c1 locked: false
c2 locked: false
c3 locked: true
c1 should be locked: true
c3 should not be locked: false
c2 value should be 7: 7
c3 value should be 8: 8
c1 value should be 5: 5
c1 row, col (0, 0): 0, 0
c2 row, col (1, 5): 1, 5
c3 row, col (2, 6): 2, 6
c3: position: 2, 6 value: 8 locked: false
c4: position: 2, 6 value: 8 locked: false
c3: position: 2, 6 value: 8 locked: false
c4: position: 2, 6 value: 3 locked: true