
Step 1 This is the start of the puzzle.
Solve this puzzle for yourself at the same time.


Step 2 These are the 2 possible squares for the B, as it must be in the 5th column.


Step 3 Wherever the B is, this is the only square the C can go.


Step 4 The D must now be in one of these two squares.


Step 5 And now the fun starts! The E can be in any of these squares depending on which D is correct, but at the moment we don't yet know.


Step 6 The F can now be in any one of these squares.


Step 7 The G must be on the bottom row.


Step 8 Now we know that the G is on the bottom row, we can't have the F up here, so we can actually trace this back to the B in Step 2  which we can now remove.


Step 9 We can now see that this is the only path through these squares, and this completes the bottom corner.
Note that we cannot use the B in the top section as this would leave a gap in the bottom section that could never be reached by another letter.


Step 10 The completed corner.
This technique can be continued around the rest of the grid.
There are lots of simplifications that can be made as the puzzle develops. For example on Step 6 the E couldn't be directly above the A as this is where the B would have to be.
