Author: Robert Hyatt
Date: 07:26:21 09/11/01
Go up one level in this thread
On September 11, 2001 at 02:17:09, Uri Blass wrote: >On September 10, 2001 at 21:27:02, Dave Gomboc wrote: > >>On September 10, 2001 at 05:56:21, Uri Blass wrote: >> >>>On September 10, 2001 at 05:02:43, Gian-Carlo Pascutto wrote: >>> >>>>On September 10, 2001 at 00:48:34, Dave Gomboc wrote: >>>> >>>>>>>>>>>32.Bg5 Bg7 33.Bf4 c4 34.Re2 Bd7 35.Rd1 Bb5 36.Ree1 Bxa4 37.bxa4 Rb2 >>>>>>>>>>>38.Rd2 Rxa2 39.Bxf5 >>>> >>>>>>>Black has better earlier on: >>>>>>> >>>>>>>Instead of 36. .. Bxa4 first 36. .. Nd3! >>>>> >>>>>It looks like White also has better earlier on: >>>>> >>>>>36.Bxe5! Nxe5 >>>> >>>>Bxe5 captures the knight, so Nxe5 is obviously impossible. I think >>>>you are looking at the wrong line... >>>> >>>>36.Bxe5 Bxe5 is a straight win for black >>> >>>Dave meant 36.Bxe5 Bxe5 and it is not clear >>> >>>Here is again the relevant analysis(I added * to singular moves of black that is >>>before move 39 and I am going to look at this position more today because I have >>>other things to do) >>> >>>Thanks to dave Gomboc for doing the job. >>>I did not look at most of the analysis for 37...Bxh2+ >>> >>>36.Bxe5! Bxe5* 37.Nc5! Bxh2+ 38.Kxh2 dxc5* 39.a4 Bc6* 40.Rd6 cxb3 41.Bd3 b2 >>>42.Re1 b1Q 43.Rxb1 Rxb1 44.Bxb1 is unclear, while after 40.Re6 Kf7 41.Rde1 cxb3 >>>42.Bd3 Bb5 43.axb5 Rxe6 44.Bc4 Rbb6 45.Bxb3 White should be able to hold the >>>rook ending. Meanwhile, 40.Re6 Kf7 41.Rde1 Rxd7 42.b4 cxb4 43.cxb4 Rb7 44.Bd1 >>>Rxb4 45.Bf3 Bxf3 46.Rxa6 Rb2 is wild!, I'll let someone with a faster machine >>>handle that variation (there may be good deviations for either side along the >>>way too). If something refutes this line, it's probably this. >>> >>>This leaves 36.Bxe5! Bxe5* 37.Nc5! dxc5 38.Rxe5 Rxa2* 39.bxc4 Bxc4 40.Rxc5 which >>>looks like White should be able to grovel a draw here too. >>> >>>39...Bc6 40.Rxc5 Bxg2 may be an improvement for black and I did not check this >>>line >>> >>>Uri >> >>I think more of the moves are singular than you are giving credit for. For >>instance, 38.Kxh2 is an obvious case (though perhaps you were counting that as a >>normal recapture-extension). > >I count only black moves and I did not count moves after move 39. > >Uri If we are talking about SE, then both sides can be extended. You have to take their output, ie 11(6) and use that "11 plies" as a starting point. Each singular move adds 1 ply to that. Note that a move can be both singular and out of check, and it gets extended by 2 plies. Their only extension constraint was that two consecutive plies could not extend more than 2 plies total. IE if you extend twice at ply N, then you could not extend by 1 on both the previous and next moves (before and after that 2-ply extension ply). That kind of search can probe _very_ deeply in the right lines since SE was not their _only_ extension. It was generally "in addition to" everything else we all normally do.
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