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-Hitting your target, parrying, critical hits, double hits, and elemental status
-are controlled by random chance. On the one hand, this adds depth through
-management of risks and rewards, and it forces unexpected events on the players.
-On the other hand, it can quickly make combats feel unfair (e.g. good tactics
-failing due to bad luck) or infuriate players (e.g. missing a 95% chance shot in
-XCOM).
-
-To mitigate the drawbacks, TO should balance the impact of luck.
-
-During a battle, each players has a Luck meter. Luck in between -200 and 200. It
-starts at 0.
-
-When a player makes a roll with X% chance, the result is as follows:
-Roll = rand(100);
-IsSuccess = ((X + Luck) >= Roll);
-if (IsSuccess)
-{
- if (X > 50)
- {
- // It was likely to succeed, pay just what you used.
- MissingPoints = max(0, (Roll - X))
- Luck' = (Luck - MissingPoints)
- }
- else if (X =< 50)
- {
- // It was unlikely to succeed, pay a lot.
- Cost = (55 - X) // How far was it from being reasonable?
- Luck' = (Luck - Cost)
- }
-}
-else
-{
- // Failure due to bad roll.
- if (X >= 50)
- {
- // It was likely to succeed, you're owed a lot.
- OwedPoints = (X - 45)
- Luck' = (Luck + OwedPoints)
- }
-}
-
-For example:
-
-A/ The character of a player with 15 Luck attempts a 10% chance parry:
-if (Roll <= 25)
-{
- // Unlikely Success.
- Cost = (55 - 10) = 45
- Luck' = 15 - 45 = -30
-}
-else if (Roll > 25)
-{
- // Expected Failure.
-}
-
-B/ The character of a player with 20 Luck attempts a 45% chance parry:
-if (Roll <= 60)
-{
- // Unlikely Success.
- Cost = (55 - 45) = 10
- Luck' = 20 - 10 = 10
-}
-else if (Roll > 60)
-{
- // Expected Failure.
-}
-
-D/ The character of a player with 20 Luck attempts a 55% chance parry:
-if (Roll <= 70)
-{
- // Likely Success.
- UsedUpLuck = max(0, (55 - Roll)) = [0, 20]
- Luck' = 20 - UsedUpLuck = [0, 20]
-}
-else if (Roll > 70)
-{
- // Unlucky dice roll.
- OwedPoints = (55 - 45) = 10
- Luck' = 20 + 10 = 30
-}
-
-D/ The character of a player with -35 Luck attempts a 15% chance parry:
-No roll required. This fails. No luck update.
-
-E/ The character of a player with -35 Luck attempts a 75% chance parry:
-if (Roll <= 40)
-{
- // Without the negative luck, it was likely to succeed
- // Luck clearly didn't help, so none is to be payed.
-}
-else if (Roll > 40)
-{
- // If not for that negative luck, you were likely to make it.
- // You're owed some luck back.
- OwedPoints = (75 - 45) = 30
- Luck' = -35 + 30 = -5
-}