Author: Dave Gomboc
Date: 12:12:06 03/13/00
Go up one level in this thread
On March 13, 2000 at 14:15:52, KarinsDad wrote: >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). > > >So why are there ! marks after white moves? Since black is performing the >resistance, it does not make sense that a white ! move means that it provides >the best resistance (rather, the shortest mate at the current position). > >KarinsDad :) > >PS. I couldn't resist being a smart---. > >PSS. After working on our program last night for 5 hours, my partner and I >managed to only fix 3 bugs (none of which are the reason for the major bug we >are really trying to fix). However, the good news is that my partner previously >put hash tables into the code behind my back. The bad news is that the main bug >we are trying to fix may be due to the hash table (and it is not yet coded to >simply remove hashing if desired). Sigh. > > >> >>(the above is output from Crafty). If there's an exclamation mark after White's move, it probably means that it's the only _winning_ move -- that other moves draw. Dave
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