Author: John Merlino
Date: 11:03:34 04/19/02
Go up one level in this thread
On April 19, 2002 at 13:53:03, Roy Eassa wrote: >On April 19, 2002 at 13:49:34, John Merlino wrote: > >>On April 19, 2002 at 10:49:07, Roy Eassa wrote: >> >>>On April 19, 2002 at 07:36:17, Ignacio Santos Crespo wrote: >>> >>>>On April 19, 2002 at 07:33:45, Ignacio Santos Crespo wrote: >>>> >>>>>On April 18, 2002 at 23:20:40, K. Burcham wrote: >>>>> >>>>>> >>>>>>Mate in 11. >>>>>>composed by John Kaan >>>>>> [D] rn1b2rk/1pp3p1/qp1p2R1/5Q2/3RN2P/1PP5/3PbP2/4K3 w - - 0 1 >>>>>>very difficult for some programs. >>>>>>kburcham >>>>> >>>>>CM8000 ss=12 on Athlon 1200 23 seconds >>>>> >>>>>Time Depth Score Positions Moves >>>>>0:00 1/5 0.00 116295 1. Rdxd6 cxd6 2. Nxd6 Re8 3. Nf7+ >>>>> Kg8 4. Nh6+ Kh8 5. Nf7+ >>>>>0:02 1/6 6.98 339567 1. Rdxd6 cxd6 2. Nxd6 Re8 3. Nxe8 >>>>> Nd7 4. Qxd7 Qa1+ 5. Kxe2 Bf6 6. >>>>> Nxf6 Qa6+ 7. c4 >>>>>0:09 1/7 16.96 1519936 1. Rdxd6 cxd6 2. Nxd6 Re8 3. Nxe8 >>>>> Nd7 4. Rxg7 Qa1+ 5. Kxe2 Qf1+ 6. >>>>> Kxf1 Ra1+ 7. Ke2 Re1+ 8. Kxe1 Nf6 >>>>> 9. Rxb7 >>>>>0:23 1/8 Mate11 4077834 1. Rdxd6 cxd6 2. Nxd6 Re8 3. Nxe8 >>>>> Nd7 4. Rxg7 Qa1+ 5. Kxe2 Qf1+ 6. >>>>> Kxf1 Ra1+ 7. Ke2 Re1+ 8. Kxe1 Nf6 >>>>> 9. Qg6 Be7 10. Rh7+ Nxh7 11. Qg7# >>>>>0:35 1/9 Mate11 6809341 1. Rdxd6 cxd6 2. Nxd6 Re8 3. Nxe8 >>>>> Nd7 4. Rxg7 Qa1+ 5. Kxe2 Qf1+ 6. >>>>> Kxf1 Ra1+ 7. Ke2 Re1+ 8. Kxe1 Nf6 >>>>> 9. Qg6 Be7 10. Rh7+ Nxh7 11. Qg7# >>>>>1:16 1/10 Mate11 12865191 1. Rdxd6 cxd6 2. Nxd6 Re8 3. Nxe8 >>>>> Nd7 4. Rxg7 Qa1+ 5. Kxe2 Qf1+ 6. >>>>> Kxf1 Ra1+ 7. Ke2 Re1+ 8. Kxe1 Nf6 >>>>> 9. Qg6 Be7 10. Rh7+ Nxh7 11. Qg7# >>>> >>>>And CM El Rey 8 seconds >>>> >>>>Time Depth Score Positions Moves >>>>0:00 1/3 -3.79 2461 1. Ra4 Qb5 2. Qxb5 Bxb5 3. Rxa8 >>>> Bxh4 >>>>0:00 1/3 -3.23 5523 1. Qe6 Kh7 2. Ra4 Bxh4 3. Rxa6 Bxa6 >>>>0:00 1/4 -2.84 16492 1. Qe6 Kh7 2. Ng5+ Bxg5 3. Rxg5 >>>> g6 4. Ra4 Bc4 5. Rxc4 Qa1+ 6. Ke2 >>>>0:00 2/5 -2.84 55387 1. Qe6 Kh7 2. Ng5+ Bxg5 3. Rxg5 >>>> g6 4. Ra4 Bc4 5. Rxc4 Qa1+ 6. Ke2 >>>>0:00 2/5 0.00 110418 1. Rdxd6 cxd6 2. Nxd6 Re8 3. Nf7+ >>>> Kg8 4. Nh6+ Kh8 5. Nf7+ >>>>0:02 2/6 8.28 344796 1. Rdxd6 cxd6 2. Nxd6 Re8 3. Nxe8 >>>> Nd7 4. Qxd7 Qa1+ 5. Kxe2 Bf6 6. >>>> Nxf6 Qa6+ 7. c4 >>>>0:08 3/7 Mate11 1682819 1. Rdxd6 cxd6 2. Nxd6 Re8 3. Nxe8 >>>> Nd7 4. Rxg7 Qa1+ 5. Kxe2 Nf6 6. >>>> Qg6 