If you want to randomly choose a match up, then you can use the table below. This is the table used in the Internet Up Front League. Role a six-sided dice twice (or a third time if needed) and consult the results below.
Step 1: Determine Nationalities (three 6-sided dice)
Step 2: Determine Scenario
Randomly determine scenario from those available to both nationalities.
Step 3: Night Rules?
1 in 10 chance of night rules in any scenario.
Step 4: Desert Rules
1 in 6 chance of desert rules unless either player is Russian or Japanese.
Percentages of scenarios that will involve each nationality: