Author: Richard Pijl
Date: 02:26:21 12/06/05
Go up one level in this thread
On December 05, 2005 at 20:47:17, Joseph Tadeusz wrote: >On December 05, 2005 at 19:14:46, Martin Giepmans wrote: > >>[D] 8/3N4/8/8/1pp5/brpp4/qpprp3/1nkbK3 w - - 3 13 >> >>I guess many other engines will also not find it. Mine only finds it when I >>enable verification search (which is default off). >>It's a null move problem. >> >>Martin > >I think this position is perfect for double null move. > >The baron, which uses it, finds it instantly. Sorry, but in this case that has another reason, and also shows a requirement of doublenullmove in finding zugzwang situations. For zugzwang detection to work with double nullmove, all decision criterias for doing a nullmove or not should be symmetrical for side to move. Meaning that if you want to nullmove only when the side to move has at least a piece (which he can use to 'lose' a move), you also have to require that the opponent has at least a piece. I noticed that in knight endings there is often a zugzwang motive that is decisive in winning or drawing a game. So in the Baron a single knight is not considered sufficient material to allow nullmoves. In this position it means that nullmove is turned off completely. Richard.
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