Author: James T. Walker
Date: 08:00:28 11/28/02
Go up one level in this thread
On November 28, 2002 at 03:32:44, Alastair Scott wrote: >On November 28, 2002 at 00:55:28, Uri Blass wrote: > >>On November 27, 2002 at 23:45:47, Robert Hyatt wrote: >> >>>On November 27, 2002 at 15:44:03, Alastair Scott wrote: >>> >>>>On November 27, 2002 at 10:44:12, Richard Pijl wrote: >>>> >>>>>I had special detection code for rambling rooks in the Baron, but removed that >>>>>in 0.99.3 as it fired wrongly in certain cases. This means that Baron 0.99.4 >>>>>beta 1 doesn't find the draw. >>>>> >>>>>Baron 0.36 (containing the rambling rook detection code) has no problem >>>>>detecting the draw, it spots it immediately, showing Kxe3 as the PV. When backup >>>>>up to the diagram position it doesn't show the draw anymore. The reason is that >>>>>Baron considers 60..gxh3 a mistake, enabling the draw. Instead, Baron 0.36 will >>>>>play 60..Rge2! >>>>> >>>>>I have been thinking a lot about a better way to detect perpetual check's but >>>>>haven't implemented anything yet. >>>> >>>>You're right - I saw Rge2 immediately after I played Rh3, but Ruffian never even >>>>considered it. >>>> >>>>But Crafty 19.1 comes up with a remarkable shot after 33 seconds (at 14 ply) - >>>>60..Rg1+. I doubt very much whether any human player would ever dream up _that_. >>>> >>>>Interestingly, the right move is played for the wrong reasons; Crafty, up until >>>>then, plays 60..gxh3 with a score of -6.5. It then moves to 60..Rg1+ with a >>>>score of -10 without ever realising that gxh3 should have a score of 0 ;) >>>> >>>>Alastair >>> >>> >>>I'm not understanding the crafty comment above. If Rg1 is -10, and gxh3 is -6, >>>I can see why it would prefer Rg1 over gxh3, so that white has g1 as a way out. >>>But why would it want to play a move that leads to a draw when it can get a -10, >>>which is good for black??? >> >>The comment is that crafty does not see the draw >>for gxh3 and prefers Rg1+ only because Rg1+ >>has a bigger advantage. >> >>This is what was considered as the wrong reason >>by the poster. > >Couldn't have put it better myself :) > >This is proving a tricky position. For example, SOS plays ..gxh3 and doesn't >seem to understand the position at all; it sees Rxe3+ but goes from 7 to 18 ply >thereafter with a score of -6.6 ... > >Alastair Isn't that natural since it will probably take 100 ply to see the draw? Jim
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