Moderators: hgm, Rebel, chrisw
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Depth Time
23 00:06
23 00:03
24 00:04
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I've stored that as a study from Johann (Janis) Behting (Carl's brother?), and I think Vincent Lejeune has or had it in one of his collections of test positions once, at least his name appears in my .pgn too, together with the one of Tim Foden, the chess programmer, without any knowledge of mine, why that neitherMartin Hertz wrote:[d]8/8/8/1B6/6p1/8/4KPpp/3N2kr w - - 0 1
Stockfish 8 struggles heavily with this zugzwang position.
2.7 didn't find it in about half an hour and depth 50 on a single thread, so I stopped.MikeB wrote:SF-McBrain 3.0 to be released tomorrow. With 18 threads, this could have been a lucky run.
Shredder 13 likewise reports an incorrect mate in 5.Martin Hertz wrote: Fritz 3 and Wchess cannot be tested, because they are buggy at this position, showing a wrong mate in 5.
(This is all I have seen of SugaR, well, Stockfish has bugs too)
Guess it's a combination of nullmove and LMRs mainly maybe, but "switching off nullmove" by UCI- option means very different things as you well know anyhow. At some branches it's mainly raising of verification only.Eelco de Groot wrote: Stockfish struggles a lot with it as well but if switching off nullmove does not work there may be some extra factor in search that is not helping, like LMP (Late Move Pruning). Somebody should tell Marco Z. that probably implementing this was maybe a little premature:
https://github.com/official-stockfish/S ... /pull/1183
He should have read other Marco's comments
I have no idea about the hash saving functions. At least it works with 2 Gigabyte if I understand you correctly?
I do think the OpenChess version with learning from Jeremy Bernstein, I hope I have that correct was very interesting. I saw Zerbinati working on an update, I got some GitHub notification of his branch, but that was a while ago, maybe gave up.
I don't know why Ancalagon can do this, really. Of course the ProbCut verification search", I just invent that name now, is the main thing but how exactly I don't really know. Also I have never measured how much Elo that costs, could be a lot.
Yes it seems Matefinder wins hands downs here!peter wrote:Guess it's a combination of nullmove and LMRs mainly maybe, but "switching off nullmove" by UCI- option means very different things as you well know anyhow. At some branches it's mainly raising of verification only.Eelco de Groot wrote: Stockfish struggles a lot with it as well but if switching off nullmove does not work there may be some extra factor in search that is not helping, like LMP (Late Move Pruning). Somebody should tell Marco Z. that probably implementing this was maybe a little premature:
https://github.com/official-stockfish/S ... /pull/1183
He should have read other Marco's comments
I have no idea about the hash saving functions. At least it works with 2 Gigabyte if I understand you correctly?
I do think the OpenChess version with learning from Jeremy Bernstein, I hope I have that correct was very interesting. I saw Zerbinati working on an update, I got some GitHub notification of his branch, but that was a while ago, maybe gave up.
I don't know why Ancalagon can do this, really. Of course the ProbCut verification search", I just invent that name now, is the main thing but how exactly I don't really know. Also I have never measured how much Elo that costs, could be a lot.
MateFinder 041017 needs 1 sec. for #11 by default (study mode not checked) single threaded.
Maybe Analysis Mode still has mate distance pruning? Removing that is really introducing inconsistencies.SugaR get's #11 almost at once with disabled nullmove and activated Corr.Chess Analysis Mode, latter one alone not helping up to depth 64 (2 minutes at 24 threads).
That would be great I think, if somebody could get it working again! I don't think I could do it.Jeremy Bernstein's SF PA_GTB was updated by Marco Zerbinat for some more version till now up to 1.0 Sf_PA_MZ at beginning of October