---
title: "The Official 110-Diagram Xiangqi Repetition Casebook · Xiangqi Master"
description: "It is the official collection of worked examples that settles how repetition positions are judged, and the reference our engine is tested against."
url: https://xiangqimaster.com/blog/what-is-the-110-diagram-casebook
updated: 2026-09-22
source: Xiangqi Master (https://xiangqimaster.com)
license: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/)
---

# What is the 110-diagram repetition casebook?

These answers restate the rules implemented by our open-source engine, which follows the WXF laws and is regression-tested against the official 110-diagram repetition casebook. Where an answer refers to a specific position, that position lives on the linked reference page, where the build verifies it against the engine before publishing.

> Direct answer
>
> It is the **official collection of worked repetition positions** used to decide how perpetual check and perpetual chase cases are ruled. The repetition laws cannot be stated compactly enough to cover every position, so the casebook supplies adjudicated examples — and it is the reference this site's engine is **regression-tested against**.

## Why a casebook rather than a rule

Because the interesting cases are combinations. One side checks while the other chases; a chased piece is protected; two pieces are chased alternately. A short rule cannot resolve these without ambiguity, so the federation published decided examples instead — the same approach a legal system takes for the same reason.

## Why it matters here

Most descriptions of xiangqi online either omit the repetition rules or state a simplified version that is wrong in the cases that actually arise. Testing an engine against the casebook is the difference between implementing the rule and implementing a summary of it.

## Related questions

Do online servers follow it?

Many implement a simplified repetition rule. This site's engine follows the casebook.

Do I need to know all 110?

No. Knowing that perpetual check loses, and that chasing is also adjudicated, covers everything a club player meets.

## Related xiangqi resources

Perpetual check and chase

Repetition is adjudicated, not automatically drawn

Editorial standards

How these answers are checked

Xiangqi rules

The complete reference, rule by rule

## Try it on a real board

Reading an answer is one thing; playing it is another. Free, instant, and nothing to install.