Author: Christophe Theron
Date: 14:17:21 08/06/98
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On August 06, 1998 at 16:02:30, Kim Hvarre wrote:
>As You mentioned Rebel9 in normal setup will have a hard time finding these
>(quote):
>
>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 -
>
>But - as You know, too - Rebel9 with sel=3 does a lot better job, e.g.:
>
>3rkb1r/p2nqppp/5n2/1B2p1B1/4P3/1Q6/PPP2PPP/2KR3R w kq - bm Rxd7 ce 418; pv 00:25
> 8.00 4.18 Rd1xd7 Nf6xd7 Bg5xe7 Bf8xe7 Rh1-d1 a7-a6 Bb5xd7+ ; c0 Analysis by
>Rebel 9.0; c1 30 seconds per move; c2 Pentium at 460 Mhz;
>r1r2b2/pb4pk/1pB2p1p/3P1P2/8/PP2q1P1/2Q1P2P/RN2R2K b - - bm Rxc6 ce 396; pv
>00:27 10.00 3.96 Rc8xc6 d5xc6 Ra8-c8 Nb1-d2 Rc8xc6 Qc2-e4 Rc6-c7 ; c0 Analysis
>by Rebel 9.0; c1 30 seconds per move; c2 Pentium at 460 Mhz;
>r2r2k1/Bpq2pbp/4p3/n3Pp2/5P1N/2P1Q3/P1P3PP/R4RK1 b - - bm Rxa ce 240; pv 00:49
>9.00 2.41 Ra8xa7 Rf1-b1 Ra7-a8 Nh4-f3 Na5-c4 Qe3-f2 f7-f6 ; c0 Analysis by
>Rebel 9.0; c1 30 seconds per move; c2 Pentium at 460 Mhz;
>
>(could have done even better in pure DOS, but...)
>
>Then it could be interessting to see the equivalent figures for the comming
>Rebel10, if You got the time. And further - would You recommend (in general) the
>sel=3 for Rebel9 on a fast machine?
>
>Regards,
>kim
Just for your information, I give the solution time for Chess Tiger 11.5 (16Mb
hash, K5-100MHz=P200). My intention is not to say that CT11.5 is so great. I am
sure many other programs find the solution even quicker. Other results are
welcome.
3rkb1r/p2nqppp/5n2/1B2p1B1/4P3/1Q6/PPP2PPP/2KR3R w kq - bm Rxd7
found in 0.32s.
r1r2b2/pb4pk/1pB2p1p/3P1P2/8/PP2q1P1/2Q1P2P/RN2R2K b - - bm Rxc6
found in 0.66s.
r2r2k1/Bpq2pbp/4p3/n3Pp2/5P1N/2P1Q3/P1P3PP/R4RK1 b - - bm Rxa
found in 0.33s.
Just to say I was very surprised to see that R9 had such "holes", and that your
sel=3 doesn't come even close to solving them. Fritz, Nimzo, Junior, Genius and
others should solve these position even quicker I think.
Christophe
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