Guide - Defense Techniques: Aida Yon Ken

In this post, we'll talk about an uncommon defense technique called Aida Yon Ken, which refers to four-tile gaps in an opponent's discards, and check the Houou replays to see how much weight it holds.

Analysis - Wait Win Rates by Row

Previously, we looked at the wait win rate of every riichi hand. This time, we'll look at the wait win rate of every riichi hand, separated by row.

Analysis - Sotogawa Effectiveness by Turn and Tile

We've talked about sotogawa before, but the exact effectiveness and extent wasn't really clear. Does a 4 discard create sotogawa tiles? How late can a tile come out before not counting for sotogawa? I dug into the Houou replays hoping to answer these questions.

Analysis - Wait Win Rates in Riichi Hands

I ran through 1.2 million Houou replays and checked the wait of every riichi hand, as well as whether it won or was furiten. Let's see the results!

Analysis - Tile Deal-in Rates by Live Suji

Suji counting is a good strategy for estimating the danger inherent in cutting a non-suji tile. But, how much of an effect does each dead suji have? Let's check out some data from the Houou replays.

Interesting Replays

Doing analysis on the Houou replays sometimes results in some strange discoveries. I'll add to this list whenever I find one.

Guide - Defense Techniques: Kuinobashi

Kuinobashi is a method for identifying a dangerous wait in an open opponent's hand. We'll go over the technique, as well as look at some data from the Houou replays to see if it has statistical merit.