Tuesday, May 29, 2012

Blackmar-Diemer Ryder "Refuted?"

Jocelyn Bond comments about whether the Ryder Gambit (1.d4 d5 2.e4 exd4 3.Nc3 Nf6 4.f3 exf3 5.Qxf3) and asks whether it has been refuted by 5...Qxd4 6.Be3 Qg4 7.Qf2 e5?

"This e5 variation is a refutation of the Ryder? 2 pawns up, it is big material advantage.
I think in the other variations...i think about
5...Nc6 6.Bb5 seems ok for White
5...c6 6.Be3 is often played against me and
5..e6 6.Bf4 (6...Qxd4? 7.Nb5 is strong) 6...Bd6 7.Bg5 seems standard here
5...g6! 6.Bf4 seems to be a good plan for black. but i like to place my bishop on e5....
Anyway Tim you are very kind to do a blog on the Ryder accepted...
I heard about the Schiller book but nothing more... it seems excellent... Do you know if he says that the ryder is refuted by Qxd4?"

"Refuted" in chess opening terminology has to do with theory or evidence. Basically, a variation is refuted if: when you play it, you lose.
There are three types of "refuted" variations:
1. When computer analysis overwhelmingly favors your opponent's side.
2. When the performance ratings are significantly below expectations.
3. When you lose regularly with this variation against your opponents.

Let's look at each one individually in regards to the Ryder Gambit and 7...e5 line.
1. Computer analysis favors Black, but not quite by two pawns. White usually has compensation for only one of the two pawns sacrificed. That is bad for White.
2. Performance rating for the Ryder is above expectations, but after 7...e5 below. 5.Qxf3 scores 60% with a performance rating +52 points above actual rating (1346 games), but after 7...e5 White scores 47% with a performance rating -42 points below actual rating (272 games). This means about 1 in 5 players as Black have followed up 5.Qxf3 with all three moves, Qxd4/Qg4/e5. Those who play this way have scored well with Black. In the games where the other four players varied, White did well.
3. Are your opponents likely to regularly find very good moves for Black? The higher they are rated, the more likely they are to know this stuff. Diemer was still winning with the Ryder Gambit in his 80s, so there is practical value, along with real risk.

One author that recommends 7...e5! for Black is IM James Rizzitano in his book "How to Beat 1 d4" ("A sound and ambitious repertoire based on the Queen's Gambit Accepted"). Rizzitano sites a few games as examples, the first one being Alex Lane - Tim Sawyer, played in one of Tom Purser's thematic BDG tourneys in 1997. Lane chose 8.Be2. Better seems to be 8.Nf3 or 8.a3, but Black stands better in theory. To sum up I quote International Master James Rizzitano again: "The Ryder Gambit is unsound and the reader should be extremely sceptical of any claims to the contrary."

Lane-Sawyer, corr BDG thematic (2), 1997 begins 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Qxf3 Qxd4 6.Be3 Qg4 7.Qf2 e5 8.Be2 Qf5 9.Qg3 Bb4 10.0-0-0 Bxc3 11.bxc3 0-0 12.Bd3 e4 13.Bc4 Qa5 14.Ne2 Be6 15.Bb3 Bg4 16.Bd4 Nbd7 17.Rhe1 c5 18.Bxf6 Nxf6 19.Rd6 c4 20.Bxc4 Bxe2 21.Bxe2 Qxa2 0-1


You may also like: King Pawn (1.e4 e5) and Queen Pawn (1.d4 d5)
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5 comments:

  1. Eric Schiller wrote on the Ryder and indicated that he found Ryder Gambit is refuted due to two strong moves... but each time White didn't play the best way according to me !

    He up-dated his book on Amazon.com where you can check 12 pages.

    ReplyDelete
  2. I think that after 5...Qxd4 6.Be3, even stronger than 6...Qg4 7.Qf2 e5 is Mark Nieuweboer's suggestion 6...Qh4+ 7.g3 Qb4, where White's pawn on g3 prevents White from playing Qg3. I've looked at this line and haven't been able to find anything remotely convincing for White. Another problem is that if Black refrains from taking on d4, White is often worse off having a queen, rather than a knight, placed on f3.

    ReplyDelete
  3. I usually play 7.Nb5... Tom Purser had an article on it in BDG World #64, beginning on page 96. It came out in1994.

    Quentin

    ReplyDelete
  4. 7.Nb5!? is certainly an interesting try that worked well in that BDGW article by Jerry Flowers. Hope you have fun with it!

    ReplyDelete

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