Author: Heiner Marxen
Date: 11:30:09 04/06/00
Go up one level in this thread
On April 06, 2000 at 04:27:16, Bernhard Bauer wrote: >On April 04, 2000 at 18:27:01, José Antônio Fabiano Mendes wrote: > [snip] >> >> A.A.Troitzky[Chess Studies,1937(page 126)] >>[D]2k5/8/3KN3/2NNN3/8/8/3q4/8 w - - >>Troitzky puts this position forward as a standard one for >>forcing a win with four knights against a queen.He writes, >>"The win is achieved by moving the whole position to the >>left."This is the method wherever the black queen is >>situated and provided the black king is on a7,a8,b8 or c8. >>Source:"Test Tube Chess",A.J.Roycroft,1972,page 214,Stackpole Books > >MyCrafty gives a mate in 10 > > (4) 13-> 1:29 11.31 1. Nc4 Qh2+ 2. Kc6 Kb8 3. Nd4 Qh3 4. > Ncb6 Qh7 5. Ncd7+ Qxd7+ 6. Kxd7 Ka7 > 7. Kc8 Ka6 8. Nc4 <HT> > 14 1:48 ++ 1. Nc4!! > (3) 14 5:12 Mat11 1. Nc4 Qh2+ 2. Kc6 Kb8 3. Nd6 Qc2 4. > Nb4 Qh7 5. Nba6+ Ka7 6. Nc8+ Ka8 7. > Nec7+ Qxc7+ 8. Nxc7+ Kb8 9. Nb6 Ka7 > 10. Nb5+ Kb8 11. Ncd7# <HT> > 14-> 6:03 Mat11 1. Nc4 Qh2+ 2. Kc6 Kb8 3. Nd6 Qc2 4. > Nb4 Qh7 5. Nba6+ Ka7 6. Nc8+ Ka8 7. > Nec7+ Qxc7+ 8. Nxc7+ Kb8 9. Nb6 Ka7 > 10. Nb5+ Kb8 11. Ncd7# <HT> > 15 7:30 Mat10 1. Nc4 Qh2+ 2. Kc6 Kb8 3. Nd6 Qc2 4. > Nb4 Qh7 5. Nd7+ Qxd7+ 6. Kxd7 Ka7 7. > Kc6 Kb8 8. Kb6 Ka8 9. Nc7+ Kb8 10. > Nc6# > (2) 15-> 10:39 Mat10 1. Nc4 Qh2+ 2. Kc6 Kb8 3. Nd6 Qc2 4. > Nb4 Qh7 5. Nd7+ Qxd7+ 6. Kxd7 Ka7 7. > Kc6 Kb8 8. Kb6 Ka8 9. Nc7+ Kb8 10. > Nc6# > 16 14:50 Mat10 1. Nc4 Qh2+ 2. Kc6 Kb8 3. Nd6 Qc2 4. > Nb4 Qh7 5. Nd7+ Qxd7+ 6. Kxd7 Ka7 7. > Kc6 Kb8 8. Kb6 Ka8 9. Nc7+ Kb8 10. > Nc6# > time=15:00 cpu=201% mat=3 n=663078447 fh=10% nps=736532 > ext-> checks=45157171 recaps=0 pawns=0 1rep=2074505 thrt:59900 > predicted=0 nodes=663078447 evals=1 > endgame tablebase-> probes done=655803 successful=571374 > SMP-> split=1705 stop=168 data=9/256 cpu=30:17 elap=15:00 > >mate in 10 moves. >Kind regards >Bernhard Chest 3.19 confirms this: 1.Nc4 is the unique key move to force a mate in 10. And Qh2+ is the best answer, all other moves lead to shorter mates. This is the main line of Chest: Nc4 Qh2+ Kc6 Kb8 Na3 Kc8 Nb5 Qg2 Nd6+ Kb8 Nd7+ Ka7 Nb5+ Ka6 Nec5+ Ka5 Nb7+ =*= Ndc5# [25 minutes on PIII/550 with 512MB cache, no EGTBs] Heiner
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