He can only avoid mate on g2 with the help of the queen, but it is tied to the defence of the knight.
Unity Chess Club
Gudmundur Sigurjonsson Leonid Stein Reykjavik 1972 Black to move
White has not yet completed his development, and in the absence of the light-squared bishop, his pawn structure looks rickety.
This is the basis of Black’s whole idea. If he had to retreat the knight, White would entrench his knight on d4 and obtain the advantage, as the Bb7 would be too bad.
White also has a lot of weaknesses after 17.Bxd4 Bxf3 18.exf6 gxf6! 19.Bg1 Ba8.
White has a bad king, and his light squares are very weak – Black has a decisive advantage.
22.Ne4 Qxb3 23.Nxb3 Bxe4 24.dxe4 b5 25.axb5 axb5 26.g3 h5 27.Kg2 Bc3 28.Rab1 Rfd8 29.Rc2 Rc4 30.Kf3 Bxe5 31.Rxc4 bxc4 32.Na5 Rd3+ 33.Kg2 Rd2+ 34.Kf3 Bd4 35.Bxd4 Rd3+ 36.Kg2 Rxd4 37.e5 Rd2+ 0-1