Author: James Thompson
Date: 07:15:28 10/21/00
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You're right. I should have specified the mate was for white. Thanks for the clarification. James On October 21, 2000 at 03:07:41, James Robertson wrote: >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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