Author: Peter McKenzie
Date: 19:09:17 03/17/00
Go up one level in this thread
On March 17, 2000 at 21:43:22, Dann Corbit wrote: >On March 17, 2000 at 21:31:38, Dave Gomboc wrote: >>On March 17, 2000 at 21:03:40, Ernst A. Heinz wrote: >>>Hi Dann, >>> >>>>In order to create an accurate tactical suite, I would like to have these rows >>>>crunched by alternative software tools. The current analysis does not get "the >>>>right answer" so the question is, will other programs see it? >>> >>>Most of the positions you posted do *not* seem to be tactical but >>>rather positional in nature (e.g. "Soszynski 80 #13" is actually >>>from the positional subset of LCT-II). >>> >>>>[D]r1r3k1/5p2/p3p1p1/b6p/Pp2N3/1P2P3/5PPP/2R1K2R w K - acd 18; acn 1259897193; >>>>ce -32; pv O-O Bd8 Rfd1 Be7 Kf1 Kf8 Ke1 f5 Ng3 Rc3 Rb1 Kf7 Ne2 Rc5 Rbc1 Rac8 >>>>Rxc5 Bxc5 Nd4; pm O-O; bm Ke2; id "Soszynski 80 #8"; >>> >>>Positional -- "DarkThought WCCC'99" never chooses 0-0 as best. It likes >>>Ke2 from the beginning and even switches to Kd2 in iteration #15. >> >>Which brings the question to mind: why would anyone want their king on g1 >>instead of d2 or e2 here? Playing O-O looks like a serious mistake to me. > >I'll bet it's a somewhat misapplied king safety calculation. Still three loose >pieces on the board and castling looks sensible if you can't see the board (I >know that sounds silly, but I bet most king safety calculations just look at >game phase). In any case, it's not a big loss, because you can always pop the >king whenever you like by opening the can with g3. > >I think e2 is better, but it's very marginally better. You have to do something >to protect the rook, and it's about time to bring the king into the fray. But I >remain unconvinced that one move is vastly superior to the other. Of course, I think white has much better winning chances after Ke2, I wouldn't be surprised if O-O throws away a half point with best play. I think whites plan is to centralise both rooks and infiltrate on the queen side. This may involve regrouping the knight (possibly to c4 which would be a nice outpost), and maybe swapping one or both pairs of rooks. The king on e2 has the following advantages: - later it may run to the queenside and gobble black pawns - it helps keep black rooks out of d2 - it can help white oppose a black rook on the d-file if a pair of rooks is swapped off. I did a quick check with LambChop, it chooses Ke2 from ply 1 through ply 9 (didn't complete ply 10) with a score of around +0.4. cheers, Peter
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