 White tried 29.Qa8+ Rf8 30.Rg5 (right-most diagram), but now 30...Qe4!, the "marvelous Marshall masher", ended the game, since 31.Qxe4 allows 31...Rf1#.In Zukertort–Steinitz, London 1883, the future world champion, playing Black, had a difficult, possibly lost, game an down, with his centralized king subject to attack by White's queen and two rooks.He played 27...Qd4+!