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problem with syzygy tablebases
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Youri Matiounine



Joined: 18 Oct 2013
Posts: 63
Location: New York

PostPost subject: problem with syzygy tablebases    Posted: Sat Feb 01, 2014 5:02 pm Reply to topic Reply with quote

I'm trying to implement syzygy tablebases in my program, and i came across one positions where syzygy tells me it is a loss, while it is really a win.

This is the FEN: 7R/8/3k3q/P7/8/3K4/8/8 w - - 0 0

White to move, so white rook takes black queen, and wins easily because white is now rook+pawn ahead.

When i call syzygy WDL function (probe_wdl_table), it returns -2, a loss.

Haw anybody seem this sort of problems? Perhaps somebody with functioning syzygy logic could check this position?

FYI, inside "probe_wdl_table" function i see material key of 0xf3d4f6f03036be3d, and i get idx=0x0000000003ceabed from the execution of "idx=encode_pawn(entry,entry->file[f].norm[bside],p,entry->file[f].factor[bside]);" line.

Thanks, Youri.
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Display posts from previous:   
Subject Author Date/Time
problem with syzygy tablebases Youri Matiounine Sat Feb 01, 2014 5:02 pm
      Re: problem with syzygy tablebases Ronald de Man Sat Feb 01, 2014 5:18 pm
            Re: problem with syzygy tablebases Youri Matiounine Sat Feb 01, 2014 5:45 pm
            Re: problem with syzygy tablebases Ronald de Man Sat Feb 01, 2014 6:12 pm
                  Re: problem with syzygy tablebases Youri Matiounine Sun Feb 02, 2014 3:52 am
                        Re: problem with syzygy tablebases Ronald de Man Sun Feb 02, 2014 12:17 pm
                              Re: problem with syzygy tablebases Youri Matiounine Tue Apr 08, 2014 2:21 am
                                    Re: problem with syzygy tablebases Ronald de Man Tue Apr 08, 2014 6:01 am
                                          Re: problem with syzygy tablebases Youri Matiounine Tue Apr 08, 2014 11:50 am
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