Qf1+ 7. Kxf1 Ra1+ 8. Kg2 Rg1+ >>>> 9. Kxg1 Be7 10. Rh7+ Nxh7 11. Qg7# >>>>0:16 3/8 Mate11 3505773 1. Rdxd6 cxd6 2. Nxd6 Re8 3. Nxe8 >>>> Nd7 4. Rxg7 Qa1+ 5. Kxe2 Nf6 6. >>>> Qg6 Qf1+ 7. Kxf1 Ra1+ 8. Kg2 Rg1+ >>>> 9. Kxg1 Be7 10. Rh7+ Nxh7 11. Qg7# >>>>0:38 4/9 Mate11 8323309 1. Rdxd6 cxd6 2. Nxd6 Re8 3. Nxe8 >>>> Nd7 4. Rxg7 Qa1+ 5. Kxe2 Nf6 6. >>>> Qg6 Qf1+ 7. Kxf1 Ra1+ 8. Kg2 Rg1+ >>>> 9. Kxg1 Be7 10. Rh7+ Nxh7 11. Qg7# >>> >>> >>>By what magic is CM8000 (any version or setting) able to see the mate so >>>quickly? In the PV, White does not even give check until move 10! >> >>For the record, the default personality on a relatively low-end machine >>(PIII-600) finds it in 1:02.... >> >>Time Depth Score Positions Moves >>0:00 1/3 -2.72 2506 1.Ra4 Qd3 2.Rxa8 Bxh4 >>0:00 1/4 -2.72 9056 1.Ra4 Qb5 2.Qxb5 Bxb5 3.Rxa8 Bxh4 >>0:00 1/4 -2.35 23293 1.Qe6 Kh7 2.Ng5+ Bxg5 3.Rxg5 g6 >> 4.Ra4 Bc4 5.Rxa6 Bxe6 6.Rxa8 Bxb3 >>0:01 2/5 -2.35 66742 1.Qe6 Kh7 2.Ng5+ Bxg5 3.Rxg5 g6 >> 4.Ra4 Bc4 5.Rxa6 Bxe6 6.Rxa8 Bxb3 >>0:02 2/5 0.00 133710 1.Rdxd6 cxd6 2.Nxd6 Re8 3.Nf7+ >> Kg8 4.Nh6+ Kh8 5.Nf7+ >>0:04 2/6 6.98 414948 1.Rdxd6 cxd6 2.Nxd6 Re8 3.Nxe8 >> Nd7 4.Qxd7 Qa1+ 5.Kxe2 Bf6 6.Nxf6 >> Qa6+ 7.c4 >>0:17 3/7 16.96 1809227 1.Rdxd6 cxd6 2.Nxd6 Re8 3.Nxe8 >> Nd7 4.Rxg7 Qa1+ 5.Kxe2 Qf1+ 6.Kxf1 >> Ra1+ 7.Ke2 Re1+ 8.Kxe1 Nf6 9.Rxb7 >>1:02 3/8 Mate11 6826848 1.Rdxd6 cxd6 2.Nxd6 Re8 3.Nxe8 >> Nd7 4.Rxg7 Qa1+ 5.Kxe2 Qf1+ 6.Kxf1 >> Ra1+ 7.Ke2 Re1+ 8.Kxe1 Nf6 9.Qg6 >> Be7 10.Rh7+ Nxh7 11.Qg7# >> >>jm > > >John, that's pretty fast too, but I am honestly amazed that ANY verion of CM >with ANY settings can see such a long mate in under 10 seconds, especially since >there are no checks for the first 9 moves in the PV. > >Any comment on how a CM version was able to do that? Come on, what's your >secret? Well, actually, it's Johan's secret -- and I am not privy to it. However, it seems to me that the PV also includes many captures that might also be part of the fast mate search code (i.e. checking moves are not necessarily required). If you move the position up to before 4.Rxg7, all of Black's moves are forced attempts to prolong mate -- those are easy to find. So, I guess the "secret" lies somewhere in the first half-dozen plies? That's just a guess.... jm
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