39 Rd8-g8+! based on the undef Black c7-rook, d8-tactical base M Rodshtein vs I Caspi, 2008  (E94) King's Indian, Orthodox, 39 moves, 1-0 49 .. Qe1xRf2+! undef White d6-queen make e4-base for f6-knight D Flores vs Radjabov, 2005  (A26) English, 49 moves, 0-1 28 Rc8-h8+! made possible only by the undefended Black d6-queen N Sakr vs Ali Atwi, 2001  (A10) English, 27 moves, 1-0 34 ... Qe7-g5? undef g5-queen gives White d6-knight f7-base Anand vs Leko, 2009  (C95) Ruy Lopez, Closed, Breyer, 36 moves, 1-0 27 ... Qd1-h1+! undef White e4-queen target for Black g4-knight G Welling vs P K Wells, 2007 (D02) Queen's Pawn Game, 40 moves, 0-1 26 Nc4-b6! undefended Black f6-rook target for White e5-knight Carlsen vs Karjakin, 2009  (D11) Queen's Gambit Declined Slav, 79 moves, 1/2-1/2 6 games