h2 h7 continued

D4 games with a breakthrough on h7.

From Polgar's book "Chess"

Interesting d5 pawn break in that game.

To generalize on this and the last two games,  White gets a knight to f5 or e5 before punching in on h7.  A bishop or a rook is available to swing in on h5 after the break.  Black's bishop on e7 shut him in and keep the queen out of the action.