Silman: 4...,f5; correctly wanting to push a pawn weakness, at the same time preparing the lon dark diagonal for his KB.
8.e3, restraint from JH who usually likes to explode the centre with an e4 push in this opening.
10...,Re8?!; There is plenty of time to play this move.
11.b5!, black no longer has the chance to play a successful ...,c5;
15.cxd5, creating a further imbalance of the pawn structure.
19..., Qe7;? Putting the queen in front of the rook strikes me as wrong. Preference should go to 19...,a6; putting pressure on whites b pawn. If 20.ba, ba; 21.Qxa6, black wins material with "21...,Bb5;!
27.Rxc7, material proof that blacks strategy with 19...,Qe7; was faulty.
34.Qc3, well spoted JH.
36.Rxe2, black is faced with loss of Q or mate.