Page 31, Column 3, Paragraph(s) 11, Core Rule Book
Trace Strength: The Corporation's total strength during a trace; the sum of the base strength on the card initiating the trace and the amount of credits the Corporation spends on the trace.

The Corporation's trace strength is his/her total strength as compared to the Runner's link strength during a trace attempt. To figure out his/her trace strength, the Corporation adds up the base strength listed in the effect on the card that initiated the trace and the number of credits s/he spent during the trace.

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