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The most difficult concave curves can be made easy, making only one
score line if you are using the Morton System.

To accomplish this by using the hand breaking method and/or plier method,
you must first make a series of concentric scores. Then remove these
graduated scores in sequence. Gently tap out the primary score last.

You can also accomplish this type of cut by using the criss-cross pattern
of score lines instead of concentric scores. First you must run the scoreof the curve to avoid the criss-cross lines from running beyond the curve.

A fourth method is to score the curve, and then score a number of small crescents in the waste area, looking like fish scales or the fan type of paving seen in some European cities. Pull out each small crescent working toward the main curve.

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   cutting severe concave curves