Syzygy question
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Syzygy question
I wonder how I can check that the syzygy dtz tablebases are working correctly, as it seems that an engine doesn't report them being used.
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- Posts: 6442
- Joined: Tue Jan 09, 2007 12:31 am
- Location: PA USA
- Full name: Louis Zulli
Re: Syzygy question
Here's something to try, inspired by a recent thread at the Rybka Forum.
I'm assuming you have 6-man syzygy tables?
With tablebases enabled, enter and search the following FENS:
8/8/8/6k1/3R2Pp/2b5/6K1/8 w - - 75 176
8/8/8/6k1/3R2Pp/2b5/6K1/8 w - - 1 176
The second search should show a win for White, but not the first.
Here's Stockfish from the command line:
I'm assuming you have 6-man syzygy tables?
With tablebases enabled, enter and search the following FENS:
8/8/8/6k1/3R2Pp/2b5/6K1/8 w - - 75 176
8/8/8/6k1/3R2Pp/2b5/6K1/8 w - - 1 176
The second search should show a win for White, but not the first.
Here's Stockfish from the command line:
Code: Select all
position fen 8/8/8/6k1/3R2Pp/2b5/6K1/8 w - - 75 176
go depth 5
info depth 1 seldepth 1 multipv 1 score cp 45 nodes 72 nps 36000 tbhits 1 time 2 pv d4e4
info depth 2 seldepth 2 multipv 1 score cp 45 nodes 85 nps 42500 tbhits 1 time 2 pv d4e4 c3a1
info depth 3 seldepth 3 multipv 1 score cp 45 nodes 118 nps 59000 tbhits 1 time 2 pv d4e4 c3b2 e4e2 g5g4 e2b2
info depth 4 seldepth 4 multipv 1 score cp 45 nodes 291 nps 145500 tbhits 1 time 2 pv d4e4 c3d2 e4c4 h4h3 g2h3
info depth 5 seldepth 5 multipv 1 score cp 45 nodes 482 nps 241000 tbhits 1 time 2 pv d4e4 c3d2 e4c4 d2e1 c4a4
bestmove d4e4 ponder c3d2
position fen 8/8/8/6k1/3R2Pp/2b5/6K1/8 w - - 1 176
go depth 5
info depth 1 seldepth 1 multipv 1 score cp 12353 nodes 73 nps 36500 tbhits 1 time 2 pv d4e4
info depth 2 seldepth 2 multipv 1 score cp 12353 nodes 81 nps 40500 tbhits 1 time 2 pv d4e4 c3d2
info depth 3 seldepth 3 multipv 1 score cp 12353 nodes 95 nps 47500 tbhits 1 time 2 pv d4e4 c3d2 e4e2
info depth 4 seldepth 4 multipv 1 score cp 12353 nodes 129 nps 64500 tbhits 1 time 2 pv d4e4 c3d2 e4a4 d2c1
info depth 5 seldepth 5 multipv 1 score cp 12353 nodes 265 nps 132500 tbhits 1 time 2 pv d4e4 c3d2 e4c4 d2e1 c4a4
bestmove d4e4 ponder c3d2
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- Posts: 352
- Joined: Thu Mar 09, 2006 6:00 pm
Re: Syzygy question
Thank you, that was most helpful.