1...h6 has the simple idea of 2.f4?? g6 , trapping the queen. White is left without a natural plan.

Destroying the enemy queenside.

With the double idea of 6...Rxc5 and 6...d3 followed by ...Qd4. Black went on to win.

Securing the king from a check on f7 before getting on with his own attack.
1...Nf3+? 2.Bxf3 exf3 3.Qxf7+-
1...Rf8 2.Qd5! Nf3+ 3.Bxf3 exf3 4.Qg5+-

2.f4 exf3 3.Bxf3 Nxf3+ 4.Kf2 Nd2! -+

Intending ...Rac8-c6-g6 with a strong attack.

A prophylactic retreat that lets White react in different ways to Black's two main options, 1...b5 and 1...Nb6.

1...b5? 2.d5! exd5 3.Nxd5 with a strong initiative.

2...Nbd5 would be better although after 3.Qf3 Qd6 4.Bg5 White also would exert considerable pressure.