Author: Heiner Marxen
Date: 13:43:50 03/12/00
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On March 12, 2000 at 15:54:16, Robert Hyatt wrote: >On March 12, 2000 at 15:39:57, John Coffey wrote: > >>[D]1Q6/K7/8/3k4/8/8/8/8 w - - >> >>I had this position in a game and I wondered what the shortest route to mate >>is. I have seen methods by which one advances the king first and other methods >>where one advances the queen first. >> >>I think that Qf4 might be the best move although I can't prove it. >> >>I gave the problem to Fritz6 thinking that it would either know the answer >>immediately or would be able to find it quickly. After some searching it came >>up with mate in 31, but after playing a move or two it quickly turned into mate >>in 9. >> >>After searching several hours Fritz came up with Qb4 mate in 26. I don't know >>if that is the fastest solution since I have heard that one can mate with this >>in less than 20 moves. >> >>John > >Here is the right answer: > >White(1): egtb ! >1. Qf4! Kc5 2. Qe4 Kb5! 3. Qd4 Ka5 4. Kb7! Kb5! 5. Kc7! Ka5! 6. Kc6! >Ka6! 7. Qb6# > >Obviously a mate in 7. Moves with a ! after them are the _only_ move that >provides the best resistance (all other moves there result in a shorter >mate). > >(the above is output from Crafty). Just a remark regarding the exclamation mark notation: the moves 4... Kb5 and 6... Ka6 are the only legal moves for black in the respective positions. Therefore I would like to not mark them with an exclamation mark, since they are better than all others simply because there are no others. If there is an annotation for "the only legal move" I would use that. In PGN I find just 2 NAGs 7 forced move (all others lose quickly) 8 singular move (no reasonable alternatives) which do not quite fit. Would others object? Suggestions for a new annotation? Heiner
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