Compromised Diagonal

Compromised Diagonal  

Black's diagonal play here is regarded as 'compromised' by the presence of the marked White stone (or, by symmetry, a white stone at any of the other marked intersections).

Eye Shape  

The point with the marked Black stone on it, or a, is good for Black's eye shape - imagine Black now at b.

The terminology is attributed to Victor Chow.

Compromised diagonal in joseki  

This is a 3-4 point, high approach, inside contact, solid connection joseki. Note how the diagonals are compromised by .

Compromised diagonal in joseki  

Here, is a common probe, leaving Black with weaknesses at a and b. As Black can choose to defend only one of them, White can then decide the follow-up moves.