Author: Antonio Dieguez
Date: 20:52:48 01/09/00
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On January 08, 2000 at 15:39:05, Tom Kerrigan wrote: >On January 08, 2000 at 12:41:13, Antonio Dieguez wrote: > >>On January 08, 2000 at 11:56:25, Dan Andersson wrote: >> >>>>"Extensions" are usually used to keep a program from running out of search >>>>depth. My understanding was (probably very wrong) that extension are some kind >>>>of addition search done for few next plys deep. If this is really so, how can >>>>extension "keep program from running out of search depth"? >> >>that phrase traduced to spanish is not very clear I suppose you have the same >>little problem, may be keep program from running out means keep program running >>in ? >> >>>You said it yourself! By adding more depth. >>> >>>Regards DAn > >To jump the gun on Bruce a bit... If you are using some sort of recursive >alpha-beta function, one of the arguments to that function is "depth". If you >want to do a 10 ply search, you call the search function with depth = 10. For >each successive call to search, depth is tyically decreased by 1. When it >finally hits 0, it has "run out of search depth," so the quiescence search is >called. > >An extension will increase the depth at a particular node. Let's say depth = 5 >and you've reached a position where the side to move is in check. Typically, >depth is increased to 6, so the position is searched 1 ply more than it would >normally be. This is good because checks indicate that something is going on >tactically in the position and you want extra accuracy when evaluating it. > >-Tom very clear, thanks for your time and response Tom.I just ever called to te qsearch a extension too... but the language division is good. btw, suposing that if you do a nullmove and if you get mated you do a 1 ply of extension , have happened to you that sometimes a continuation never get finished? had happened to me various times especially if the mate is with a move catalogued as a losing capture... btw too, has been said that killer captures have not worked good, but losing captures that causes a cut off should be considered as a killer capture? doesnt look bad. -Antonio
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