Updating the pattern, December 19, 2021.

Complete update according to my new standard.
New, more convenient charts, added the written pattern for the border in the round, the foundation row for the main part, the written pattern for the square and its border in the round.
And also much more.

Table of contents at the bottom of the 5th page:
Materials list 5
Abbreviations: 6
The Blanket bottom up, row by row (including the main part) 8
The Border in the round for the Main part 60
The Square without the border 62
The Border in the round for the Square 68
Unite the Edges 69
Foundation Row for Main part of the blanket 70

I hope you enjoy working with the updated pattern

Technic: Double filet crochet / Interlocking filet crochet / Mosaic filet crochet
Type: Blanket / Afghan
Gauge: 5 boxes by 5 boxes in 5 cm
As long as your boxes are square, using a different gauge won’t affect the design, but it will change the finish size and the amount of yarn needed.

Hook size 4.5 mm. Hook size needed to match the gauge.
Approximate yardage 4000 meters of yarn for each of your two colors, which is a total of 8000 meters of yarn. (4375 yards per colors, a total of 8750 yards of yarn). (18-19 skeins (3.5 oz) for each colors)

Size: app. 150 cm wide and 210 cm long (150 x 210 windows)

The pattern contains a graph and Right-Handed instructions.

Description for the whole blanket. But you can also crochet square separately. Main interlocking pattern works evenly over a multiple of 44 + 1 A-colored boxes.