Why black not took white Bishop on move no 29 ?


Who would want to invite the opposing queen into their castled position. It may not directly lead to mate, but it could lead to trouble. Black is actually in a tight spot, he is benind a pawn and one of his pawns is backward. Surely he doesn't want an opposing queen so close to his own king when trades might actually help White with a pawn endgame.
Besides, it gives up a tempo, maybe more as the Black queen has to go over to the kingside to defend.
Much better is to launch your own attack with moves like 29...Qc5 which attacks White's rook and centralizes the queen. Make it more complicated for White to win! =)
barefoot_player