Author: Peter McKenzie
Date: 15:04:17 09/07/01
Go up one level in this thread
On September 07, 2001 at 15:51:29, Bruce Moreland wrote: >On September 07, 2001 at 03:50:03, Uri Blass wrote: > >>On September 07, 2001 at 02:14:17, Bruce Moreland wrote: >> >>>On September 06, 2001 at 13:58:00, Uri Blass wrote: >>> >>>>Do you assume that all programs use the same extensions? >>>> >>>>I can imagine that programs with more extensions can see it in less plies even >>>>with perfect move ordering. >>> >>>If you write a program that has a functional hash table, no null-move pruning, a >>>sensible eval, and so on, it will solve this problem in no time at between 18 >>>and 26 plies, which is approximately what Bob said. >>> >>>What is happening here is that Tiger is doing very badly. I am pretty good at >>>screwing up Fine 70. Assuming that Tiger's hashing system is not simply broken, >>>my bet is that he's doing null-move in some tricky way in the king + pawn ending >>>and/or he's doing some sort of reduced depth search that's eating his hash >>>table. >>> >>>It's hard to know what anyone would extend here. >> >>I can think of getting closer to the pawns with the king >>as something that encourage extensions in pawn endgames. >> >>I do not say to extend every move when the king gets closer to the pawns because >>it is too much but >>it is possible to think about extending 1/4 ply for every move that gets closer >>to the pawns so after 4 moves that reduce the distance to the pawns you extend 1 >>ply. > >It would be hard to figure out how to do that efficiently here, in any sense >that has any meaning here or elsewhere. It's a great problem, but it's also >just one big trick. I would venture that *nobody* is solving this faster with >extensions, and anyone who is solving it slower is either broken or trying to do >something tricky in the general endgame case, but which doesn't work here in a >position like this. > >This position is a classic "no tricks" position. There is another one like >this, too, where the key is Kh8, and you can find a fifty-move draw from the >root (100+ plies of search). I want that position, do you have it handy? > >bruce > >> >>Uri
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