Author: Andrew Platt
Date: 16:16:15 09/08/04
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On September 08, 2004 at 17:17:38, Robert Hyatt wrote: >For example, the one-reply-to-check extension can be made to skip the first such >extension by just using 3/4 of a ply. Adding 3/4 of a ply doesn't extend, but >if you get another one-reply extension in the same path, now you have extended >1.5 plies which adds 1 ply of depth. Alternatively you can do as I do and start >every search at x.75 plies. IE my 5 ply search starts with a depth of 5.75 >plies, but that only searches to 5 plies normally. Any 3/4 ply extension will >take that to 6.5 which is the same as 6 plies. Another 3/4 ply extension will >take that to 7.25 which extends another real ply. Another 3.4 ply extension >takes us to 8, another real extension. But another only takes us to 8.75 which >doesn't change the depth. IE using 3/4 ply extensions means you are really >saying "extend 3 times and then skip one, which is one way of controlling tree >growth. > >Different extensions can interact using this approach, so that one says extend >for 3/4 plies, another says extend for 1/2 ply, the net result is a 1 ply >extension... Interestingly in a simple case of just check extensions this will have the opposite effect as Ed's - at least for the first few extensions - because he's dropping it at the beginning and then catching up later whereas you are dropping it later in the search. He estimates 10 ELO difference; do you believe that would be the case for Crafty? Andy.
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