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Old June 14th 04, 04:41 PM
Chris Tilling
 
Posts: n/a
Default A double rook sac.

Hi All,

This blitz game played recently by yours-truly involves the sacrifice of
both my rooks. I'm white. I was really pleased with the game but I'm not
good enough to be able to say if my ideas were sound or not! The first sac
(on move 13) turned out OK, but is it sound? What do you think? Was black
already lost after 14...Qa5? Any comments are welcome as I don't have all
the answers myself. The position gets a bit too complicated for me to
accurately analyse to be honest. Perhaps you stronger players will see
through the variations and tell me what was really going on!

Thanks for any helpful comments

P.S. Please forgive my handling of the opening!



Chessnut Chris - Guest656544 [C11]

3m + 3s Main Playing Hall, 18.03.2004

C11: French: Classical System: 4 e5 and 4 Bg5 dxe4C11: French: Classical
System: 4 e5 and 4 Bg5 dxe4

1.Nc3 A bit of an odd-ball opening, but it soon transposes into relatively
more familiar territory. Although I must admit that I do not know the
subtleties of the French defence, so my opening play is mostly guesswork

1...d5 2.e4 e6 3.f4 Nf6 4.e5 Nfd7

[4...Ne4 5.Nf3 Nc6 6.Qe2 f5 7.exf6 Nxf6 8.d4]

5.d4 c5 6.Be3 Qb6 [6...Nc6]

7.Nf3N Qxb2? 8.Bd2?! [After the game I could see that better is 8.Nb5 Na6
9.a3+- With a big white advantage. Game continuation would be something like
.... 9...Nb6 10.dxc5 Bxc5 11.Bxc5 Nxc5 12.Rb1 Qa2 13.Nc7+ Ke7 14.Nxa8 Nxa8
15.Qc1]

8...Qb6 9.Rb1 Qc7 10.Be3 Looks a bit strange to keep moving this Bishop, but
I thought it was better placed on e3, and it would have to moved there
sooner or later anyway. 10...Be7 [10...a6 11.Ne2]

11.Bd3 [11.f5 0-0=]

11...Nc6 [11...c4 could be better (?) 12.Be2 a6 13.0-0 b5 14.f5 b4 15.fxe6
fxe6 16.Ng5 but this looks good for white]

12.0-0 Nb4?

[12...a6 Is the better choice. White perhaps needs to attend to the threats
to d4 and the queenside before he can start his f5 push.]

13.Rxb4!? The first rook sacrifice. Is it sound? Don't know! But it sure
felt good! The idea is to keep my precious bishops active, and to strike at
black with f5 before he can consolidate with his material advantage.

13...cxb4 14.Nb5 Qa5?! My fairly extensive analysis shows this is not the
best move. Although it is only my analysis - so, if I'm honest, I cannot be
to confident of my results, especially as it is complicated stuff. Here is a
sample of the analysis: [(a)14...Qc6 15.f5 exf5 (15...0-0 16.fxe6 (16.f6
gxf6 17.Qe1 f5 18.Bh6 Kh8) 16...fxe6 17.Bg5 Bxg5 18.Nxg5 g6 19.Nd6+-) 16.Bg5
f6 (16...a6 17.Bxe7 axb5 18.Bxb4 Nb8 19.Qe1 Qh6 20.e6 Bxe6 21.Nh4+-) 17.exf6
Nxf6 18.Qe2 Be6 19.Bxf6 Bxf6 20.Re1 (20.Bxf5 Kd8) 20...0-0 21.Qxe6+ Qxe6
22.Rxe6 f4 23.Nd6 Rab8 24.Ne5; (b)14...Qb6! Seems to be the best move. I'm
really not sure if this move refutes the whole idea of the rook sac. The
analysis I've done is a bit more than I can handle to be honest. Can white
play for a win, or at least a draw after this? A sample of my computer aided
analysis is below: 15.f5 exf5 16.c4 (16.Bg5 Bxg5 17.Nxg5 0-0 18.Rxf5 g6
19.Rxf7 Rxf7 20.Nxf7 Kxf7 21.Qf3+ Kg7 22.Qf4 Nf8 23.Nd6 Be6 24.Qf6+ Kg8;
16.Qe1 0-0 17.Bf4 Nb8 18.e6 Bxe6 19.Bc7 Qa6) 16...dxc4 17.Bxc4 0-0 18.Qc2
Kh8 19.Bd3 Rb8 20.Rc1 Rd8 (20...a6 21.Nc7) 21.Qf2 a6 22.d5 Qa5 23.d6 Bf8
24.Bxf5 (24.Ng5 Nxe5 25.Rxc8 b3 26.Rxb8 Rxb8) 24...axb5 25.Bxh7!! Bxd6
(25...Kxh7?? 26.Ng5+ Kg6 27.Qxf7+ Kh6 28.Qf5 Kh5 29.g4+ Kh4 30.Bf2#) 26.exd6
Nf6 27.Bb6 (27.Qh4 Nxh7 28.Rxc8 f6 29.Rxb8 Rxb8) 27...Qa3 28.Rd1 Re8 29.Bb1
Kg8 (29...b3 30.axb3 Qxb3 31.Bc2) 30.Bd4]

