[September 13, 2017] Updated Opening Line by Trajko Nedev:
Caro-Kann Defense, Classical Variation – Main Line (Seirawan Variation without 11. Bf4)

[Line 313 : 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. h5 Bh7 9. Bd3 Bxd3 10. Qxd3 e6 without 11. Bf4]

Move 11. Bf4 is covered in our Line 314, while equally popular 11. Bd2 is the main topic of this opening line. After the usual 11. Bd2 Ngf6 12. O-O-O, Black can transpose to Line 312 with 12… Qc7, or try a sideline by opting for 12… Bd6.

The main move is 12… Be7 (followed by O-O), where White has a choice among 13. Kb1, 13. Ne4 and 13. Qe2. The overall evaluation is that Black gets good counterplay with a few accurate moves.

Black has also an interesting possibility in 11… a5, with the idea Bb4, which typically leads to positions with roughly equal chances.

[Diagram: White to Move] G. Kamsky – Y. Seirawan, Saint Louis 2012. White pieces are aiming at the poorly protected black King. How can White gain a decisive edge?

Click here to see the line in our viewer…


CO24-7_logo_black_background[September 03-26, 2017] FIDE World Cup 2017 Special Offer

Dear users and chess friends,

Late summer holiday season is about to begin for the members of Chess Openings 24/7 Editorial Board: our team will be enjoying a well-deserved break between September 3, 2017 and September 12, 2017, though most of us will actually be playing for our clubs participating in national league competitions. We will not publish new content during that period, and we shall return with a new uploaded opening line on Wednesday, September 13, 2017. Until then – enjoy our special offer on our annual package: get 14+1 months* for 99 EUR/109 USD. This offer is valid from September 3 until September 26, 2017, i. e. during the FIDE World Cup 2017 in Tbilisi.

* Purchasing our subscription during the Special Offer period will activate a 14-month subscription. To extend your subscription to 15 months, just enter our FIDE World Cup 2017 Coupon Code after the purchase and log-in. As a logged user all you have to do is enter the code given below & confirm the captcha sequence at then click on the button “Claim the Coupon” just below the Captcha field. You can claim the coupon only once during September 2017 anytime after the purchase.

Your FIDE World Cup 2017 Coupon Code is: 1085-295df48ada1

Enjoy the spectacle!

Your CO 24/7 Team


[September 02, 2017] Updated Opening Line by Bojan Vučković:
Sicilian Defense, Rossolimo Variation with 3… e6 4. O-O

[Line 425 : 1. e4 c5 2. Nf3 Nc6 3. Bb5 e6 4. O-O]

After the almost exclusive reply 4… Nge7 White has two highly popular options – 5. Re1 and 5. c3, while 5. b35. Nc3 and 5. d4 are also interesting sidelines.

If White opts for 5. Re1, Black gets good prospects with 5… Nd4 6. Nxd4 cxd4, though he should also be able to get roughly equal chances by playing 5… a6 6. Bf1 d5 7. exd5 Nxd5, as well as with 5… Ng6 6. c3 d5 7. exd5 Qxd5.

After 5. c3 a6 White has two possibilities of about the same strength – 6. Be2 and 6. Ba4 where, against any of the two, Black should generally equalize without difficulties.

[Diagram: White to Move] Black’s somewhat underdeveloped kingside allows White to seize the initiative. What would you propose for him?

Click here to see the line in our viewer…


[September 01, 2017] Updated Opening Line by Slaviša Brenjo:
Two Knights Defense

[Line 367 : 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 without 4. d3]

The quiet continuation in this variation (4. d3) is covered in Line 368, while 4. d4 exd4 5. e5 is another important option where Black gets good prospects with any of the following three moves: 5… d5, 5… Ne4 and 5… Ng4.

The main topic of this opening line is the sharp 4. Ng5 d5 line, where after 5. exd5 Black’s best reply is 5… Na5, as 5… b5, 5… Nd4 and 5… Nxd5 typically lead to better chances for White.

After 5… Na5 6. Bb5+, move 6… Bd7 is an interesting alternative to the more common 6… c6, and we recommend it to club level players. White has a choice among three possibilities after 6… c6 7. dxc6 bxc6, namely: 7. Bd3, 7. Be2 and 7. Qf3. The arising positions are generally very demanding, though Black typically has sufficient compensation for the sacrificed pawn.


[Diagram: Black to Move] White King is in serious trouble. What is the best continuation for Black that leads to a forced checkmate in a couple of moves?

Click here to see the line in our viewer…


[August 31, 2017] Updated Opening Line by Vadim Zvjaginsev:
Queen’s Gambit Declined, Ragozin Variation with 5. cxd5 exd5 6. Bg5 Nbd7 7. e3

[Line 252 : 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Bb4 5. cxd5 exd5 6. Bg5 Nbd7 7. e3]

From the initial position of this opening line, move 7… c5 is considered to be the best option for Black. White now has three good alternatives to the most common 8. Bd3, and they are: 8. Be2, 8. dxc5 and 8. Bb5.

In case of 8. Be2, Black should proceed with 8… Qa5 9. O-O c4, with the idea of Bxc3 and Ne4, exerting pressure on the c3-pawn.

Against the second of the three recommendations (8. dxc5), Black gets a decent counterplay with 8… Qa5 9. Rc1 Bxc3+ 10. bxc3 O-O 11. Nd4 Qxa2.

The same Queen move is a also good reaction against 8. Bb5, as the position arising after 8… Qa5 9. Bxd7+ Nxd7 10. O-O Bxc3 11. bxc3 O-O should be considered roughly equal.

The main line goes 8. Bd3 Qa5 9. Qc2 c4 10. Bf5 O-O 11. O-O Re8 12. Nd2 g6, where against both 13. Bh3 and 13. Bxd7 Black has sufficient resources to reach the equality.

[Diagram: White to Move] White gets a slight edge after 13. Be5, but there is a better option that should promise him a considerable advantage. Can you find the superior plan?

Click here to see the line in our viewer…


[August 30, 2017] Updated Opening Line by Bojan Vučković:
French Defense, Tarrasch Variation – Open System (Main Line)

[Line 330 : 1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 exd5 5. Ngf3 Nc6]

After the principal continuation 6. Bb5 Black can try 6… Qe7+ or 6… cxd4, but here White generally reaches better prospects without difficulties. The most common response is 6… Bd6, where after 7. dxc5 Bxc5 8. O-O Nge7 9. Nb3 occurs an important branching in the Tarrasch Variation of the French Defense.

Move 9… Bd6 leads to a dynamical position, where after 10. Re1 O-O 11. Bd3 h6 12. h3 Nf5 13. c3 White’s position is slightly preferable.

In case of 9… Bb6, the best way for White to fight for an edge is with 10. Re1 O-O 11. Be3, and after the trade of the dark-squared Bishops, White is a bit better in view of the weakness of the black d-pawn.

[Diagram: White to Move] R. Lutzenberger – A. Silva Filho, corr. 1998. How would you evaluate the position arising after 20. Nxe4 dxe4 21. Ng5?

Click here to see the line in our viewer…