Author: Dan Ellwein
Date: 16:38:29 04/19/02
Go up one level in this thread
On April 19, 2002 at 14:03:34, John Merlino wrote: >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 on a 400Mhz Celeron computer CMLite finds Mate in 11 in 25 sec... Time Depth Score Positions Moves 0:02 1/5 0.00 99362 1. Rdxd6 cxd6 2. Nxd6 Re8 3. Nf7+ Kg8 4. Nh6+ Kh8 5. Nf7+ 0:07 1/6 6.56 340987 1. Rdxd6 cxd6 2. Nxd6 Re8 3. Nxe8 Nd7 4. Qxd7 Qa1+ 5. Kxe2 Bf6 6. Nxf6 Qa6+ 7. c4 0:25 1/7 Mate11 1467600 1. Rdxd6 cxd6 2. Nxd6 Re8 3. Nxe8 Nd7 4. Rxg7 Qa1+ 5. Kxe2 Nf6 6. Qg6 Qe1+ 7. Kxe1 Ra1+ 8. Ke2 Re1+ 9. Kxe1 Be7 10. Rh7+ Nxh7 11. Qg7# CMLite Own Q 7.7 Opp Q 7.7 Own R 4.3 Opp R 4.3 Own B 2.6 Opp B 2.6 Own N 2.6 Opp N 2.6 Own P 1.0 Opp P 1.0 SS = 12
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