Black to Play and Defend

[FEN "6k1/2q4p/2p3pP/2Nb1pQ1/8/5P2/r5P1/4R1K1 w - - 0 38"]
38. Qf6 Ra8 39. Nd7 Qxd7 40. Re7 {Now instead of Wxe7 as in the game.} 40... Qa7+ {An incredible move and it works. RxQ and with the mate on g7 covered White can make no progress. See how the actual game finished. in this line it cannot be repeated.} 41. Kh2 {Now what? Qb8+ is no good but....} 41... Qa1 {Stops Qg7 mate. Best now seems...} 42. Re8+ Rxe8 43. Qxa1 Re7 {And there is no forced win Thje Bishop and Rook will easily keep the Queen at bay.}