White sends his Queen to a5, which prevents Black's King from escaping anywhere below the 6th Rank, which it's currently on ... Black responds by moving the King to d6.
White begins a series of diagonal moves for his King, first to c2 ... Black's King returns to e6.
White's King advances diagonally, to d3 ... Black's King goes back to d6.
White's King now goes diagonally, up to e4 ... Black, again, returns his King to e7.
White puts his Queen onto b6, which "Checks" (+) Black's King, which must move upward ... Black's King escapes Check, to e7.
So, in that 5th Move, not only does Black have to move the King, but, while White's Queen occupies all of the 6th Rank, it can now no longer move below the 7th Rank.
White returns to focus on his King, which is moved up to e5 ... Black's King moves away, to f7.
White's King moves across to f5 ... Black's King moves in the opposite direction, to e7.
White now puts his Queen up onto the 7th Rank, at c7, which again "Checks" (+) Black's King, forcing another move upwards and away from the threat ... Black's King goes to f8, but it's now greatly restricted, with only a handful of safe squares to choose, on the 8th Rank.
White advances his King to f6 ... Black's King goes to e8, which turns out to be his last legal move of the game, as on.
White's Queen goes onto e7, "Checkmate" (#).
White Wins (1-0).
- Qa5 ... Kd6
- Kc2 ... Ke6
- Kd3 ... Kd6
- Ke4 ... Ke6
- Qb6+ ... Ke7
- Ke5 ... Kf7
- Kf5 ... Ke7
- Qc7+ ... Kf8
- Kf6 ... Ke8