7x7 - Cube Solver

Unlike a 3x3, you solve all six centers first. Strategy:

Suppose you have a 7x7 cube with a random scramble. Your goal is to create a white cross on the top surface. 7x7 cube solver

We use the “chain pairing” method:

Algorithm (simplified):

for each edge_group in [UF, UL, UB, UR, FL, BL, BR, FR, DF, DL, DB, DR]:
    # Step 1: get first two pieces matching
    while edge_group[0] != edge_group[1]:
        find matching pair in E slice
        bring to working location
        apply pairing move (e.g., R U R' U')
    # Step 2: add third piece
    while edge_group[2] != edge_group[0]:
        locate third piece
        insert using slice-flip-slice (e.g., 2R U2 2R')
    # Step 3: move solved edge to U/D face