Author: leonid
Date: 13:47:54 06/07/01
Go up one level in this thread
On June 07, 2001 at 13:51:05, John Merlino wrote: >On June 07, 2001 at 10:41:29, leonid wrote: > >>Hi! >> >>This position is not that difficult, not even deep. Only reason for saying that >>it is for "good program" is the few other positions, very close to this, were >>solved only by Heiner mate solver. >> >>[D]qQrq4/BPNB4/nqqQ4/kqbbNRRK/nqqQ4/PqPP4/qQrQ4/8 w - - >> >>Please indicate your result. >> >>Thanks, >>Leonid. > >Well, CM8000 announces Mate in 10 in just under 5 minutes on my PIII-600, but I >would be surprised if that was the optimal solution: Pretty good time! Ten moves, that Chess Master says, is actually optimal solution. I don't know if in 10 moves existe only one solution. My program solved this position, like Chess Master, by selective in 10 moves (28 sec.) and found for sure that mate not existe below ten. For this program looked 9 moves by brute force deep (1 hour 37 min 47 sec). Cheers, Leonid. > >Time Depth Score Positions Moves >0:03 1/3 1.54 155615 1. axb4+ Q5xb4 2. cxb4+ Qcxb4 3. > Q4xb4+ Q6xb4 4. Nxc6+ Bxc6 5. Qxb4+ > Nxb4 6. bxc8=Q Qxb8 7. Bxb8 >0:14 1/4 3.03 746627 1. axb4+ Qcxb4 2. Qxb4+ Q3xb4 3. > cxb4+ Bxb4 4. Nxc6+ Q6xc6 5. bxa8=Q > Qxb2 6. Qaxc6 Qxc6 7. Bxc6 Rxc6 >0:55 2/5 8.32 2961826 1. axb4+ Qcxb4 2. Bxb6+ Nxb6 3. > cxb4+ Ka4 4. bxc5+ Nc4 5. Nxc6 > Qh8+ 6. Qxh8 Rxh8+ 7. Q2xh8 Qaxb7 >4:51 2/6 Mate10 16644571 1. axb4+ Qcxb4 2. Qxb4+ Bxb4 3. > cxb4+ Q5xb4 4. Nxc6+ Qxc6 5. Q2xb4+ > Qxb4 6. Qbxb4+ Nxb4 7. Bb6+ Qxb6 > 8. bxa8=Q+ Na6 9. Qbxb6+ Nxb6 10. > Qxa6#
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