Lowintermediate: Real basic comments--please correct!
9 Bf4, grabbing a nice diagonal and gaining control of Black's hole at e5
10 ... Qh5 Black begins kingside attack characteristic of Dutch Stonewall
11 Rae1 White announces intention to push e4, but Black's attack is quicker due to the lengthty buildup White needs to play e4 favorably
14 ... Nxe5, Black frees his cramped position and eliminates a main threat to his weak black squares, including h8, to which his king will retreat. The pawn recapture gives white firm control of d6 and f6, but it also shields Black's backward e-pawn and closes the a1-h8 long diagonal, giving Black's king more protection.
15 ... f4, Black prepares to open lines for his rooks
17 ... Kh8, Black moves his king to further safety while opening up g8 for a rook
23 Qxf4?? would lose the Q to Ng3+
23... Rfg7, Black trades a pawn for a tempo. Note how by Black's next move, White's pieces are in basically the same positions while Black has moved a rook from f7 to g4--essentially 2 moves for one, gained by offering the gambit pawn
24 ... Nxf3, Black eliminates the main defender of the White's h-pawn. Mate is threatened on the h file (and has been for a while).
25 ... Bg5, White must lose the queen or be mated after ... Bf4
Note how White's queen was kept out of the defence, while only Black's white-square Bishop was not in the attack.