The obstacle must appear on both sides of the LOS string to block. An LOS that goes down a hex-spine with an obstacle touching, but not crossing, it is clear by definition.
Cliff sides do not block LOS (82.13).
One must use judgement with the SQUAD LEADER module LOS checker, apply the rule to the results of the los string.
From: Nate Forte via Squad Leader Tournament & Ladder <2012...@googlegroups.com>
Sent: Wednesday, August 9, 2023 8:18 PM
To: Squad Leader Tournament & Ladder <2012...@googlegroups.com>
Subject: [SQLA] Cliff Hex sides LOS - Blocked or Not Blocked? To be or not to be...