Toy Vault Inc.
The Line-of-Sight rules for Ranged Combat start on R-11. Ranged Combat comes in two forms: a) Line-of-Sight (LOS) and b) Indirect Fire.
Line-of-Sight Ranged Combat has a range of 5 "grid sectors" (squares) and "up, down, across, or diagonally" (orthogonally and diagonally ONLY). Like the move of the Queen in Chess—out to 5 squares!
The Red Recon Link is on space within five squares of the Blue Heavy Link, but does not sit on a space that can be drawn to it by a strictly diagonal or orthogonal line from the Heavy. (This is a bit like the way LOS is drawn in Star Wars: Epic Duels. Another game I really enjoy.) Note that LOS is blocked to the Red Heavy Link adjacent to Red Infantry in the upper left corner of the map for the same reason.
Note: I haven't even played the game yet, so I don't know why direct-fire line-of-sight is done this way. My guess is that it encourages people to think about unit positioning in the game. It makes it more difficult to stay in one place and pour fire directly into whatever enemies may be close to you. It may also give Infantry units a chance to approach targets with long-range fire capabilities without being targets themselves. This would force the enemy to vacate a position if they want to engage a close-by enemy unit.
Correct, The LOS is restrictive to add a level of tactics to the game.