The pinch technique involves playing two notes together, using the thumb and one of the three fingers. In fingerpicking pattern 13 the p and a fingers are used together.
Pattern 13
G
The following example introduces a new way of playing the G chord. The cross indicates a deadened string, i.e., the 5th string is deadened, using the 2nd finger.
This chord shape is used for ease of playing in the following progression, which also introduces two new chords, G major 7 and G6.
Gmaj7
G6
Pattern Thirteen