Android Netrunner Comprehensive Unofficial Rules Wiki
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Page 31, Column 3, Paragraph(s) 5, Core Rule Book
Strength: An attribute of programs and ice.

Strength is a number located on the bottom left corner of ice and program cards. Strength is what allows icebreakers to interact with ice; abilities on an icebreaker that affect ice cannot be used unless that icebreaker's strength is greater than or equal to the strength of the ice.

Negative Strength[]

Strength can go below zero.

Page 4, Column 2, Paragraph(s) 10, FAQ
Ice and icebreakers can have negative strength.
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