Author: Heiner Marxen
Date: 08:42:31 02/16/01
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On February 16, 2001 at 08:18:38, Uri Blass wrote: >On February 16, 2001 at 06:42:19, leonid wrote: > >>Hi! >> >>If you like to relax by solving short and easy mate then this is just for you: > >> >>[D]1qNqkqNq/1r1nbn1r/1QQ1q1QQ/1qn1Q1nq/BQ2b2B/3Q1Q2/4Q3/3RKR2 w - - >> >>Please, indicate your result. > > >I tried to solve it for a 3 minutes without success . > >You ask if you like to relax by solving short and easy mate so I assume that it >was meant for humans because I do not see how humans can relax from the fact >that a chess program can solve it. > > >Junior5.9 found that Qxf8+ is a mate in 7 > >I used Junior to generate a proof for it and her is the proof > >1.Qxf8+ Kxf8[Bxf8 2.Qcxe6+ Ncxe6(2...Qe7 or 2...Be7 3.Qxe7+ and 4.Qxe7#) and >after 2...Ngxe6 3.Qxd8#) 3.Qxf8+ Kxf8(Ndxf8 4.Qdxd8#) 4.Qxd8+ Nexd8 >5.Qe7#]2.Qxd8+ Bxd8 3.Qbxc5+ Qxc5 4.Qcxc5+ Qed6 5.Qcxd6+ Qxd6(5...Be7 6.Qdxe7#) >6.Qdxd6+ Be7 7.Qexe7# > >Possible alternatives for black: > >Alternatives at move 3: >3...Ke8 4.Qcxe6+ Nxe6(or Be7 5.Qexe7#) 5.Qexe6+ Be7 6.Qcxe7# >3...Qed6 4.Qc6xd6+ Qxd6(or Be7 5.Qdxe7#) 5.Qcxd6+ Be7 6.Qexe7# >3...Qbd6 4.Q6xd6+ and now >a)Qxd6 5.Qcxd6+ Be7 Qexe7# >b)Be7 5.Qxe7+ Qxe7 6.Qexe7# >c)Ke8 5.Qf8+ Nxf8 6.Qxd8# >d)Qe7 5.Qdxe7+ Bxe7 6.Qexe7# >3...Qe7 4.Qexe7+ Bxe7 5.Qxe7# >3...Nc5 4.Qxd8+ Qe8 5.Qexe8# >3...Be7 4.Qxe7+ Qxe7 5.Qxe7# > >Alternatives at move 4: > >4...Qbd6 5.Qdxd6+ and now > >a)5...Qxd6 6.Qcxd6+ Be7 7.Qdxe7# >b)5...Be7 6.Qxe7+ Qxe7 7.Qcxe7# >c)5...Qe7 6.Qdxe7+ Bxe7 7.Qcxe7# >d)5...Ke8 6.Qf8# > >4...Ke8 5.Qxd7+ Rxd7 6.Bxd7# >4...Nxc5 5.Qxd8+ Qe8 6.Qexe8# >4...Qe7 5.Qcxe7+ Bxe7 6.Qxe7# >4...Be7 5.Qxe7+ Qxe7 6.Qxe7# Perfect! Chest confirms all this (I checked it manually). (less than 2 minutes on K7/600) >I think the mate in 50 that somebody else posted is clearly more easy for me. >Only writing the solution of this mate took me more than 10 minutes and I am not >sure that there are no mistakes(I was too lazy to check it). > >Uri I agree. While Leonid's problems are great stuff for my program, they are not much fun for myself, they are just too complicated for me. I suspect it is more fun to compose them ;-) Heiner
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