(;
AB[dd][ce][gc]
AW[ec][ic]
TR[ec]
C[Black's response to the marked invasion probe?

Source:
    Practical Tactics and Tesuji, Rin Kaiho 9p
    Go World, Vol. 2, p. 50]
(;
B[fd]
C[Trying to capture the stone is a mistake.];
W[cc];B[dc];W[db];B[ed];W[fb]
C[White lives in the corner, and Black's outer influence is usually not enough compensation for the corner loss.]
)
    (;
    B[ed]
    TR[ce]
    LB[cd:A]
    C[This reaction to White's probe is also a mistake.  Note that if the marked stone was at A, then Black's move here would be OK.];
    W[fc];B[gd];W[gb];B[hb];W[fb];B[hc];W[cc]
    C[Again, White's corner life causes major damage, and Black's wall is not perfect.]
    )
    (;
    B[dc]
    C[Correct response to White's light probe.]
    (;
    W[db]
    C[White is more likely to respond here.];
    B[cb];W[ed];B[ee];W[fe]
    (;
    B[ef]
    C[The simplest reply.];
    W[gd];B[eb];W[fb];B[da];W[fc]
    C[White captures a stone, but Black's result, including having sente, is more than adequate.]
    )
        (;
        B[fd]
        C[A tempting cut. but ...];
        W[ef]
        C[... being slapped down with this atari is annoying.];
        B[de];W[ge];B[eb]
        C[Black captures some stones, but White ends with sente.]
        )
    )
        (;
        W[ed]
        C[A mistake.];
        B[ee];W[fd]
        C[White has to make bad shape.];
        B[hd]
        C[Black can answer directly here, but White is at such a disadvantage, that Black might even tenuki.]
        )
    )
)

