Author: blass uri
Date: 12:24:21 06/07/99
Go up one level in this thread
On June 07, 1999 at 14:39:28, Dann Corbit wrote: >On June 07, 1999 at 06:32:39, Harald Faber wrote: > >>On June 04, 1999 at 12:13:59, Eran wrote: >> >>>Since Junior5 does not have underpromotion code, I am wondering whether next >>>version of Junior, probably Junior 6, will have underpromotion code, won't it? >>>Well, basically all strongest chess programs should be 100% state of art, right? >>>In other words, since Junior5 does not have underpromotion code, it cannot be >>>100% state of art, is it? >>> >>>Eran >> >>How often did you have a position where underpromotion was best move? >> >>I don't miss this "feature". >In my database (for which basically all positions are from actual games) I have >218 promotions where promotion to knight is clearly the best move, 85 where >promotion to bishop is the best move, and 147 promotions to rook. Consider the >following: >6n1/5P1k/7p/np4b1/3B4/1pP4P/5PP1/1b4K1 w - -; ce 32766; pv f8=N#; bm f8=N#; id f8=Q is also winning so knowing about underpromotions is not practically important >"BWTC.0907"; >4K3/5P1k/8/8/7N/8/8/8 w - -; ce 32758; pv f8=B Kg8 Nf3 Kh7 Kf7 Kh8 Bg7+ Kh7 >Ng5#; bm f8=B; id "IMCP.015"; In this position Junior finds Ke7 that is also winning >4K3/3P4/3kN3/8/4PP2/8/8/8 w - -; ce 32762; pv d8=R+ Kc6 Rb8 Kd6 Rb6#; bm d8=R+; >id "IMCP.070"; Here d8=Q+ is also winning. The question is what is the number of cases when underpromotion changes the practical result of the game and not the number of cases when underpromotion is the shortest way to win. Uri
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