Editing Pure mate (section)

===Non-examples===
In the first non-example shown, White can play 1.Re8#. If this move is played, Black will be mated by double check. The position might be a pure mate, except that a8 is attacked twice, by both the white rook and bishop. Even if the resulting position were not a double check, Black has no way of addressing either or both attacks. In other words, it was not necessary to play the double check in order to prevent Black from capturing an attacker or interposing into a line of attack. Therefore, the double check would represent additional and unnecessary attacking force, above the minimum required for mate and contrary to the concept of economy of force. Thus, the position following 1.Re8# fails to satisfy Hooper and Whyld's definition of a pure mate.{{sfn|Hooper & Whyld|pp=326-327}} White could instead play 1.Qc8#, a genuine pure mate delivered by an unassisted queen.

In the second non-example, White can play 1.Bd5#. If this move is played, Black will be mated in a position involving a pinned piece in the king's field. The position might be a pure mate, except that a7 is both occupied by a friendly pawn and also attacked by the white queen. The pin is unnecessary to the checkmate, because even if the pawn were not pinned, it would still not be able to capture the attacking bishop or to interpose in the bishop's line of attack. If, after 1.Bd5#, the white queen were removed from the board, the position would still be a checkmate. Therefore, the pin represents additional and unnecessary attacking force, above the minimum required for mate and contrary to the concept of economy of force. Thus, the position fails to satisfy Hooper and Whyld's definition of a pure mate.{{sfn|Hooper & Whyld|pp=326-327}} White could instead play 1.Qd5#, simultaneously unpinning the black pawn and delivering a genuine pure mate.

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{|
|-valign="top"
|{{Chess diagram
|tleft
| Non-example 1
|kd|  |  |  |  |  |  |
|pd|  |  |  |  |  |  |
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|  |  |  |  |rl|  |  |
|  |  |  |  |  |bl|  |
|  |  |  |  |  |kl|  |
|  |  |ql|  |  |  |  |
| The position following 1.Re8# is not accepted as pure mate, because the double check involves superfluous attacking force. Instead, 1.Qc8# would be a pure mate.
}}
|{{Chess diagram
|tright
| Non-example 2 
|kd|bd|  |  |  |  |  |
|pd|  |  |  |  |bl|  |
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|  |  |  |  |  |  |  |
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|  |  |  |  |  |  |  |
|ql|  |  |  |  |kl|  |
|  |  |  |  |  |  |  |
| The position following 1.Bd5# is not accepted as pure mate, because there is no need to keep the pawn pinned to a7 in order to checkmate.  Instead, 1.Qd5# unpins the pawn and delivers a pure mate.
}}
|}
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{{clear}}