How about loging on the tile next to the boat when you cant log in ? Dunno can you merge that with going "into" the wall but if there wouldnt be space an the tile next to the boat - it would choose other tile (random too) Only way to get stuck is blocking 3x3 and standing in the middle tile.
And could someone translate that to English not Engleshh, please? If someone know what i'm talking about.