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Subject: A hideously hard test position?

Author: Robin Smith

Date: 21:49:21 06/05/01


From a recently completed game in the 24th world correspondence chess
championship semi-finals:

[D] r1qr2k1/pb2bpp1/1p2pn1p/2p4P/3P1B2/2PB1N2/PP2QPP1/1K1R3R w - -

Here the move 15.Rhg1 is very strong, as it gets the rook off the long diagonal
and threatens to charge the g-pawn down the board.  But computers don't often
like to give up material .... in this case the h pawn and after 15.Rhg1! Nxh5
16.Bxh6! also the bishop.  Can any program find 15.Rhg1?  I believe it may win
by force, and if not it certainly leaves black in big trouble, but all programs
I tested don't find it, even over night.  If that is too hard, try the position
after 15.Rhg1 Nxh5.

Robin Smith



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