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Neat site I came across for egtb.

Posted: Fri Apr 07, 2006 3:52 am
by jshriver

BDDs and Compression Results

Posted: Sat Apr 08, 2006 9:39 am
by guyhaw
This thesis investigates the use of Binary Decision Diagrams (BDDs) to see if they are a more compact and more efficiently-accessed way of storing chess endgame tables (EGTs).

The compression results seem, on aggregate, to be no better than achieved already with Nalimov EGTs.

The access-times do not really compare 'like with like' as the BDD access-times require the BDD to be (unscalably) in RAM, which a Nalimov EGT would not be.

BDDs are also at the centre of Joe Hurd's paper, producing the EGT results by theorem-proving techniques using HOL, q.v.
http://www.cl.cam.ac.uk/~jeh1004/resear ... /chess.pdf

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Posted: Sat Apr 08, 2006 10:07 am
by gambit3
thanks guy, i hadn't gone through this one yet...