Author: Will Singleton
Date: 20:18:00 01/03/02
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On January 03, 2002 at 15:20:41, Peter Rosendahl wrote: >On January 03, 2002 at 14:45:20, Roy Eassa wrote: > >>On January 03, 2002 at 14:33:00, Peter Rosendahl wrote: >> >>>I have a question about this position: is it really clear that b4 >>>is the (only) best move? Motivated by my stupid engine, >>>which couldn't find b4 but stayed with Rg5, I tried first Rg5 and >>>after that b4 with Fritz 6 on the same position and got the >>>scores +4.00 / +4.09 after about 10 minutes (Athlon 900MHz). >> >> >>I think you're right, Rg5 is probably also a win. > >Thank you for the quick reply. After half an hour of analysis with Fritz 6 >the score for Rg4 drop a little to 3.59, but it seems both moves are wins. > >> >>I should have asked how long until a program selects b4 with a winning score, >>but I didn't want to give the first move away to anybody eyeballing the position >>(because b4 is such an odd-looking move and is very difficult for must humans to >>find). > >The position is very interesting to analyze (and my question wasn't meant as >a critique). Thanks for sharing! My program also sticks with Rg5. I'm running it on my laptop, so the depths aren't great, but I did your experiment (above), and found that the score after b4 was around -3.5, and after Rg5 was only around -1.5 (for 10-11 ply). Based on that, my prog should have selected b4. So, I think maybe we have a similar bug. I'll investigate hash, null-move, etc. Will
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