Author: James Robertson
Date: 00:07:41 10/21/00
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On October 20, 2000 at 15:25:26, James Thompson wrote: >Regarding your solution, 1. Kg8 leads to mate in 10! Why not some other >variation like 1. Be4? > >James This position is mate for white. Insomniac gives Kg8 as the best reply, although still mated in 10. James > > >On October 19, 2000 at 22:07:42, Michael Neish wrote: > >> >>Hi, >> >>I wonder whether anyone might be able to explain why my program cannot see the >>solution to BT2630 #3 below >> >>[D]5r1k/p1q2pp1/1pb4p/n3R1NQ/7P/3B1P2/2P3P1/7K w - - >> >>The solution is 1. Re6, leading to the following tactics: >> >>1. Re6 Kg8 >>2. Rxh6 gxh6 >>3. Qxh6 f5 >>4. Qxf8+ Kxf8 >>5. Ne6+ forking King and Queen and gaining material. >> >>My program does not see this if it searches 8-ply deep, even though it is doing >>check extensions, and should therefore see it (I think) because there are two >>checks in the sequence. >> >>If I make it do a 9-ply search it does find the right move (but well over the >>time limit), and funnily enough, the PV that it gives (the correct one) extends >>to eleven ply (because of the two checks). >> >>So we're going from not seeing far enough at 8-ply, even though it should, to >>seeing further than you need to at 9-ply. >> >>The only strong program I have got, HIARCS 7.0, finds the move at 4-ply. Some >>heavy-duty extensions at work here I think ... >> >>Thanks for any feedback. >> >>Mike.
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