Koblentz

No price is too great for the scalp of the enemy King.

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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "White player"]
[Black "Black player"]
[Result "*"]
[BlackElo "0"]
[FEN "8/8/8/3k4/8/8/8/Q6K w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]

{ The King and Queen Checkmate.|First, white must drive his opponent's king to
the side of the board.|Any of a number of moves will win in this line, but
these seem most to the point. } 1. Qc3 { Restricting the black king's move
options. } 1... Ke4 { Black will avoid moving to the side of the board for as long
as possible. } 2. Kg2 Kd5 3. Kf3 Kd6 4. Ke4 Ke6 5. Qc6+ Ke7 6. Kf5 Kf7 7. Qb7+ Kg8 8. Kf6 Kh8 9. Qg7# *