White’s offensive resources are limited to a queen and knight, which don't seem likely to be the makings of a decisive attack on an open board like this. But skewers flourish in such a climate. Work with your checks. White has two with his knight, both of which merely lose the piece. So consider White’s three others with his queen: Qh3, Qxg6, and Qd7. Qxg6 loses the queen; Qh3 causes Black to move his king to g8, and since White has no safe check to use as a follow-up, the results are inconclusive. The most interesting possibility thus is Qd7+: utterly safe, and it forces the king to h6. (If Black plays Kh8, White mates immediately with Qg7.) With the king on the move, and with Black’s queen in front of it and White’s queen now behind it, a skewering idea comes into view.

Keep working with checks. White can play Qg7+, and here the knight serves the same purposes the bishops did in earlier examples: it provides cover for the queen and cuts off flight squares for the king. The king’s only legal move is to h5. Just keep nudging it with checks. White plays Qh7+, and where can Black’s king go? Only to g4, as White’s knight seals off g5. Now Black’s king and queen are aligned, and White is ready to play Qxg6+. The king moves, and White wins Black’s queen with a skewer.

A lesson: notice the astonishing power of the queen in an open position. Its ability to run the length of the board in one move, and to attack from different angles, enables it to give surprising checks with devastating results and makes it especially formidable late in the game. Once many of the pieces cleared off the board, you also are more likely to find an enemy target that is loose, which is important when you are using the queen as a skewering tool; only loose targets will do, because the queen usually is too valuable to trade away.