On the threshold of the Najdorf, rather than playing one of the common bishop moves, or moving the f pawn a square or two, Robson played 6.h3, inviting a Keres Attack, which was accepted. Fischer-inspired? Fischer played 6.h3 three times in 1962, with one of those games being against Najdorf himself. Fischer won all three. For the record, I find the move played for the first time by Weaver Adams in 1948. 6.h3 now appears a little more than 1700 times in the Mega 2010 database, which amounts to about 1 1/2 percent of the time. Here's a partial snapshot of the ChessBase 10 opening report for 6.h3, and which provides a glimpse of a good ChessBase tool.