Studying Chuban (1)

Figure 1: Tsume from a shimari

The position in fig 1 was found 8 times in the collection of 5172 games. The position in fig 2 was found 2 times.

When the right side position is strong without exception black plays [a] in fig 1.

Figure 2: Tsume from a hoshi

In case of the weaker position in the bottom-right corner black invariably plays [a] as in fig 2.