Author: margolies,marc
Date: 13:27:20 11/07/03
Go up one level in this thread
I am familiar with the text that you posted in the response. My reading of the text regards 5-pc sets. Also it considers design failures of engines which are not under consideration in this thread. Therefore I do not how to directly apply the text to our discussion because I cannot be sure what is still topical here, although I can draw some inferences that engine design is definitely an issue in the employment of large tablebases, that requiring a new unavailable base may not make the engine stupid. Is there more to say about it than this? On November 07, 2003 at 11:48:08, Javier Ros Padilla wrote: >On November 06, 2003 at 13:45:45, margolies,marc wrote: > >>wow, that's intersesting. I suppose that if there are exchanges before promotion >>it's ok. >>I am wondering if your outcome of success was predicated on the kind of position >>you examined or if the answer is universal. >> >> >>On November 06, 2003 at 04:12:29, Javier Ros Padilla wrote: >> >>>On November 05, 2003 at 19:22:33, margolies,marc wrote: >>> >>>>if you only plan to download 2 6pc-EGTBs, then avoid chosing a base with a P in >>>>the name-- because it refers to other bases after pawn promotion thus making it >>>>unusable without subtables. >>> >>>I think you can use them without subtables, after promotion the engine and the >>>available tablebases must help in normal play. >>> >>>For example with the KRPP-KR tablebase 4.7 Gb you can analyze a single position >>>without consulting the subtables. >>> >>>Javier Ros >>> >>> >>>> >>>> >>>>On November 05, 2003 at 18:11:52, Torstein Hall wrote: >>>> >>>>>I planned to download one or two 6 man tabelbases if I can find any. Is there >>>>>one or two I should prefer? >>>>> >>>>>Torstein > >see this text extracted from > >http://www.aarontay.per.sg/Winboard/Winboard3.html > >author Aaron Tay > >[C.7] How many tablebases do I need? Can I download only some of them? > >The more tablebase files you install, the stronger the program will be. However, >a full set of 3,4 and 5 Tablebase files takes about 8 GB of Hard disk space! >Most people download a full set of 4 Piece databases and select only a few of >the 5 pieces. > >Generally the 5 piece endgames with rooks are reached most frequently and should >be downloaded . However, there are some pitfalls that you should be aware of. > >If you want to use the KRPKR tablebase [and assuming you have all the 3 and 4 >tablebases], make sure that you have the following endgame tablebases as well, >KQRKR, KRBKR, KRRKR, KRNKR, . This is to ensure that the promotion cases are >included. > >If you lack say the KQRKR tablebase, some programs refuse to queen the pawn in >the KRPKR even if that would lead to a win, because such a move, would cause the >program to drop from a position flagged as "win", to a position that is >uncertain since they lack the relevant endgame table. > >A similar problem can result if you download only the KQPKQ tablebase without >KQQKQ , KQRKQ etc.. > >Some programs like Crafty and Yace are "smart" enough to avoid this problem, but >most like Amy , or The Crazy Bishop cannot handle this. > >Also take note that not all programs support all the Tablebases. Yace for >example, currently does not use the 4+1 tablebases [ King and 3 pieces/pawns on >a side versus a alone King] , because such positions are easily won most of the >time barring rare cases [Like double rook pawns, wrong coloured bishop and King >vers King]. Also I think only Crafty currently, supports 6 piece tablebases. >Szots Gabor also reports that Wildcat , Capture and perhaps Inimichess cannot >handle incomplete 5 men tablebase > > > Javier Ros
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