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Leonid Kritz vs Nazar Firman
Cappelle la Grande (2007), Cappelle la Grande FRA, rd 6, Mar-07
Pirc Defense: 150 Attack. Sveshnikov-Jansa Attack (B07)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
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Jan-09-11
Premium Chessgames Member
  patzer2: For today's Sunday puzzle solution, 12. b4!! Qxb4 13. a4 prepares a deep combination to trap and win the Queen.
Jan-09-11  WhiteRook48: I wanted to play 12 Nd5 but after 12...Qd8 it looks like Black can survive.
Jan-09-11  310metaltrader: i really do not see a win for white at all. black has such dominant control with the remaining knights and the loss of black's dark bishop that there is no way to recover for white. a draw may be best. b4 is too premature without at least one black knight off
Jan-09-11  Marmot PFL: 12 Nd5 is so obvious that I knew it couldn't be the answer. All I play these days is 3 to 15 minute games which are mostly (more or less) obvious tactics. 12 Nd5 does win a pawn after 12...Qxd2 13 Nxe7+, or gives some advantage if 12...Qd8 13 Nxf6+ due to the weak d6 pawn. This is not easy to win however. The game line is very complicated. Black had the defence 13...e5 and then Nxe4 hitting white's queen.
Jan-09-11  schachspieler1981: Kind of got it - saw b4, a5 and the possibility of trapping the queen with Rfb1, but didn't see Black's 13..Nxd3 and 14..Qb3... But the first Sunday puzzle I've been anywhere near. :)
Jan-09-11  wals: What lost Black the game was,

13...Nxd3, +1.95. Best, e5, 0.33.

Analysis by Rybka 4 x64: ply 20 :
3 min :

1. (0.33): 13...e5 14.Rfb1 Nfxe4[] 15.Qe1 Qxc3 16.Bxc3 Nxc3 17.Qxc3 e4[] 18.Nd4 exd3 19.cxd3 Bf5 20.Rb4 Nxd3 21.Rba4 Nc5 22.Rc4 Bd3 23.Rb4 Rac8 24.Qa3 Rfe8 25.Rd1 Be5 26.g3 Be4 27.Qc3

20...f6, +5.38, didn't help.
Bd7 or Bg7 was better, +2.40.

Available for White at move 12.

1. (0.45): 12.Nd5 Qd8 13.Nxf6+ exf6

2. (0.33): 12.b4 Qxb4 13.a5 e5 14.Rfb1 Ncxe4

3. (0.32): 12.Rfd1 Qb4 13.Qe3 Nxd3 14.Bxf6 Bxf6 15.Nd5 Qxb2 16.Qxd3 Be6 17.Rab1 Qa2 18.Nxf6+ exf6 19.Rxb7 Qxa4 20.Nd4 Bc4 21.Qf3 Rab8 22.Rc7 Rfe8 23.Nc6 Rb6 24.Rxd6 Rb1+

4. (0.31): 12.Rfe1 Qb4 13.b3 Be6 14.Bf1 Rfd8 15.Rad1 Rac8 16.Ng5 h6 17.Bxc5 Qxc5 18.Nxe6 fxe6 19.Bc4 Kf7 20.Re3 Qe5 21.Rf3

5. (0.31): 12.Rfb1 Nxd3 13.cxd3 e5 14.Be3

Jan-09-11  David2009: L Kritz vs N Firman, 2007 postscript: I have read the various comments with interest. Fritz 6 managed to beat the EGT in blitz mode in the main variation (starting 12 b4!). It then managed to LOSE against the EGT in the 12.Nd5 variation despite thinking it had an initial advantage of 0.78 pawns. In effect it committed suicide by suddenly venturing on all-out attack. Possibly there was a time shortage factor involved: in a replay (overwriting its attack with a saner alternative) it drew. I have the scores of both games which I will post if there is the demand for it.

When I tried to beat the EGT unaided by Fritz 6 I ran into a brick wall, the best I could do was draw (after eliminating a few blunders). <310metaltrader: I really do not see a win for white at all. black has such dominant control ...> Exactly.

Jan-09-11  David2009: <Marmot PFL: 12 Nd5 is so obvious that I knew it couldn't be the answer. All I play these days is 3 to 15 minute games which are mostly (more or less) obvious tactics.> If you are interested in playing me on the Internet please visit my chess forum and e-mail me to suggest a time suitable time.

[This post more properly belongs on your chess forum, but unfortunately it isn't open yet]

Jan-09-11  Yodaman: When looking at the position the first thing I noticed was the forcing line: 12 b4 Qxb5 14 Rfb1 Qa5 15 Rb5 ... and the queen escapes, but white has some attack.

I next looked for a new way to start the attack.

I found the same line <dzechiel> found. 12 e5 and then if black takes the pawn (12... dxe5) then 13 b4 Qxb4 14 Rfb1 Qa5 15 Rb5 Qd8 16 Bxc5 winning the knight.

Struggling to find something for white if black declined the pawn by moving his knight back (12...Nfe8 or 12...Nfd7), I soon gave up and decided to look at the solution. I knew that b4 was a key move, but I missed 13 a5 which was essential to trapping the queen.

Now that I'm looking at the solution, I think 13...e5 is a great move for black. I tried winning with the puzzle link that <David2009> provided, but I failed.

http://www.chessvideos.tv/endgame-t...

I'm very curious also to see a winning line for white. If somebody understands this puzzle completely and can beat Crafty at the puzzle link above, I would definitely love to see the winning line. Please post it here! Thanks.

