Author: Uri Blass
Date: 03:49:56 03/21/03
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On March 21, 2003 at 05:21:18, Albert Bertilsson wrote: >>I agree that at the level of your program more than 50 plies are not needed but >>I am surprised that you get more than 50 plies with only check extension and bad >>move ordering. >> >>Maybe you should ask your program to print for you the line of 50 plies that it >>gets. >> >>If you search 50 plies than at depth 10 you should have 30 checks out of the >>first 40 moves even if you have 10 captures in the qsearch and it always almost >>does not happen because usually the opponent does not reply to check by a check >>and having 10 captures in the qsearch is also rare. >> >>Uri > >I've only noticed this happening very few times, actually without check >extensions, but the general situation when it happens: >Both sides have a piece that they need to protect or defend, if they don't the >loose almost immediatly. So the line is a series of moves from both sides trying >to vary their game to push the inevitable draw forward. When this happens in a >game some 20 very similar moves are played, that only very slightly avoids the >draw by repetiotion. Then the game usally ends by a draw, or that the pieces are >both captured, and then only two kings or something like it are left on the >board. The only situation when a side need to defend a piece is if the opponent threats that piece. I do not understand the logic of having threat extensions when you do not have even check extensions. Check is a private case of threat(threat on the king) and deciding to extend only threats against other pieces does not make sense. extending every threat by a full ply does not make sense and it may cause the tree to explode Uri
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