Author: Robert Hyatt
Date: 15:29:00 02/19/01
Go up one level in this thread
On February 19, 2001 at 13:21:18, Joseph Merolle wrote: >On February 19, 2001 at 12:49:16, Robert Hyatt wrote: > >>On February 19, 2001 at 12:35:20, Joseph Merolle wrote: >> >>>On February 19, 2001 at 12:28:57, Mike S. wrote: >>> >>>>On February 19, 2001 at 12:24:25, Joseph Merolle wrote: >>>> >>>>>(...) what does the no. after the = sign represent. >>>> >>>>AFAIK this is the number of tablebase positions which occur during the search. >>>> >>>>Regards, >>>>M.Scheidl >>> >>> >>>What does tablebase positions mean. >> >>positions where a capture took the total number of pieces to 5 or >>less and the resulting tablebase file was present. IE it is a "hit" >>counter. > > >I dont understand , why does the no. increase as the plys get deaper. Know one >has told me what the no. represents. Does it mean that there are 233 positions >that a capture can lead to. In other words if it says tb=60 does that mean that >from this position it could end up in one of the 60 positons in the tb. and if >this is true how come the engine does not kick off and get the eval from the tb >instead of the engine calulations? Thanks for the help Think about this: If you have 8 pieces on the board, after 1 ply you can have _zero_ tablebase hits because at most you can reduce the total pieces to 7. If you do 3 plies, there will be _some_ 5 piece positions you reach if all three plies are captures. That results in a hit for each case. But there are also moves and choices where zero one or two captures are made in the first three plies. If you go four plies deep, you have more ways to reach 5 pieces left. The deeper you go, the more ways you find to reduce total material to 5 pieces and hit the tables...
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