Wayne,

Many thanks for your answer. Saddly we cannot go between piles 1 - 2
and 2 - 3 because of other boats moored there.
We do have permanent support lines between piles 1 and 3 adn 2 and 4
as you sugessted.

PILE 1 PILE 2

O O
| \ A B / |
| \ /\ / | support line
| \ / \ / |
| \ / \/ |
| [ ] |
| [ ] |
| [ ] boat | === WIND
| [ ] |
| / [ ] \ |
| / \____/ \ |
| / C D \ _ |
O O

PILE 3 PILE 4

Saddly this solution do not help if wind is blowing from port side. In
case of single-handed sailing first helmsman have to release ropes A
and B, then walk back to release aft ropes C and D. In the meantime
wind will push bow to left and boat will end-up blocked between
support lines - it have been already tested ;-)