Author: F. Huber
Date: 07:11:49 03/09/05
Go up one level in this thread
On March 09, 2005 at 07:07:26, James T. Walker wrote: >On March 08, 2005 at 16:35:44, Olaf Jenkner wrote: > >> 1.Le4-d3 Be5-e4 2.Ld3-e4 Be6-e5 3.Le4-d3 Be5-e4 4.Ld3-e4 Se8-d6 5.Le4-d3 >>Sd6-e4 6.Ld3-e4 Sg8-f6 >> 7.Le4-d3 Sf6-e4 8.Ld3-e4 La6-b7 9.Le4-d3 Lb7-e4 10.Tb4-b5 Td8-d5 11.Tb5-d5 >>Dh6-d6 12.Sf7-d6 Kf4-g5 >>13.Sd2-e4 Kg5-h5 14.Se4-f6 Be7-f6 15.Ld3-e4 Ta8-g8 16.Le4-f3 Tg8-g4 >>17.Lf3-g4/Bh3-g4# >> >>OJe > >Hello Olaf, >Since you claim it's a mate in 17 instead of 19 something is wrong somewhere! >Chest says it's mate in 19 and the first deviation from Chest in your line is >4....Nd6? Since this leads to a mate in 17 how can it be considered optimal? >Can you prove that Chest 4....e5 is not optimal? >Jim Hello Jim, well, there´s nothing wrong anywhere! ;-) _I_ am the ´problem´ (if you want to call it so), but not Chest. Since this mate problem was posted here as #19, and I also found this position already in my mate database (also as #19, but still ´unsolved´), I saw no reason to believe in a shorter solution. So I told ChestUCI: "look for a mate in 19"! And since I used the automatic-mode, it´s quite clear that it actually found only a mate in 19 - especially because the restriction parameter K for this #19 is lower (K1) than for the #17 (K2), and so the #19 was found earlier! I really don´t have the time (especially with my slow notebook) to always find out, if any mate posted here would have a shorter solution than stated, but of course _if_ I know of such a shorter solution, there´s absolutely no problem for ChestUCI to find this too - look at the following output: ChestUCI Ver.3.9: CPU: Celeron 400MHz FEN: r2rn1n1/4pN2/b3p2q/1p2pP2/pR1pBk1p/K4p1P/2PN1P2/2B5 w - - Search for Special-Mate [C0/R-3/K2/P8/X39] in 17 ... (Hash=64MB) 17 07:59 8.942.683 62.479 +M17 1.Bd3 Suche completed ... (Time=477.79s) Mate in 17 found ! (1 Solution in 07:57) 17/17 08:07 29.345.094 61.418 +M17 1.Bd3 e4 2.Bxe4 e5 3.Bd3 e4 4.Bxe4 Ngf6 5.Bd3 Ne4 6.Bxe4 Nd6 7.Bd3 Ne4 8.Bxe4 Bb7 9.Bd3 Be4 10.Rxb5 Rd5 11.Rxd5 Qd6+ 12.Nxd6 Kg5 13.N2xe4+ Kh5 14.Nf6+ exf6 15.Be4 Rg8 16.Bxf3+ Rg4 17.hxg4+ BTW, if you tell Gustav to look for a #19 (in automatic mode), he also finds only a #19 (and needs 18 minutes for the complete solution). Best regards, Franz.
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