Horton-Ruiz Diez, Casino Jaque v Ibercaja B, Aragón Team Championship 2009, position after Black's 41...Qa4-b3.
Play now proceeded 42.Qd7 Qc3 43.Qd4 Qa3 44.Qd7 Rc5 45.Qd8+ Kh7 46.Qd2 Qb2 47.Kg2 Qb7+ 48.Kh2 Qc6 49.Qd3+ g6 and White later lost - though if he'd sat tight with the queen on d2 he might very well not have. But in the above sequence, what did both players miss?
(The complete game is given below.)
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