Fog of war

When the Fog of war (FoW) optional rule is enabled, a player can only see the units and events that are near his borders or units.

On game
This is the information that each player can see, depending on the location:

Only in the areas adjacent to his own areas or units:
 * Military units
 * Unit conversion events
 * Unit disband events
 * Expense events
 * Movements and retreats only when destination area is adjacent.
 * Events related with military units.
 * Standoff events.

Everywhere in the board:
 * Disabled areas
 * Special incomes
 * Control markers
 * Disaster markers
 * All events but those listed above

Diplomats
When FoW is used, a new type of expense is available (only if finances are too enabled): hiring a "diplomat".

A diplomat is placed in the board when expenses are processed, and they are visible only in its owner's map. A diplomat allows the player to see its own area and all the adjacent areas. Once placed, a diplomat cannot be moved.

The cost of a diplomat is 1 ducat if it's placed in an area controlled by the player who hires the diplomat, and 3 ducats if it's placed in any other area.

A diplomat can be uncovered at the end of Fall, after the map is generated. Every Fall, a diplomat in an enemy controlled area has a probability of 1/2 of being uncovered. This probability is 1/3 if the area is not controlled by anyone, and 0 if the area is controlled by the diplomat's owner.

When a diplomat is uncovered, an event is shown to all the players in the game.