The Mock Turtle

I can’t do it. Ignore the E and F lines.

I think this is it.

But you have four pieces in a column that says three.

ETA and two in the last column that says three

Oh, I thought it was just the rows, I’d lost that bit in the screen grab Scrub that.

ETA obv it’s in the actual screen grab but I have my screen landscape at the moment.

I think I’ve got it this time. Not promising though

I think this works (red line).

Oh! I think Tex and I have come up with the same answer. I hope we are right!

OMG thank you! I just couldn’t get it.

I couldn't do it in a linear fashion; I had to put blobs on the fixed points, count them and add xs to squares that couldn't hold a piece of track until I'd narrowed the possibilities down.