Author: Ed Schröder
Date: 20:35:18 08/03/98
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>Hi Ed, > >Interessting - thx! > >>From the 506 positions 349 of them are slower or faster than 10%. >> >>>>Total time Rebel9 : 02:04:57 >>>>Total time Rebel10 : 03:00:10 >>>>Total percent : -31% >> >>>Does this mean in this test set, at (presumably) a fixed depth setting, >>>R10+Anti-GM(Strong) was 31% slower than R9? (I know Strong Anti-GM >setting is >>>not as wise as SMART). >> >>Yes, fixed depth otherwise a comparison on time would make no sense. The >>test is done with anti-GM=OFF to make a good comparison with Rebel9. The >>-31% comes from the new search algorithm. >Indicating more knowledge or (just a slower algorithm:))? From my home page... - Improved search algorithm rewritten from scratch, better tactics. - Less selective than Rebel9, better results. I found the selective search in Rebel9 taking too much risk at certain points. Rebel10 is better in this respect. The negative result of such a wider search is of course that (speaking in terms of ply-depth) it takes a chess program more time to finish the ply (iteration). Here are (just) 3 examples of the so called "holes" (as chess programmers call it) in the selective search part of a chess program, in this case Rebel. 3rkb1r/p2nqppp/5n2/1B2p1B1/4P3/1Q6/PPP2PPP/2KR3R w kq - bm Rxd7 r1r2b2/pb4pk/1pB2p1p/3P1P2/8/PP2q1P1/2Q1P2P/RN2R2K b - - bm Rxc6 r2r2k1/Bpq2pbp/4p3/n3Pp2/5P1N/2P1Q3/P1P3PP/R4RK1 b - - bm Rxa7 If you test these positions with Rebel you will notice it takes Rebel a long time to solve these (simple) positions. This because of the too small (is risky) selective search. I even think (not tested) that Rebel Decade does a better job in these 3 particular positions :)) Fixed in Rebel10, it only takes a few seconds now. If this is worth the pretty huge investment of 30%, only time can tell but I think it does. - Ed - >snip again > >Regards, >kim
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