Author: Heiner Marxen
Date: 17:23:02 11/15/01
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On November 15, 2001 at 12:05:46, Paul wrote: >On November 15, 2001 at 11:45:39, leonid wrote: > >>On November 15, 2001 at 09:44:55, Paul wrote: >> >>>On November 15, 2001 at 09:09:08, leonid wrote: >>> >>>>[D]2nkN3/2nqN3/2rrbb2/RBqQQqQQ/RBqNPqPQ/2qpqp2/3B4/3K4 w - - >>>> >>>>Please indicate your result. >>>> >>>>Thanks, >>>>Leonid. >>> >>>Hi Leonid, >> >>Hi! >> >>>Haha! .. that was a surprise when I saw what Pretz came up with: >>> >>>1. Nexc6+ Qcxc6 2. Qgxf6+ Qxf6 3. Qexf6+ Qxf6 4. Qxf6+ Qe7 5. Qxe7+ Nxe7 6. >>>Nxe6+ Nxe6 7. Ra8+ Nc8 8. Rxc8+ Kxc8 9. Nxd6+ Kd8 10. Ra8+ Qxa8 11. Qxa8+ Qc8 >>>12. Qe8+ Kc7 13. Qexc8+ Kb6 14. Qa5# >>> >>>So a mate in 14! I think I must have a bug ... >> >>I don't think so. It is mate in 13. Verified it 12 moves deep by brute force to >>be sure. Easy branching factor. Found mate in 13 by selective. Your, probably, >>went just one move deper to find its mate. Good result. > >Just after I posted my message mine also found a mate in 13 ... I was just too >quick, but I had to laugh out loud because I know you don't post mates over 13 >moves deep! I thought maybe you had changed your solver. > >>I see that you have almost no competition here. Your selective look like to be >>very effective. I still hope that somebody will come with Chess Master solution >>to see better your and mine position. >> >>What was your time here? > >07:28 WM13 13 Nexc6+ Qcxc6 Qgxf6+ Qxf6 Qexf6+ Qxf6 Qxf6+ Ne7 Ra8+ Nxa8 Rxa8+ >Qxa8 Qxa8+ Qcc8 Ba5+ Qcc7 Bxc7+ Qxc7 Nxe6+ Rxe6 Qhd5+ Rd6 Qfxd6+ Qxd6 Qxd6# > >So no bug, mine just took the long way home first ... Hi, Chest confirms the above: #13 with a unique key move: PV: Nexc6+ Qcxc6 Qgxf6+ Qxf6 Qhxf6+ Qxf6 Qxf6+ Qe7 Qxe7+ Nxe7 Nxe6+ Nxe6 Ra8+ Nc8 Rxc8+ Kxc8 Nxd6+ Kd8 Nxc4+ Qxd5 Qxd5+ Kc8 Ba6+ Kb8 Qb7# (K7/600, 30MB hash, 57.2 minutes) # 1 0.00s 0kN 0.87 1- 0 # 2 0.00s 0kN 1.00 1- 0 # 3 0.01s 0kN [ 7.42] 0.92 63- 0 # 4 0.03s [ 3.00] 2kN [ 3.71] 1.12 190- 0 # 5 0.09s [ 3.00] 6kN [ 3.29] 1.53 348- 0 # 6 0.25s [ 2.78] 18kN [ 3.12] 2.03 861- 0 # 7 0.83s [ 3.32] 63kN [ 3.43] 2.51 2897- 0 # 8 1.98s [ 2.39] 155kN [ 2.46] 3.12 6827- 0 # 9 6.11s [ 3.09] 489kN [ 3.17] 3.69 22121- 0 # 10 23.47s [ 3.84] 1850kN [ 3.78] 3.87 100289- 1 # 11 112.24s [ 4.78] 8475kN [ 4.58] 4.60 516316- 6868 # 12 501.96s [ 4.47] 31935kN [ 3.77] 4.53 3036282- 2249851 # 13 3434.74s [ 6.84] 208426kN [ 6.53] 4.69 20984850- 20198419 >>Mine by brute force took 1 hour and 50 min for 12 moves to say "No". Selective >>in 13, took 9 seconds. > >That's pretty fast ... :) ... but not yet optimal :-)) Cheers, Heiner
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