A fórmula para um teste de ataque corpo-a-corpo geralmente é:
BAB + Str Mod + 1d20
Flurry of Blows faz duas alterações neste fórmula:
When doing so, he may make one additional attack, taking a –2 penalty on all of his attack rolls, as if using the Two-Weapon Fighting feat. These attacks can be any combination of unarmed strikes and attacks with a monk special weapon (he does not need to use two weapons to utilize this ability).
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For the purpose of these attacks, the monk's base attack bonus from his monk class levels is equal to his monk level.
Isso faz a fórmula de ataque:
Monk Level + Str Mod - 2 + 1d20
A mesa de classes combina o nível de Monk e a penalidade de -2 na coluna Flurry of Blows Attack Bonus. Te dando a fórmula:
Flurry of Blows Attack Bonus + Str Mod + 1d20