Author: Peter McKenzie
Date: 02:02:43 01/11/00
Go up one level in this thread
On January 11, 2000 at 03:45:04, Ed Schröder wrote:
<snip>
>[d]r4rk1/p1q2ppp/1pn2n2/2p1p3/3PP1b1/P1P2N2/B4PPP/R1BQR1K1 w - - 0 14
>
>[White "Kasparov, Gary"]
>[Black "Kramnik, Vladimir"]
>
>14. dxc5! { Natural 14.d5 will be serious positional mistake- bishop on a2
>could be closed for a long time.}
>
>I bet most programs (Rebel included play 14.d5). 14.d5 looks okay and for
>many good reasons still it's called a serious positional mistake. That hurts!
Thanks for posting a couple of interesting positions Ed. This new diagram
feature is great isn't it!
A 5min search on my P133:
1. d5
Found in: 0sec, 0.5ply Completed: 9.17ply
Used: 300sec, Total Nodes: 2633730, NPS: 8779
PV: d5 Rad8 h3 Bxf3 Qxf3 Ne7 Bc4 Rd6 Be3 Rfd8 Rad1
White by 0.6
So LambChop doesn't understand this position, no great surprise to me. However
I don't think this position is anything too exceptional, I think it obeys the
classical chess theory in particular the Nimzowitch blockade idea. All that is
required is to understand that the black knights become strong in this closed
middlegame, and that the protected passed pawn isn't too dangerous. A good
bonus for a knight blockading a passed pawn (I assume a black knight should go
to d6) would help - I don't have such a bonus (yet :-). Does Rebel have such a
bonus?
>
>
>Case 2:
>
>[d]2rq2k1/4bppp/p1rp4/1p1NpP2/4P3/2PQ4/PP4PP/3R1R1K w - -
>
>Robert Fischer's famous: Ra1!!
>
>I assume almost every program will play f6? here leaving white with
>nothing. I wonder if any program will find this fine positional move.
I'm not so sure f6 is bad. I seem to remember GM Stean analysing it in his
excellent book 'Simple Chess' where he concluded it too was quite good for
white. But my memory isn't clear, and my copy of that book is in another city.
In any case, it is typical of Fischer to prefer strategic clarity over messy
complications.
Strange, but LambChop finds this Ra1 move:
1. Ra1
Found in: 56sec, 7.2ply Completed: 9.0ply
Used: 300sec, Total Nodes: 3084289, NPS: 10280
PV: Ra1 Rc4 b3 R4c5 a4 Bg5 axb5 Rxb5 b4
White by 0.5
I'm not even sure why chop finds Ra1 - a pleasant and amusing surprise that
makes all those countless hundreds of hours programming and testing seem
worthwhile. I'm guessing it has something to do with mobility.
>
>Ed
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