Author: Robert Hyatt
Date: 09:59:59 11/15/00
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On November 15, 2000 at 11:02:42, pavel wrote: >On November 15, 2000 at 10:51:16, Robert Hyatt wrote: > >>On November 15, 2000 at 10:47:23, Wayne Lowrance wrote: >> >>>Kees, what is the f6 problem with the tiger. ? >>>Thanks >>>Wayne >> >> >>It doesn't understand that if white gets a pawn to f6, with the g-pawn moved >>to g6 or even removed from the board, then a queen at h6 is difficult to >>handle. In the first game discussed, that was the problem. There are several >>variations... all based on the black pawn formation h7 g6 f7 and e6/e5. If >>a pawn/bishop reaches f6, then a queen on h6 is almost always fatal. Same for >>the pawn/bishop on h6, although it is a bit easier to defend since you now need >>to cover f6 to prevent the queen from entering there. But f6 is easier to >>defend than h6. >> >>This makes a class of positions that also hurts null-move programs, as a null- >>move can take the position WQh6/WPf6 to the q-search where the mate might not >>be seen. This leads to grossly wrong search results. > >is it possible to give an example postion? >would be helpful to understand. > >thanks >pavs Here is an example: [D]5nk1/pppq1p1p/4pPp1/3p4/3P1Q2/2N5/PPP1P1PP/6K1 w white will play Qh6 and black then has a huge problem. You can add lots of other pieces on the board without changing the overall problem.
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