Nernstian59 wrote on 11/20/23 at 22:07:34:

Looks like Krishnater's course was included in the recent expansion of Chessable's Black Friday sale.

kylemeister wrote on 11/21/23 at 15:35:01:


Thanks for mentioning it. His May 2022 article is very relevant to this thread.

We've had several excellent contributors for the 1d4 d5 section at ChessPublishing. The November 2023 update is from GM Nigel Davies. It so happens that the Kindle book I looked at most recently is his book The Queen's Gambit Declined Move by Move.

The ...c4-c5 structure is indeed the Panov structure as it can come about from the Panov-Botvinnik attack in the Caro-Kann. Those lines are probably not as prominent now in the Caro-Kann as when Soltis wrote his book, but it's still worth remembering that it's the same thing (with differences).

Nernstian59 wrote on 11/20/23 at 22:07:34:


Thanks for the explanation and link.

I have considered the Manhattan variation from time to time. Here's a typical sequence:

1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Nbd7 5. Bg5 Bb4 6. e3 c5 7. cxd5 exd5 8.Bd3 Qa5 9. Qc2 O-O 10. O-O c4 11. Bf5 Re8 12. Nd2



Barsky, in his book The Ragozin Complex, used the words "majority attack" to describe Black's early c5-c4.

I've sometimes thought of the Manhattan as being a Cambridge Springs variation with Black saving a tempo by playing ...c5 in a single go. However, matters are not so simple. One commonality between the two lines is that Black delays the development of his queen bishop, compared to the Tartakover variation.

The historic main line continues 12...g6, which forces White to decide between 13Bxd7 and 13Bh3. After 13. Bh3 Bc3 14.
bc3, Black is ok. However, Karpov improved with 14Qxc3! After the trade of queens, Black lacks dynamic play.

Barsky considered 13...Kg7!? which surprised me, but may work. I looked at 13...Bf8, intending ...Bg7 with pressure on the d pawn in case of e4. However, it does not appear to work.

Going to Chessgames.com, I notice that Erigaisi has deviated earlier. One blitz game continued 12...h6 13Bh4 Qa6. Perhaps 13...Qb6 is also possible. After an eventual a3 the typical Manhattan/Nimzo move is ...Bxc3. However, ...Ba5 may also be possible.

Perhaps 12...h6 is part of  Krishnater's repertoire. Sometimes simple deviations have a great impact. Karpov's 14Qxc3 and perhaps a new move on move 12 will make a difference.

I think that both the Ragozin and Vienna (I like 8...Qa5 as recommended by Pert) are doing ok. Perhaps these lines could be options in Krishnater's repertoire.

CanadianClub wrote on 11/15/23 at 15:10:43:


Thanks for posting. I'm glad to see something on the Manhattan variation. The free short and sweet introduction offers less sample material than most other S&S introductions at Chessable. The link to the course provides more information.

https://www.chessable.com/1-d4-d5-krishnaters-killer-repertoire/course/177839/

I've never known exactly how to read the "Variation details." For example:
"27 x 19) Gukesh QGD - Main Line (17.11 avg depth)"

What does 27x19 mean?

I'm in the dark on the recommended repertoire. I don't know how his coverage on the Manhattan differs from existing theory. I don't know anything about the Gukesh QGD, and so on.

I expect it's a good course, but I usually have a better idea of what I'm buying at Chessable before I buy. Then again, Chessable usually provides more information than did traditional publishers of the past.

Note that:
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cd5 ed5 5. Bg5 Bb4 6. Qc2 transposes to a line of the Nimzo-Indian Defense.

GM Justin Tan, ChessPublishing April 2022, covers the game Bok, B. (2624) Abdusattorov, Nodirbek (2661) which commences:

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cd5 ed5 5. Bg5 Bb4

I don't know if this is an accelerated Ragozin or an Exchange variation QGD, or both. The game and analysis are definitely worth a look by subscribers.

MarinFan wrote on 01/18/17 at 23:09:02:


Yes, indeed. Pert does not allow any transposition to Botvinnik-Capablanca. I don't have Cornette's book, but am confident that he does not allow a transposition either.

The Dangerous Weapons line on the Queen's Gambit Declined exchange variation is similar in spirit, but crucially differs in details. In both cases there are many lines, so it gets confusing. But this might illustrate:
DW:
1d4 d5 2c4 e6 3Nc3 Nf6 4cxd exd 5Bg5 Bb4
Accelerated Ragozin:
1d4 d5 2c4 e6 3Nc3 Bb4 4cxd exd. Now white can not play 5Bg5 as the black knight is not yet on the f6 square.

However 5Bf4 remains an interesting option. It resembles the Alortsev variation somewhat, but generally does not transpose.

I've looked at the Qa4 line, which I thought was supposed to be the refutation of Bb4, but Black seems fine.

I have real problems against the Ragozin variation, so the transposition to the Nimzo lines mentioned above are definitely appealing.