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Kevin Bonham
03-01-2004, 01:39 PM
Sorry, accidentally deleted this topic while moving it. Jeo has suggested we move topics consisting purely of game analysis to this section rather than Tournament News And Results. Luckily I still had a screen with the deleted material.

Jeo wrote:


Barry Cox wrote:
Rogers duely won against Yu. Here is the game...

GM Rogers,I - Yu,R
Lidums Adelaide University Australian Ch Adelaide University, 29.12.2003

1.e4 c6 2.Nf3 d5 3.Nc3 Bg4 4.h3 Bxf3 5.Qxf3 e6 6.g3 Nf6 7.Bg2 Nbd7 8.0-0 Ne5 9.Qd1 d4 10.Ne2 d3 11.Nf4 dxc2 12.Qxc2 g5 13.d4 Qxd4 14.Ne2 Qd3 15.Qxd3 Nxd3 16.Bxg5 Bg7 17.b3 Nc5 18.f3 e5 19.h4 Ne6 20.Bh3 Nxg5 21.hxg5 Nd7 22.Bxd7+ Kxd7 23.Rad1+ Kc7 24.f4 Rhf8 25.Kg2 exf4 26.gxf4 h6 27.gxh6 Bxh6 28.Kf3 Rfd8 29.e5 Bg7 30.Ng3 Re8 31.Rh1 Bxe5 32.fxe5 Rxe5 33.Rh7 Rf8 34.Kf4 Re7 35.Ne4 a5 36.Rd3 Rfe8 37.Ng5 Kb6 38.Nf3 Re4+ 39.Kf5 Re3 40.Rxe3 Rxe3 41.Ne5 Re2 42.a3 Kc5 43.Rxf7 b5 44.Ke6 Re3 45.Rf3 Rxf3 46.Nxf3 a4 47.b4+ Kc4 48.Kd6 c5 49.bxc5 b4 50.c6 bxa3 51.c7 a2 52.c8Q+ 1-0

I think the writing was on the wall around move 31 but Yu valiantly battled on. What do people think of 31...Bxe5? Deperate circumstances, desperate remedies? Or was something more circumspect called for?

Bill Gletsos wrote:


jase,
On the old board you asked about 43...RF2+ and I said that after 44.Ke4 Rxf7 45. Nxf7 white is simply winning.

I notice that Peter Parr in his Dec 29th SMH column he noted that the Rf2 line draws based on:
44.Ke4 Rxf7 45. Nxf7 a4! 46.Kd3!? (both bxa4 and b4+ look drawish) 46...axb3 47.Kc3 b5 48.Kxb3 Kb6 with c5 to follow and white can't make any progress.

However I believe that 46. b4+ is winning as follows:

43...Rf2+ 44.Ke4 Rxf7 45.Nxf7 a4 46.b4+ Kc4 47.Ne5+ Kb3 48.Kd3 Kxa3 49.Kc3 Ka2 50.Kc2 Ka3 51.Nd3 b6 52.Kc3 Ka2 53.Nb2 b5 54.Kc2 Ka3 55.Nd3 Ka2 56.Ne5 leads to mate in 17.

I wrote:


Yes, If there was a draw it was 38...a4 pointed out by Rogers. If anyone can find a way of keeping a White pawn on the board in the long term after 38...a4 they're doing better than me.

Bill wrote:


what about the line

38...a4 39.bxa4 Re4+ 40.Kf5 Rxa4 41.a3 Rea8 42.Ne5 R8a5 43.Rhh3

I wrote:


Holds it off for a while but I'm pretty sure Black still forces the last pawn off. I like 43...Ka7 when Black will try to push ...c5 then ...c4 followed by ...b5 when ...b4 can't be far away. Once the P gets to c4 then R can be swung to c5 blocking N checks and freeing the b-pawn, or in other lines ...f6 (possibly followed by ...Ra6+ depending on king position) can be used to dislodge the N which also frees the b-pawn for action. I can't prove Black gets the pawn off but I'm about 98% confident that he does, followed by an ending most likely of KRRN vs KRRP, which I would assume to be drawn with perfect play.

Sutek wrote:


Bill's analysis is spot on.
46.b4+ wins and is the only move that does!

Bill wrote:


My logic was that white seemed to have no hope if he was left with only the a pawn. Therefore b4+ was the only move that left him with the b pawn.

From that point on it was just a matter of analysis and then cross checking with the help of silicon.

Sutek wrote:



Bill here's another one for you to put through DF..


Canfell,G - Johansen,D [C03]
championship (3.5), 31.12.2003


1.e4 e6 2.d4 d5 3.Nd2 a6 4.Bd3 c5 5.exd5 exd5 6.Ngf3 c4 7.Be2 Nc6 8.0-0 Bd6 9.Re1 Nge7 10.b3 cxb3 11.axb3 0-0 12.Nf1 Bf5 13.Bd3 Rc8 14.Bxf5 Nxf5 15.Ng3 Nh4 16.c3 Nxf3+ 17.Qxf3 Ne7 18.Bg5 f6 19.Bd2 Qd7 20.Nh5 Rf7 21.Re2 Qf5 22.Bf4 Bxf4 23.Nxf4 Qd7 24.Rae1 a5 25.h3 Rb8 26.Qg4 Rd8 27.Re6 Rdf8 28.Nh5 Ng6 29.Rb6 Qc7 30.Qe6 Qxc3 31.Rxb7 Qxd4 32.Rc1 Qe5 33.Rxf7 Rxf7 34.Rc8+ Nf8 35.Qxe5 fxe5 36.Rc5 Rd7 37.Rxa5 Ne6 38.b4 Kf7 39.Kf1 Nd4 40.g4 g6 41.Ng3 Ne6 42.b5 Rb7 43.Ne2 Nc7 44.Nc3 Ke6 45.Ke2 h5 46.gxh5 gxh5 47.Kd3 d4 48.Ne2 Rxb5 49.Rxb5 Nxb5 50.f4 h4 51.fxe5 Kxe5 52.Ng1 Kf4 53.Ne2+ 1/2-1/2

Is this the right score?

Why didn't he take the queen?
33...Qxe6 34.Rxg7+ Kh8 35.Rcc7 Qe1+ 36.Kh2 Qe5+ 37.Ng3 f5 -+

Maybe time trouble?

sk

Bill wrote:


Yes, 33. ...Qxe6 seems to be clearly winning for Black.

As for why Black did not play this I have no idea. As you said maybe time trouble.

And I wrote:


My guess is he simply missed the full defence to 34.Rxg7+ which at first glance appears strong, but in fact loses after 34...Kh8 35.Rcc7 Qe1+ 36.Kh2 Qe5+ 37.Ng3 f5! and Black is safely Q for R+P up. That or the moves are wrong. I can't believe how many wins have been blown by the top players already in this tournament.

It is easy to be stunned by an apparently brilliant move and fail to analyse it objectively enough to realise it is rubbish.

Apologies for the mess-up, and those affected let me know if you want me to add them back on to your post counts. [/quote]

Bill Gletsos
03-01-2004, 04:43 PM
If they are producing bulletins it would be interesting to know if any of these questions are answered there.

In last years Aus Open the bulletins were published a PDF docs on the website.

Kevin Bonham
03-01-2004, 04:55 PM
That would be nice. Though the turnaround for bulletins is so tight there is rarely much room for more than superficial analysis in them.