Author: Heiner Marxen
Date: 11:44:06 08/13/00
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On August 12, 2000 at 13:41:39, Heiner Marxen wrote: >>>[D]8/PPPPPpPk/3rq3/1b1r2b1/2BR1B2/3RQ3/pppppPpK/8 w > >>g8Q+ forces mate in 12(Junior) >> >>1.g8Q+ Kxg8 2.e8Q+ is the beginning of the main line. >> >>Junior5.9 does not consider underpromotions but I believe that underpromotions >>cannot save black. > >Just for fun I have started Chest on this one (K7/600 350MB TT). After 184 >seconds it finds there is no mate in 9, so a mate in 12 may take some time. >I'll tell you more when Chest has finished searching for mate in 12. > >Heiner After a little bit more than 24 hours later Chest has finished 12-mate analysis: Yes, 1.g8=Q+ is the unique solution in 12 moves. Congratulations to Junior, it really found the shortest mate. I had instructed Chest to print the solution tree (completely)... boy is that tree huge!! I Never saw such a beast. 1.3 million lines. 32+ MB. The last 6 hours (of the 24) Chest were busy completing and printing just the solution tree. I cannot even give the PV, it is hidden there, somewhere. Well, there is still room to improve the solution printing function of Chest. So - in a way - this was hard for the problem solver, also. Hey, that was fun! :-) Heiner
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