Author: Alastair Scott
Date: 12:44:03 11/27/02
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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
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