Taiwan rules

Charles Matthews: I presume that reference to Taiwan rules can be taken to be the SST (Ing) rules. But since this area is a minefield ... perhaps someone can explain why I'm wrong.

Bill: No, that reference is to the Taiwan rules as they existed before they adopted Ing rules. Ikeda refers to them in On the Rules of Go, Section 3.6.

Ikeda writes:

Instead of talking about filling the last neutral point, we can say with slightly greater generality that half a point is deducted from Black's score and added to White's score whenever Black makes the last competitive move. This rule, known as the Taiwan rule, is an extremely interesting modification of area rules. In formulating this rule, the key problem is how to define the last competitive move. A concise but complete definition would be highly significant; it would put the finishing touch on area rules.