Author: Dave Gomboc
Date: 06:21:19 06/08/99
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On June 08, 1999 at 03:23:30, blass uri wrote: > >On June 08, 1999 at 00:56:53, Dave Gomboc wrote: > >>On June 07, 1999 at 20:29:58, Dann Corbit wrote: >> >>>On June 07, 1999 at 20:20:25, Dave Gomboc wrote: >>>[snip] >>>>At least for the present, it is only an opinion. >>>> >>>>Minimax has a way of removing the horrible error in end-point evaluations. It's >>>>pretty rare that missing an underpromotion will actually hurt you. >>>In the sample I examined, about 7% of the time it scores lower than always >>>queening. I can send a list of such EPD's to anyone who would like a copy. >> >>Your sample includes only games in which promotion actually occurs, and the 7% >>includes many positions where promoting to a rook might be slightly better, but >>if the person playing had overlooked the possibility to underpromote, they could >>have still won the game my promoting to a queen, either with the same move >>sequence, or a different one. The important figure would represent how often >>the rough evaluation of a position (e.g. clearly winning) depends upon a >>promotion, and how many of these cases there are in which a queen will never >>work. >> >>When you look for this, now you are counting practically every winning ending -- >>and many winning middlegames -- with pawns on the board that gets resigned. I >>do not have a statistic to back up my thoughts on this matter, but I am >>extremely confident that the rate of "necessary underpromotions" will be far >>less than 7%. 0.0007% would be more like it. >> >>Dave > >I am sure that it happens more than 0.0007% > >I did not do statistics about it but I think that Junior lose points because of >not seeing underpromotions in more than 1 game out of 1000 but clearly less >than 1 game out of 100. > >Uri Well, I'll defer to your judgement on the issue. You use Junior every day, it seems. Dave
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