What does it mean when seldepth < depth? #4360
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RogerThiede
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It means at a certain depth it is not able to find a continuation that stays within the alpha-beta bounds, i.e. fails high or low, and as such is not on the PV. |
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Selective Depth, also known as
seldepth, is the depth of the deepest principal variation line in the search. Normally, depth and seldepth are either the same or seldepth > depth. I've been encountering some deep analysis where depth keeps increasing while seldepth actually decreases.I first was only seeing it when cp = 0, but now I've been seeing it when cp != 0 as shown in multipv 5.
What are the conditions in which the algorithm would cause a decrease of seldepth?
info depth 74 seldepth 7 multipv 1 score cp 0 wdl 7 986 7 nodes 1089469343535 nps 58897270 hashfull 647 tbhits 2397488 time 18497790 pv ...info depth 74 seldepth 44 multipv 2 score cp 0 wdl 7 986 7 nodes 1089469343535 nps 58897270 hashfull 647 tbhits 2397488 time 18497790 pv ...info depth 74 seldepth 82 multipv 3 score cp 0 wdl 7 986 7 nodes 1089469343535 nps 58897270 hashfull 647 tbhits 2397488 time 18497790 pv ...info depth 74 seldepth 91 multipv 4 score cp -3 wdl 6 986 8 nodes 1089469343535 nps 58897270 hashfull 647 tbhits 2397488 time 18497790 pv ...info depth 74 seldepth 72 multipv 5 score cp -8 wdl 5 985 10 nodes 1089469343535 nps 58897270 hashfull 647 tbhits 2397488 time 18497790 pv ...info depth 74 seldepth 79 multipv 6 score cp -13 wdl 3 983 14 nodes 1089469343535 nps 58897270 hashfull 647 tbhits 2397488 time 18497790 pv ...Beta Was this translation helpful? Give feedback.
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