Alpha-bracelet conventions used by the Alpha mode of /friendship-bracelet-pattern-maker/ (T-PB.127).
RULE 1152(a): every convention the page states names its source URL and fetch date, here and beside the sentence.
All pages were fetched by public GET on 2026-10-21. Quotes are the pages' own words.

1. Base strings, knotting string, tying order
   URL: https://friendship-bracelets.net/tutorials/152
   Title: "(( Patterns )) Multi-Colored Alpha Bracelets", friendship-bracelets.net (author Stefan). Fetched 2026-10-21.
   - "Take as many base-strings as there are squares in your pattern, vertically, which usually is the smallest side of the pattern."
     -> the page's rule: base strings = the grid's width in knots + 0 (fb-alpha.js BASE_EXTRA = 0).
   - "Start the first row from left to right, making forward knots onto the base-strings."
   - "proceed with a backward knot onto the first base-string at the right-side to start the second row."
   - "Proceed like this, always all forward knots in uneven rows, and all backward knots in even rows."
     -> the page writes odd rows left to right (forward knots) and even rows right to left (backward knots).

2. How a colour change is tied
   URL: https://www.braceletbook.com/tutorials/106_how-to-make-color-switches-in-an-alpha/
   Title: "How To Make Color Switches In An Alpha", BraceletBook tutorial by arf820. Fetched 2026-10-21.
   - "You change leading strings in order to change colors in your bracelet."
   - "Remember, the base strings are strings that you knot onto with your leading string."
   - "Tape your new string behind your bracelet."
   - "Place your current leading string behind the bracelet. If you are making forward knots, place it under the bracelet and to the right."
   - "If you are making backward knots, place it under the bracelet and to the left."
   - "Simply knot your new leading string over your next base string."
     -> the page: one knotting (leading) string per colour in the grid; at a colour change the old one goes
        behind and the next colour's string ties the next knot.

3. String lengths
   URL: https://www.braceletbook.com/forum/1_newbies/3711_first-alpha-bracelet-question/
   BraceletBook forum, reply by halokiwi (moderator). Fetched 2026-10-21.
   - "The length of the bracelet + the length of the ties + some extra to be safe"
   - "Since you only make knots onto the base strings, not with the basestrings you don't need that much of them."
     -> base string = bracelet length + ties + 5 cm spare (the 5 cm is this page's choice for "some extra",
        the same spare halokiwi's normal-pattern tutorial 173 adds).
   URL: https://www.braceletbook.com/forum/1_newbies/7872_how-long-should-my-string-be-for-alpha/
   BraceletBook forum, reply by loonybin. Fetched 2026-10-21.
   - "you can assume you use about 10cm per 10 knots, or about 1cm of string per knot."
   - "then add maybe 10-15cm extra to use at the end as ties."
   - "of course how tightly you knot will change this number so i would reccomend making your own sample to measure."
     -> knotting string of a colour = its knots x 1 cm (changeable on the page) + 15 cm.