In game 11 of the 1972 World Championship, Spassky as white moves his Knight back to its
14. Nb1 starting position. Apparently, this moved was received as
14. Nb1!!. But to me, it seems as a simple attack on the invading black queen to flush her out of the zone.
What about this move makes it so interesting?
Shown below is after move
13. Kh1 Bd7
[FEN "r3kb1r/1p1b1p2/p1nppp1p/8/4PP2/qNN5/P1PQB1PP/R4R1K w - - 0 1"]