omg I'm retarded, never mind

need to take a break before I keep missing the obvious.

wrote:
Can someone shed some background on this game:

http://www.chessgames.com/perl/chessgame?gid=1070913

At move 40:

Deep blue: Qb6

Why didn't Kasparov move bishop - C5+??? Deep blue would then have no
choice but to trade the queen for the bishop.