# Quizzman I-Ching — About (Gieo quẻ Kinh Dịch online)

- HTML: https://lab.quizzman.com/tool/about-iching
- Tool: https://lab.quizzman.com/tool/iching-divination
- Canonical language: Vietnamese (`lang=vi`); also EN/ZH/ZHT/JP/KR

## Definition

**Gieo quẻ Kinh Dịch online** with **Quizzman I-Ching** means the browser only sends the question and casting method; the **server** simulates real casting (not table lookup only), then explains results using Classical (十翼), Six Lines / Lục Hào (六爻), and Plum Blossom / Mai Hoa (梅花易数).

## How to cast

1. Open https://lab.quizzman.com/tool/iching-divination  
2. Enter a question and pick one of five methods  
3. Submit → **I-Ching Engine on the server** casts and interprets  
4. The client only displays the result (no client-side RNG for casting)

## Functions

1. Five casting methods: Three Coins, Yarrow (Daiyan 18 steps), Plum Blossom by time, Plum Blossom by numbers, manual six lines
2. Changing lines (6/9) → changed hexagram; nuclear hexagram
3. Parallel school interpreters + balanced mode
4. Full 64×6 texts (Kanripo Classical Chinese + Wilhelm/Baynes + Vietnamese)
5. Can Chi / True Solar Time from **Quizzman Calendar** core (UTC+7)
6. True/False Void (Không Vong) classification
7. Light NLP for question domain advice
8. Shareable server-side snapshot (`?hash=`)

## Algorithms

- **RNG (server only):** CSPRNG via Python `secrets` / `os.urandom` — **not** browser Web Crypto (`crypto.getRandomValues`), **not** `Math.random`
- **Coins:** binomial n=3 → P(6)=P(9)=1/8, P(7)=P(8)=3/8 (`secrets.choice([2, 3])` × 3)
- **Yarrow:** 18-step Great Expansion; yin-biased P(6)=6.25%, P(9)=18.75% (`secrets.randbelow` for stalk splits)
- **Plum Blossom:** deterministic modular hash of stems/branches or user numbers (no CSPRNG)
- **Interpretation:** Zhu Xi changing-line rules + Lục Thần / Thể–Dụng layers

## Accuracy meaning

1. Casting probabilities match classical models  
2. Scripture text from audited canon (Kanripo KR1a0001) — not LLM-generated  
3. Time pillars synchronized with Quizzman Calendar  

Does **not** claim real-world fortune correctness.

## Terms of use (Science Lab)

- https://lab.quizzman.com/tool/about-terms
- https://wiki.quizzman.com/wiki/loi-canh-tinh-danh-cho-nguoi-dung-quizzman-tinh-than-kalama-va-lan-ranh-giua-tham-khao-voi-me-tin
- https://wiki.quizzman.com/wiki/tu-luc-va-hanh-dong-moi-la-yeu-to-quyet-dinh-so-phan

## Related wiki

- https://wiki.quizzman.com/wiki/quizzman-iching-lich-phap-thuat-toan-do-chinh-xac
- https://wiki.quizzman.com/wiki/quizzman-i-ching-engine
- https://wiki.quizzman.com/wiki/gieo-que-kinh-dich-5-phuong-phap-luc-hao-mai-hoa-co-thi
- https://wiki.quizzman.com/wiki/thuat-toan-mo-phong-gieo-que-kinh-dich-csprng-markov-chain
- https://wiki.quizzman.com/wiki/dai-dien-phap-la-gi-thuat-toan-boi-kinh-dich-co-dai-50-thanh-thi
- https://wiki.quizzman.com/wiki/64-que-kinh-dich-he-thong-bat-quai-va-triet-hoc-am-duong
- https://wiki.quizzman.com/wiki/csprng-la-gi-lich-su-thuat-toan-ung-dung-sinh-so-ngau-nhien-mat-ma
- https://wiki.quizzman.com/wiki/can-chi-he-thong-dem-60-chu-ky-3000-nam-lich-su
- https://wiki.quizzman.com/wiki/gioi-thieu-cong-cu-quizzman-kinh-dich-lich-phap-tu-vi-bat-tu-jck-font

## Related Lab pages

- Calendar about: https://lab.quizzman.com/tool/about-calendar
- BaZi: https://lab.quizzman.com/tool/about-bazi
- Tử Vi: https://lab.quizzman.com/tool/about-tuvi
- Lab llms.txt: https://lab.quizzman.com/llms.txt