Author: Alastair Scott
Date: 00:32:44 11/28/02
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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
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