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John Grefe vs Arnold Denker
"Dubious Double DIRP Defense Dooms Denker" (game of the day Aug-07-2019)
Lone Pine (1979), Lone Pine, CA USA, rd 1, Mar-25
Caro-Kann Defense: Breyer Variation (B10)  ·  1-0



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Kibitzer's Corner
Feb-04-13  jerseybob: Grefe's 4.f4!? is the kind of gambit one might expect from Denker himself. With 4..Qxf4 Denker says "Show Me" and Grefe says "I will". Not that this is a forced win for white; far from it. Black's defense seems suspect at several points, but defense was never what Arnold Denker was about.
Dec-24-13  DoctorD: From his Chess Tactician's Handbook:

"I had White and the game began 1. e4 c6 (the tactician's nemesis) 2. d3 d5 3 . Nd2 Qc7 I had actually been toying with this line in my pre-tournament preparation and couldn't resist the temptation to play the gambit idea I had come up with. 4. f4?!! It's probably completely unsound, but not totally ridiculous. After the further 4. .. Qxf4 5. Ngf3 Nf6 6. Nb3 Qc7 7. e5 I won rather easily and was awarded the prize for best-played game of Round One."

Premium Chessgames Member
  OhioChessFan: 7...Ng4 deprived Black's LSB of its best square. I have to think 7...Ng8 was better.
Dec-26-13  jerseybob: OhioChessFan: A very Steinitzean suggestion, and maybe a dour defensive expert like Steinitz could pull it off, but the "un-dour" Denker?
Premium Chessgames Member
  GrahamClayton: Both White's bishops capture a knight on h6 and a6 respectively.
Aug-07-19  sfm: 22.Qg8+! ends it instantly, instead of 22.Qxf7+?? Easy detail to miss. But there was no defense, also 20.-,Rb7 21.Ng6 is over. A very interesting and unusual game.
Premium Chessgames Member
  An Englishman: Good Evening: After 40 years, still the only 4.f4!? in the database. Evidently everyone else considers it "completely unsound." On the other hand, it only had to work once.
Aug-07-19  Cheapo by the Dozen: If the engine is to be believed, 7 ... Ng8 leaves White with a little advantage, and so does 5 ... e4. Declining the gambit also doesn't look great. So if 4 f4 is unsound, I don't yet see why.
Aug-07-19  siggemannen: Today's pun makes yesterday's seem like a bad acid trip
Aug-07-19  Nosnibor: Denker came to grief by accepting Grefes gambited pawn.
Aug-07-19  areknames: I love 4.f4, what a wonderful move.
Aug-07-19  cormier:

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Analysis by Houdini 4 d 23 dpa done

1. = (0.14): 8...e6 9.h3 Nh6 10.Bxh6 gxh6 11.Bd3 a5 12.a4 c5 13.Nxc5 Bxc5 14.dxc5 Qxc5 15.Qd2 Bd7 16.c3 Nc6 17.Bc2 b5 18.axb5 Qxb5 19.Ba4 Qc4 20.Bxc6 Qe4+ 21.Kf2 Bxc6 22.Rhe1 Qg6 23.Kg1 Rg8 24.Nd4 Bd7 25.Qe2 Qg3 26.Kh1 a4 27.Rf1

2. = (0.25): 8...a5 9.a4 e6 10.c3 Bd7 11.h3 Nh6 12.Bxh6 gxh6 13.Bd3 c5 14.dxc5 Bxc5 15.Qd2 Be7 16.Nbd4 Nc6 17.Nb5 Qb6 18.Qxh6 Rg8 19.Qd2 0-0-0 20.0-0-0 Kb8 21.Kb1 h5 22.Rhf1 Qc5 23.Bh7 Rg3 24.Bc2

Premium Chessgames Member
  Pawn and Two: Houdini 3 indicates an advantage for Black with each of the moves: 5...e6; 5...Nd7 & 5...g6.

Of these moves, Houdini 3 prefers 5...e6, (-.43) (31 ply) 5...e6 6.e5 Qa4 7.Be2 Ne7 8.d4 c5 9.dxc5 Ng6 10.Nb3 Nc6, or 9...Nbc6 10.Nb3 Ng6.

Stockfish 9 also indicates an advantage for Black with each of these moves: 5...g6; 5...Nd7; or 5...e6. See analysis on this game page by Stockfish 9, as provided by

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