Author: Steven J. Brann
Date: 09:26:57 06/16/01
Go up one level in this thread
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
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