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Subject: Re: fractional extensions

Author: William Bryant

Date: 15:26:19 06/23/99

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>IE the idea is that it takes two 3/4 ply extensions before you really extend
>anything.  And when you think of it, what this means is that the first 3/4
>ply extension is ineffective, but the next three of them extend the search
>by one ply.  Then the 5th does nothing, but the next three extend by one
>ply:
>
>1000  1075 [no change]  1150 [1 extra]  1225 [2 extra] 1300 [ 3 extra] 1375
>[no change again] and so forth...
>
>
>This isn't new at all...  We were doing this in the 1970's...

So, if you are in check at the same node that generates an additional 3/4 ply
extension, that node gets extended a full 2 plies -- or does the no more than
1 ply at a time rule always apply -- and the extras just roll over to the
next deeper node?

William
wbryant@ix.netcom.com




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