Author: Enrique Irazoqui
Date: 15:37:23 12/22/99
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On December 22, 1999 at 17:50:32, Djordje Vidanovic wrote: >On December 22, 1999 at 14:10:56, Dann Corbit wrote: > >>Have a look at this tremendous checkmate Chest found from the famous 1924 New >>York Chess Club championship: >>2r3k1/5ppp/7r/Q7/3P1p2/1N3Pnq/PP3K1P/R5R1 b - - acd 10; acn 535351375; acs >>15279; bm Ne4+; ce 32750; dm 9; id "C.A.P. 812153"; pv Ne4+ fxe4 Qe3+ Kf1 Rxh2 >>Rxg7+ Kxg7 Qe5+ f6 Qe7+ Kg6 Qxf6+ Kxf6 e5+ Kg6 e6 Qf2#; >> >>I will be amazed if any general purpose program (or even most GM's) can find it. > >Another super fast mate in 10: Chessmaster 7000 comes up with -9.90 (mate in >10) after only 15 seconds. I wish I had the Tasc 2.1 CD handy (at a friend's >place), I am almost sure that its time would be unbeatable. What's this about >mate in 9 then? All the progs see the same first five or six plys as Chest. >The divergence is only later, with Nd2. I can see how Zarkov's line differs, but >then Zarkov did not see the mate in 9, it only found a mate in 13, or something >like that (99.70 :)): > >Zarkov 4.30 > >PV: Ne4+ fxe4 Qe3+ Kf1 Qf3+ Qe3+ is the shortest way to mate, I think. > Ke1 Rxh2 Rxg7+ Kxg7 Qe5+ f6 Qe7+ Kg6 Nd2 Rh1+ Nf1 >Rxf1+ Kd2 Rxa1 Qxf6+ > >Djordje It is a mate in 9 in all variations. The programs I tried find at best a mate in 10. The fastest to pick Ne4+ so far has been Rebel Century: 4 seconds at ply 5, mate in 10 in 79'', ply 8. But no mate in 9 found. :( Enrique
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