidental.

<Phony Benoni> aced it by saying "White's material is too loose to hold it all."

Premium Chessgames Member
  patzer2: <Once> Excellent assessment and description of the tactics involved with 34...Rf2+!, which overloads (a.k.a. overworks or overtasks) the White Rook on f1 and secures decisive material with a pawn promotion and an unusual double attack after 35. Rxf2 a1=Q -+.
Aug-29-17  zb2cr: 34. ... Rf2+. Now, White can pick his poison:

35. Kxe3, Rxf1. Black, from being a Knight down, is now up by the exchange.


35. Rxf2, a1=Q. Now, White is close in material: 2R+N+4P vs. Q+R+5P. However, he has both a Rook and a Knight <en prise>. Most likely he saves the Rook by 36. Kxe3, Kxb6 and then Black is ahead by a straight Q vs. R.

Aug-29-17  DrGridlock: 34 ... Rf2 is the most direct win,


34 ... d4 or
34 ... e2

are also winning.

Not sure why I spent so much time looking at getting e2 to work instead of Rf2, but wins e2 does.

Premium Chessgames Member
  offramp: EVERYBODY needs good Nijboers.
Aug-29-17  Cheapo by the Dozen: I made this harder than it needed to be. I saw the correct move immediately, but then assumed Black would recapture at f2 and try to queen a pawn afterwards. Whoops.

Figured it out eventually.

The material works out big because Black immediately is up Q for R+N, and White also has 2 pieces en prise.

Premium Chessgames Member
  ChessHigherCat: I don't object to this game as a puzzle, per se, but the background information is shockingly inaccurate. This game was actually played in 1162 when Barbarossa invaded Milan. Tired by the long and costly siege, the two sides decided to entrust the outcome of the war to their two best chessplayers, Erick van de Doel, a Dutch mercenary enlisted by Emperor Friedrich, and Heiko Demario, a Milanese yoyo merchant of Filipino-Italian descent. The game was subsequently immortalized in a song brought home to England by a Welshman whose memory for lyrics was unfortunately not the equal of his remarkable physical prowess:

[to the tune of Farmer in the Dell]

Erik van de Doel,
Erik van de Doel,
Heiko de Mario,
and Erik van de Doel.

Aug-29-17  Altairvega: It seems to me, it is like the theme of this week, to give a rook in order to win either immediately (Monday) or slowly but decisively (Tuesday) Let us see what it happens on Wednesday..
Aug-29-17  wtpy: In your line 36 Ke3 is not best met by Kb6 but Re8+. If white plays 37 Kd2 37..Qb2+,if Kf3 then 37.. Qh1+ 38 Kg3 Qg1 39 Rg2 h4+ 40 Kh3 Qf1 which attacks one rook and pins the other and mates in a couple more moves. If white wants to play on after Rf2+ taking black's e pawn with Re3 seems best, and then I don't see anything besides Kb6,which is plenty good.
Aug-29-17  leRevenant: <Phony Benoni> aced it by saying "White's material is too loose to hold it all." here here
Premium Chessgames Member
  kevin86: Multiple threats wins it for black.
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