Use Color A
Chain 2
Row 1: Make one single stitch (S St) in 2 chain from hook.

Row 2: Make three S St in one stitch.

Color B
Row 3: Make two S St in the first St, make one st, Make two S St in the last st.

Row 4: Make two S St in the first St, make one st across, Make two S St in the last st.

Change color every two rows.

Repeat Row 4 until the desired size. It should look like a triangle. To determine the size of the final blanket measure along the edge (see: photo)

Once the desired size is reached:

Crochet two S St together in the first St, make one st across, Crochet two S St together last st.

In the last row there should be three st. Crochet all three st together.