34 Qc8-c2+ behind White d2-rook to reinforce attack on e2-rook Van Wely vs Judit Polgar, 2007  (E17) Queen's Indian, 40 moves, 0-1 38 .. Qg5-h4+ reinforces attack on White e1-rook from g3-bishop Carlsen vs Ivanchuk, 2008  (E97) King's Indian, 46 moves, 1-0 23 Qf3-h3+! reinforces attack on loose h8-rook thru h7-rook Marshall vs Spielmann, 1908  (A83) Dutch, Staunton Gambit, 22 moves, 1-0