This was one of those situations where you just have to keep up the pressure, and not balk under a counter-attack. Lahlum attacked the queen with 23...Nf3-g4. Instead of going for a line like 24. Qg5 Qg5 25. Rg5 Bd7 26. Rg3 Nh2 27. Bd5, Epishin snatched the knight with 24. Rg4 fg4 25. Nd5 and black has a problem. The black queen has to guard against mate on g7 and also protect the rook on f8. That leaves black with nothing else but 25...Qf7. Epishin's winning salvo 26. Rf6 caused his opponent's resignation. 1-0. If 26...Qg7, then 27. Rf8+ wins anyway.