15.f5 a6 It seems reasonable to want to get rid of the knight. The other
options seem decidedly in whites favour [15...exf5?! 16.Bg5 a6 (16...h6?!
17.Bxe7 Kxe7 18.Qe1 g5 19.Nd6 f4 20.Nh4! (20.Nxf7?! Kxf7 21.e6+ Kg8 22.exd7
Bxd7) 20...Nb8 21.Nxf7 Kxf7 22.e6+ Bxe6 23.Bg6+ Ke7 24.Nf5+ Kd7 25.Qe5)
17.Bxe7 axb5 18.Bd6 Nb6 19.Ng5 g6 20.Qe1 Nc4 21.Qh4; 15...0-0?! 16.fxe6 fxe6
17.Bg5 Qd8 18.Bxe7 Qxe7 19.Nd6 a5 20.Qc1 h6 21.c3 bxc3 22.Qxc3 Nb6 23.Rb1
Qd8 24.Bc2 Nc4 25.Qd3 Rf5 26.g4+-] 16.Nd6+ [16.fxe6?! could be examined more
closely 16...axb5 17.Ng5 Nf8 18.Rxf7 (18.Nxf7 Rg8) 18...Nxe6 19.Qh5 but
after the calm Kd8, black is perhaps out of danger] 16...Bxd6 17.exd6
[17.fxe6 Be7 18.Ng5 Nf8 19.Rxf7 Nxe6 20.Qh5 Kd8-+]

17...Qxa2? Evidently black felt his position was safe enough to have time to
munch another pawn. But this looses quickly. Other options also fail to
help. It is already too late. This shows that the critical position was on
move 14 where black should have played 14...Qb6 [(a)17...exf5 18.Bg5 (18.Nh4
Nf6 19.Nxf5 Bxf5 20.Rxf5 0-0-0) 18...0-0 19.Be7 Re8 20.Ng5 Nf6 21.Bxf6 gxf6
22.Qh5!! fxg5 23.Qxg5+ Kf8 24.Qf6 Kg8 25.Rf3 Re4 26.Rg3+ Rg4 27.Rxg4+ fxg4
28.Qg5+ Kh8 29.Qh6 Bf5 30.Bxf5 Kg8 31.Qxh7+ Kf8 32.Qh8#; 17...exf5 is then
probably not the answer; neither is (b) 17...0-0 18.fxe6 fxe6 19.Ng5 Rxf1+
20.Qxf1 Nf6 21.Bxh7+ Nxh7 22.Qf7+ Kh8 23.Qe8+ Nf8 24.Qxf8#]

18.fxe6+- fxe6 black is totally lost [18...Nf6 19.exf7+ Kxf7 20.Ne5+ Ke6+-]

19.Ng5 Nf6 20.Rxf6!! The second rook sac! This time, the rook sac is clearly
the best move, with immediate tactical results. The queen invades blacks
position, aided by bishop and knight. this move sure felt good too!

