26 a2-a3 blocks a-file of Black a5-queen,a6-rook to a2-square Carlsen vs Radjabov, 2008  (B78) Sicilian, Dragon, Yugoslav Attack, 10.castle long, 37 moves, 1-0 35 Rc2-c4 blocks the diagonal a6-f1 @ c4 to prevent ... Qb5-f1# Ivanchuk vs Aronian, 2009  (D45) Queen's Gambit Declined Semi-Slav, 35 moves, 1-0 2 games