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Smirin's Qh5 move

Tactics
White just played Qh5. Why?

image
What is White threatening? Afek plays ...a6 here and loses to a surprising move. PGN below.

[Event "ISR-ch"]
[Site "ISR"]
[Date "1992.??.??"]
[Round "11"]
[White "Smirin, Ilia"]
[Black "Afek, Yochanan"]
[Result "1-0"]
[ECO "B30"]
[WhiteElo "2555"]
[BlackElo "2365"]

1. e4 c5 (1... e5 2. f4 (2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3)) 2. Nf3 Nc6 3.
Bb5 (3. d4) 3... Qb6 4. Nc3 (4. O-O Qxb5) 4... Nd4 (4... g6 5. Nd5 Qxb5 6. Nc7+
Kd8 7. Nxb5) 5. Nxd4 cxd4 6. Nd5 Qd8 (6... Qxb5 7. Nc7+ Kd8) 7. Qh5 (7. O-O)
7... a6 (7... e6) 8. Qe5 (8. Bc4) 8... f6 (8... axb5 9. Nc7+ Qxc7 10. Qxc7) 9.
Nc7+ (9. Nxf6+) 9... Kf7 10. Qd5+ (10. Qd5+ e6 (10... Kg6) 11. Nxe6 dxe6 (11...
Qe7 12. Nc7+) 12. Qxd8) 1-0