Riichi Mahjong Calculator

Riichi Mahjong Calculator is an open-source Android application for analyzing riichi mahjong hands. It combines hand efficiency, meld hand efficiency, winning hand analysis, and score calculation in one tool. It is suited to people who study riichi mahjong or want to examine decisions and results while using an Android device.

The hand efficiency functions cover tile efficiency and backwards strategy. They also provide good-shape tile efficiency for hands that are one-shanten. These functions focus on evaluating tile choices and hand development without adding features beyond the listed analysis types.

Meld hand efficiency covers tile efficiency for chow, pung, kong, and pass decisions. It includes good-shape tile efficiency for one-shanten hands and also supports backwards strategy. Winning hand analysis uses Mahjong Soul and Tenhou rules by default, with some options for customizing those rules. Score calculation is based on fan and minipoints, using the same default rules and limited customization approach.

The application is listed in MirrorNest's Education category because its functions support the study and examination of riichi mahjong hands. Its Android platform makes it a mobile tool for users working with these calculations on compatible devices. MirrorNest stores a direct mirror of the official build and scans it for malware before publishing it.