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Less null move pruning by trans map
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Onno Garms



Joined: 12 Mar 2007
Posts: 224
Location: Bonn, Germany

PostPost subject: Less null move pruning by trans map    Posted: Sun Mar 13, 2011 7:38 pm Reply to topic Reply with quote

There seems to have been some improvement of Onno by using the trans
map to skip null move pruning on certain moves.

After I made a move, I check the trans map before doing null move
pruning. There might be no trans cutoff because the depth found in the
trans map is smaller that current search depth (trans.max_depth <
p_depth). However it is still possible that trans_max_depth >= p_depth
- SearchInnerRc::null_reduction.

So I do the following:

Code:

    // Even with a move opponent is not so well off.
    // So null move pruning is unlikely to be successful.
    if (SearchInnerRc::null_skip_by_trans && trans.max_value <= p_alpha && trans.max_depth >= p_depth - SearchInnerRc::null_reduction)
      *v_no_nmp = true;
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Subject Author Date/Time
Less null move pruning by trans map Onno Garms Sun Mar 13, 2011 7:38 pm
      Re: Less null move pruning by trans map Robert Hyatt Fri Mar 18, 2011 2:29 pm
            Re: Less null move pruning by trans map Mincho Georgiev Sat Mar 19, 2011 9:58 am
                  Re: Less null move pruning by trans map Mincho Georgiev Sat Mar 19, 2011 12:35 pm
                        Re: Less null move pruning by trans map Mark Lefler Mon Mar 21, 2011 12:01 am
                              Re: Less null move pruning by trans map Robert Hyatt Wed Dec 11, 2013 2:50 pm
                                    Re: Less null move pruning by trans map H.G.Muller Wed Dec 11, 2013 3:37 pm
            Re: Less null move pruning by trans map Onno Garms Sat Mar 19, 2011 2:17 pm
                  Re: Less null move pruning by trans map Rein Halbersma Tue Dec 10, 2013 9:28 am
                        Re: Less null move pruning by trans map Robert Hyatt Tue Dec 10, 2013 8:46 pm
                              Re: Less null move pruning by trans map Rein Halbersma Tue Dec 10, 2013 9:48 pm
                  Re: Less null move pruning by trans map Ralph Stoesser Tue Dec 10, 2013 8:20 pm
                        Re: Less null move pruning by trans map Robert Hyatt Tue Dec 10, 2013 8:48 pm
                              Re: Less null move pruning by trans map Ralph Stoesser Tue Dec 10, 2013 9:00 pm
                                    Re: Less null move pruning by trans map Robert Hyatt Tue Dec 10, 2013 9:07 pm
                                          Re: Less null move pruning by trans map Ralph Stoesser Tue Dec 10, 2013 9:37 pm
                                                Re: Less null move pruning by trans map Robert Hyatt Tue Dec 10, 2013 10:11 pm
                        Re: Less null move pruning by trans map Mark Lefler Tue Dec 10, 2013 9:39 pm
      Re: Less null move pruning by trans map Sergei S. Markoff Tue Dec 10, 2013 9:13 am
            Re: Less null move pruning by trans map Daniel Shawul Tue Dec 10, 2013 3:56 pm
                  Re: Less null move pruning by trans map Sergei S. Markoff Tue Dec 10, 2013 8:21 pm
                        Re: Less null move pruning by trans map Daniel Shawul Tue Dec 10, 2013 10:41 pm
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