Jan-09-11  doctorwho: <Stock> if 17... Nxe4?? then 18.Ncxe4 Qd5? 19.Nf6+!! and you resign..
Jan-09-11  doctorwho: sorry i meant <Stok>..
Jan-09-11  mahmoudkubba: It was better, whatever the real deep explanation(s) are for the game, to lose a horse and be minus one and/or minus two due to the winning of one pawn earlier than to lose the whole game when losing the queen. Anyhow no body knows why it was played like that. All of it started with the powerful move of the b pawn. Any idea abt the real explanation(s) and when this game was played ...etc ???
Jan-09-11  mahmoudkubba: Also from move 11 for b, b was able to figure out the danger on his q. especially after the 0-0 of the w's k far away from the b's q. U C the wings r sometimes so important to notice and also to notice the position(s) of ur pieces and where is really the opponent k is.
Jan-09-11  M.Hassan: "Insane" White to play 12.?
Forces are equal.
I went through two lines. One starting with Bishop move and the other with Knight move. The Bishop move starting with 12.Bxf6 and after 7 moves, both sides are equal so, to save time and effort, do not show it in here and just mention the one with Knight move.

12.Nd5 Qxd2
13.Nxe7+ Kh8
14.Nxd2 Re8
15.Nxc8 Raxc8
16.f3 Ne6
17.Bc3
White is up by a pawn. Time to check

Jan-09-11  Patriot: I considered 12.b4 Qxb4 but did not consider 13.a5 which is key in that line. I decided to just go for the simple 12.Nd5. On 12...Qd8 13.Nxf6+ exf6 looks slightly good for white. 13...Bxf6 looks dangerous because of 14.Qh6 and threatening 15.Ng5 but I think black can defend with 14...Ne6. If nothing else, white can just play 14.Bxf6 exf6 with a good game. I think 12...Qxd2 13.Nxe7+ Kh8 14.Nxd2 is inferior for black.
Jan-09-11  SpoiltVictorianChild: Saw that b4 drags the queen into the line of fire, but was unable to see how to take advantage of it. Still, I haven't had a bad week!

13 a5!! Stunningly simple and effective. A motif I hope I remember.

Jan-09-11
Premium Chessgames Member
  4tmac: mpl tries 18. ..Bxa1; Ghuzultyy tries 18. ..exd3; I tried 18. ..exf3; all with similar results: White has a winning advantage with ♕+initiative for material compensation for Black. All 3 lines are interesting games however.
Jan-09-11  muralman: I didn't get this Sunday puzzle. There were so many possible moves. The one I started with was played two moves later.
Jan-09-11  RandomVisitor: After 13...e5! 14.Rfb1 Nfxe4 complications allow black to resist


click for larger view

Rybka 4

<[+0.36] d=23 15.Bxe4> Nxe4 16.Qd3 Nc5 17.Qe2 Qxb1+ 18.Rxb1 exd4 19.Nb5 b6 20.axb6 Ba6 21.Qd1 axb6 22.Nfxd4 Ne4 23.f3 Ng3 24.Kf2 Bxb5 25.Kxg3 Bc4 26.Nc6 b5 27.Qxd6 Bc3 28.Qc5 Rfe8 29.Rd1 Bf6 30.Rd6

Jan-10-11  nariga: I think 13...e5 is incorrect for black. The following seems to be the right moves:

13. a5 Nfxe3

The idea is to push the white Q to the 1st row and block his f-rook. I dont see any good moves for white!

Jan-10-11  nariga: 13. a5 Nfxe4 (not e3)

oh well, he loses a knight for a pawn.
14. Nxe4 QxQ
15. Nxd2

Jan-10-11  RandomVisitor: After 11...Nc5:


click for larger view

Rybka 4

[+0.35] d=23 12.Nd5 Qd8 13.Rfe1 Nxd3 14.Nxf6+ Bxf6 15.Qxd3 e5 16.Be3 Qc7 17.b3 b6 18.a5 Bb7 19.Red1 Rfd8 20.c4 Bc6 21.a6 Bg7

[+0.34] d=22 12.Rfe1 Qb4 13.Qe3 Nxd3 14.cxd3 b6 15.Nb5 Bd7 16.Nc7 Rac8 17.Rec1 e5 18.Bc3 Qc5 19.Nb5 Bxb5 20.axb5 Nh5 21.Qxc5 Rxc5 22.Rxa7 Nf4 23.Rd1 Rxb5 24.g3 Ne2+

Jan-10-11  CHESSTTCAMPS: In this opening position, a Sicilian or Pirc, material is even. The development for both sides looks fairly typical, but it can be seen that the Nc5 has moved twice before completion of black's development in a mistaken effort to win the minor exchange. The position of Qa5 is particularly suspect in this setup. A typical tactic in similar positions is 12.Nd5 Qxd2? 13.Nxe7+ netting a pawn, but after 12... Qd8 13.Nxf6+ doesn't yield much advantage. White has a more serious attempt at refutation available:

13.b4! Qxb4

Black can't afford to go down a knight.

14.a5!

The BQ has no good escape and white threatens Rfb1 winning it. All defenses lose material:

A) 14... Nfxe4 15.Nxe4 Qxd2 16.Nexd2 wins a knight.

B) 14... e5 15.Rfb1 Qxb1+ 16.Rxb1 exd4 17.Nxd4 with R+B for Q and the bishop pair gives black fighting chances.

B.1) 15.Be3? allows Nxd3 16.cxd3 (or Qxd3) d5 and the Q escapes to d6.

There's a lot more analysis that could be done here, but these look like the most critical lines. Time to check the game and kibitzing.

Jan-10-11  CHESSTTCAMPS: As usual, Crafty EGT makes things difficult by getting 2Bs for the Q. Probably the the best course for white is to keep rooks and open the Kingside.
Jan-16-11
Premium Chessgames Member
  Phony Benoni: Five years ago, Korchnoi vs Balashov, 1971 was the Sunday puzzle for January 8, 2006. It contains a strikingly similar idea to this puzzle.
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