Author: Kim Hvarre
Date: 13:02:30 08/06/98
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
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