Author: Heiner Marxen
Date: 11:07:17 06/17/01
Go up one level in this thread
On June 16, 2001 at 12:26:57, Steven J. Brann wrote: >On June 16, 2001 at 11:37:27, Uri Blass wrote: > >>On June 16, 2001 at 08:50:27, Steven J. Brann wrote: >> >>>On June 16, 2001 at 08:30:19, leonid wrote: >>> >>>>Hi! >>>> >>>>I am not sure how deep this position is but it look like that only strong >>>>program will find it easy. >>>> >>>>[D]3K4/1Q1Q1Q2/Q1R1R1Q1/2N1N3/Q1qBNqQ1/q1qBRq1q/brnq1nrb/3kq3 w - - >>>> >>>>Please indicate your result. >>>> >>>>Thanks, >>>>Leonid. >>> >>>Chessmaster 8000 finds the mate but it took longer than it usually does for your >>>positions, 4:50 on a PIII 933. >>> >>>Time Depth Score Positions Moves >>>0:00 1/3 19.45 52935 1. Nxc3+ Qcxc3 2. Rxe1+ Qxe1 3. >>> Bxc2+ Kc1 4. Bxc3 Rxg4 5. Bxb2+ >>> Qxb2 6. Nxf3 Qhxf3 >>>0:27 1/4 27.23 2248065 1. Nxc3+ Qaxc3 2. Rxe1+ Qxe1 3. >>> Bxc2+ Qxc2 4. Bxb2+ Nd3 5. Qdxd3+ >>> Qed2 6. Nxf3 Qcxd3+ 7. Qgxd3 >>>1:19 2/5 30.51 6857417 1. Nxc3+ Qaxc3 2. Rxe1+ Qxe1 3. >>> Bxc2+ Qxc2 4. Bxb2+ Nd3 5. Qgxd3+ >>> Rd2 6. Qdxf3+ Qhxf3 7. Qxf3+ Qee2 >>> 8. Nxc4 Qexf3 9. Qxc2+ Kxc2 10. >>> Qxa2 >>>4:50 2/6 Mate10 25540594 1. Nxc3+ Qaxc3 2. Rxe1+ Qxe1 3. >>> Bxc2+ Qxc2 4. Bxb2+ Nd3 5. Qgxd3+ >>> Rd2 6. Qaxc2+ Qxc2 7. Qgxf3+ Qfxf3 >>> 8. Qdxf3+ Qxf3 9. Qxf3+ Qe2 10. >>> Qfxe2# >>>8:43 3/7 Mate10 41570060 1. Nxc3+ Qaxc3 2. Rxe1+ Qxe1 3. >>> Bxc2+ Qxc2 4. Bxb2+ Nd3 5. Qgxd3+ >>> Rd2 6. Qaxc2+ Qxc2 7. Qgxf3+ Qfxf3 >>> 8. Qdxf3+ Qxf3 9. Qxf3+ Qe2 10. >>> Qfxe2# >>> >>>Steve >> >>I suspect that you should try to increase the value of the ss >>parameter(selective search). >> >>Using the default value is a mistake and I know that chessmaster6000 is usually >>faster with ss=10 so I believe that the same is truth for chessmaster8000. >> >>My experience tells me that with ss=10 I never see depthes like 2/5 or 3/7 but >>only 1/5 and usually also 1/7 so I guess that you used the default ss=6. >> >>Uri > >Yes, I usually use the default personality with 16MB hash to solve mate problems >like this. I have a personality I've been experimenting with, CM8999, which >uses SS=10 and 16MB hash. It solves the mate in 30 seconds less time: > >Time Depth Score Positions Moves >0:01 1/3 19.11 75985 1. Rxe1+ Qxe1 2. Nxc3+ Qcxc3 3. > Bxc2+ Kc1 4. Bxc3 Rxg4 5. Bxb2+ > Qxb2 6. Nxf3 Qhxf3 >0:12 1/4 22.32 1037835 1. Rxe1+ Qxe1 2. Nxc3+ Qexc3 3. > Bxc2+ Kc1 4. Qfxf4+ Bxf4 5. Bxc3 >0:19 1/4 26.54 1599743 1. Nxc3+ Qaxc3 2. Rxe1+ Qxe1 3. > Bxc2+ Qxc2 4. Bxb2+ Nd3 5. Qdxd3+ > Rd2 6. Qxc2+ Qxc2 7. Qxf3+ Qhxf3 > 8. Nxf3 Bxe6 9. Nxe6 >1:41 1/5 30.69 8989417 1. Nxc3+ Qaxc3 2. Rxe1+ Qxe1 3. > Bxc2+ Qxc2 4. Bxb2+ Nd3 5. Qgxd3+ > Rd2 6. Qgxf3+ Qhxf3 7. Qxf3+ Qee2 > 8. Nxc4 Qfxf3 9. Rxe2 Qxe2 >4:20 1/6 Mate10 25762076 1. Nxc3+ Qaxc3 2. Rxe1+ Qxe1 3. > Bxc2+ Qxc2 4. Bxb2+ Nd3 5. Qgxd3+ > Rd2 6. Qaxc2+ Qxc2 7. Qdxf3+ Qfxf3 > 8. Qgxf3+ Qxf3 9. Qxf3+ Qe2 10. > Qfxe2# >6:19 1/7 Mate10 37976728 1. Nxc3+ Qaxc3 2. Rxe1+ Qxe1 3. > Bxc2+ Qxc2 4. Bxb2+ Nd3 5. Qgxd3+ > Rd2 6. Qaxc2+ Qxc2 7. Qdxf3+ Qfxf3 > 8. Qgxf3+ Qxf3 9. Qxf3+ Qe2 10. > Qfxe2# > >Steve And since Chest found that "there is no mate in 9", we now also know, that the above mate is shortest possible. (On a K7/600 with 350 MB hash Chest used 10.5 hours for the above.) Cheers, Heiner
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