EarthBound Beginnings (Nathan-R-Og/mother)

In EarthBound Beginnings (the English build that the 2015 Virtual Console release uses), a shared routine adds random spread to a value: it moves the value by a weight in percent drawn from a 128-entry table by a random byte, up or down at even odds. The weights run from 0 to 24, and 92 of the 128 entries are 10 or less, so most rolls move the value by a few percent. Damage and the turn-order Speed roll both use it. mother1/spread

About: EarthBound Beginnings Damage formula

{
 "weights": {
  "0": 5,
  "1": 10,
  "2": 10,
  "3": 10,
  "4": 10,
  "5": 9,
  "6": 9,
  "7": 8,
  "8": 8,
  "9": 7,
  "10": 6,
  "11": 6,
  "12": 5,
  "13": 4,
  "14": 4,
  "15": 3,
  "16": 3,
  "17": 2,
  "18": 2,
  "19": 2,
  "20": 1,
  "21": 1,
  "22": 1,
  "23": 1,
  "24": 1
 },
 "of": 128,
 "unit": "percent"
}

Cited by: Damage formula, EarthBound Beginnings

In EarthBound Beginnings (English build), a normal attack deals the attacker's Offense less half the target's Defense; when the Offense is below the Defense it deals (3 × Offense − Defense) ÷ 4 instead, at least 1. The damage routine then applies the ±0–24% spread, halves the result for a shielded or guarding target, and deals at least 1. mother1/bash-damage

About: EarthBound Beginnings Damage formula

{
 "defenseDivisor": 2,
 "weakFormula": "(3*off - def) / 4",
 "spreadMaxPercent": 24,
 "minimum": 1
}

Cited by: Damage formula, EarthBound Beginnings

In EarthBound Beginnings (English build), a plain attack is a "SMAAAASH!!" when a random byte is below max(0, ⌊(256 + attacker's Fight − target's Fight) ÷ 2⌋ − 102), about 26 in 256 at equal Fight. It is checked before the dodge roll, so it can't be dodged, and it deals the attacker's Offense, ignoring Defense. There is no SMAAAASH during the invincibility scripts, while the party fires the tank gun instead, or, 1 time in 2, from a blinded attacker. mother1/smaaaash

About: EarthBound Beginnings Critical hit

{
 "offset": 102,
 "of": 256,
 "atEqualFight": 26,
 "damage": "offense"
}

Cited by: Critical hit, EarthBound Beginnings

In EarthBound Beginnings (English build), the target of a plain attack dodges when a random byte is at most max(0, ⌊(256 + target's Fight − attacker's Fight) ÷ 2⌋ − 102), 27 in 256 at equal Fight; a paralyzed, sleeping, or petrified target can't dodge. The attacker has no accuracy stat of its own. mother1/dodge

About: EarthBound Beginnings Hit chance

{
 "offset": 102,
 "of": 256,
 "atEqualFight": 27
}

Cited by: EarthBound Beginnings, Hit chance

In EarthBound Beginnings (English build), the next combatant to act is picked one at a time: every combatant yet to act this round rolls its Speed through the ±0–24% spread, capped at 255, and the highest goes; the rest roll again for the next pick. mother1/turn-order

About: EarthBound Beginnings Turn order

{
 "spreadMaxPercent": 24,
 "cap": 255,
 "rerollEachPick": true
}

Cited by: EarthBound Beginnings, Turn order

In EarthBound Beginnings (English build), running away works 1 time in 2 (the top bit of a random byte), with no stat in it, and never in a battle an event started. mother1/run

About: EarthBound Beginnings Fleeing

{
 "chance": 0.5
}

Cited by: EarthBound Beginnings, Fleeing

In EarthBound Beginnings (English build), each step in an area with encounters starts a fight when a random byte is below a rate from the table 32, 21, 16, 13, 10, 8, 6, 5 (in 256), indexed by the area's frequency class (1–7) plus a counter, capped at the eighth entry. The counter rises by 1 with each encounter, up to 2, so the rate drops after fights; it returns to 0 in areas without encounters and after a fade-out transition. mother1/encounter-rate

About: EarthBound Beginnings Random encounter

{
 "rates": [
  32,
  21,
  16,
  13,
  10,
  8,
  6,
  5
 ],
 "of": 256,
 "counterMax": 2
}

Cited by: EarthBound Beginnings, Random encounter, Visible encounter

In EarthBound Beginnings (English build), damage comes off the target's HP in one subtraction, and the target falls when it reaches 0 or below: there is no rolling meter. mother1/hp-at-once

About: EarthBound Beginnings Rolling HP meter

Cited by: EarthBound Beginnings, Rolling HP meter