Please read how I used the Leeds(ish) Method and other visual aids in this recent thread.
https://www.rootschat.com/forum/index.php?topic=861869.0Unfortunately the way the Leeds Method is portrayed is that it works, where in reality it does but there are many ifs and buts.
In an ideal scenario you use 2nd - 3rd Cousins so that is about matches in the 90 to 400cM range.
In that range I have 10, of which 4 are in my tree and linked to my Mother’s side, so you would assume that the other six could be either.
Not necessarily the case!
I have a whole mass of Italian and another batch who are Irish, so somewhere there is a NPE and there is a Great Grandmother whose father is unknown.
Then there are the matches who have no trees and user names that are a jumble of letters so the only use is if there are shared matches.
You are on the right track, expand your chart with more colour coded columns. Then where you have matches that are already in your tree, highlight them as you know which parental side they are on.
Work through the chart trying to assign, using the shared matches and your known linked matches which Grandparent a match aligns with.
A way of doing this is to add four more columns to your chart and label them PGF, PGM, MGF, MGM ie one for each Grandparent. Then go down each match and assign a colour to the cell under the applicable Grandparent, leave the cell blank if you cannot assign to any ofbthem
When you have done this you can hide the other coloured cells and there is your Leeds Method Chart, completed as much as you can. It probably will have massive holes ie uncoloured cells but it is what it will be.
Off to bed now so I’ll drop by tomorrow to try and help with any queries
Hope this makes sense to you.
