Yudasina,Irina vs. Ostrovsky,A (chess problem)

After the 40th move, the position is like this. . The white plays and wins. Can you find out how ?

Yudasina,Irina
vs.
Ostrovsky,A

1996,  [Click:ch-ISR (women)] - Round 7,  Jerusalem,  ECO [Click: C24]

Bishops opening: Berlin defence

1.e4 e5 2.Bc4 Nf6 3.d3 d6 4.Nf3 Be7 5.c3 O-O 6.h3Nc6 7.Bb3 h6 8.Nbd2 d5 9.Qe2 Re8 10.O-O Bc511.Re1 dxe4 12.dxe4 Qe7 13.Nh4 Ng4 14.hxg4 Qxh415.Bxf7+ Kxf7 16.Qc4+ Be6 17.Qxc5 Bxg4 18.Nf1Rad8 19.b4 Rd6 20.b5 b6 21.Qc4+ Be6 22.Qe2 Na523.Ng3 Bg4 24.Qc2 g6 25.a4 Red8 26.Be3 Nc4 27.Nf1Nxe3 28.Rxe3 R8d7 29.c4 Rd4 30.c5 Bd1 31.Qa2+Kg7 32.Qe6 Re7 33.Qc6 Bxa4 34.cxb6 axb6 35.Ng3Rd6 36.Qc4 Rd4 37.Qc6 Rd6 38.Qc4 Rd4 39.Qc6 Red740.Rae1 Qf6