This maneuver is typical of the sort of Pirc position which arose in Bryne-McShane, Malmo 2003 . In that case the (almost forced) queen transfer from the d-file was less successful.
Here White was not so much aiming for the a2-g8 diagonal, but for a more active location for the queen in general.
The liquidation of central pawns and rooks has led to a symmetrical pawn structure, but White still has some pressure with his pair of bishops. He managed to turn his advantage into a win.
Creeping Queens (part Two)
The French Defence features a similar maneuver.
The French Defence features a similar maneuver.
This move, paving the way for the queen to go to h7, is usually preceded by the closure of the center by ...c5 -c4.
This move shouldn't have come as a surprise for White considering Black's last. He now retreats his knight to limit the activity of Black's queen.