20...gxf6 This leads to a forced mate but any other move looses lots of
material [20...Kd7 otherwise it's curtains at once 21.Rf7+ Kc6+-]

21.Qh5+ Kd7 [21...Kd8 doesn't improve blacks chances. Mate still follows
22.Qf7 Qb1+ (22...Bd7 23.Qxf6+ Kc8 24.Qxh8+ Be8 25.Qxe8#) 23.Kf2 Qg1+
24.Kxg1 Bd7 25.Qxf6+ Kc8 26.Qxh8+ Be8 27.Qxe8#]

22.Qf7+ Kxd6 23.Bf4+ Kc6 shortens the game by a few moves [23...e5 24.Qxf6+
Kd7 25.Qe6+ Kd8 26.Nf7+ Kc7 27.Qd6#]

24.Qc7# I like this final position. Black's rooks and Bishop are on their
starting positions, and all black's pieces are on the edge of the
board.(Lag: Av=0.37s, max=1.1s)

1-0




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  #2   Report Post  
Old June 18th 04, 06:43 PM
Chris Tilling
 
Posts: n/a
Default A double rook sac.

You can follow the game on the following webpage if its too difficult to
follow in your head:

http://www.christilling.de/Rook_sacs.htm


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  #3   Report Post  
Old June 20th 04, 12:34 AM
Ray Gordon
 
Posts: n/a
Default A double rook sac.

This blitz game played recently by yours-truly involves the sacrifice of
both my rooks. I'm white. I was really pleased with the game but I'm not
good enough to be able to say if my ideas were sound or not! The first sac
(on move 13) turned out OK, but is it sound? What do you think? Was black
already lost after 14...Qa5? Any comments are welcome as I don't have all
the answers myself. The position gets a bit too complicated for me to
accurately analyse to be honest. Perhaps you stronger players will see
through the variations and tell me what was really going on!

Thanks for any helpful comments

P.S. Please forgive my handling of the opening!



Chessnut Chris - Guest656544 [C11]

3m + 3s Main Playing Hall, 18.03.2004

C11: French: Classical System: 4 e5 and 4 Bg5 dxe4C11: French: Classical
System: 4 e5 and 4 Bg5 dxe4

1.Nc3 A bit of an odd-ball opening, but it soon transposes into relatively
more familiar territory. Although I must admit that I do not know the
subtleties of the French defence, so my opening play is mostly guesswork

1...d5 2.e4 e6 3.f4 Nf6 4.e5 Nfd7

[4...Ne4 5.Nf3 Nc6 6.Qe2 f5 7.exf6 Nxf6 8.d4]

5.d4 c5 6.Be3 Qb6 [6...Nc6]


6....cxd4 busts up your pawn center. Naka almost lost as White today by
making this mistake.


7.Nf3N Qxb2?


"He who takes the queen's knight pawn with the queen sleeps in the
treets." -- Russian proverb.

8.Bd2?! [After the game I could see that better is 8.Nb5 Na6
9.a3+- With a big white advantage. Game continuation would be something

like
... 9...Nb6 10.dxc5 Bxc5 11.Bxc5 Nxc5 12.Rb1 Qa2 13.Nc7+ Ke7 14.Nxa8 Nxa8
15.Qc1]


Computer says -1.18 for White.


8...Qb6 9.Rb1 Qc7 10.Be3 Looks a bit strange to keep moving this Bishop,

but
I thought it was better placed on e3, and it would have to moved there
sooner or later anyway. 10...Be7 [10...a6 11.Ne2]


10...cxd4 dooms White here.


11.Bd3 [11.f5 0-0=]

11...Nc6 [11...c4 could be better (?) 12.Be2 a6 13.0-0 b5 14.f5 b4 15.fxe6
fxe6 16.Ng5 but this looks good for white]

12.0-0 Nb4?

[12...a6 Is the better choice. White perhaps needs to attend to the

threats
to d4 and the queenside before he can start his f5 push.]


Computer says -0.63

I'll do the rest later.



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