(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[White]PB[Black]AW[mb][nb][pc][qc][od][qd][pe][qf]AB[lb][pb][qb][lc][mc]C[Black to live in the corner.]
;B[ra]C[This is the tesuji. It threatens to live in the corner. I spotted this within 5-10 sec of looking at the problem.]
;W[rc]C[Naturally white blocks]
;B[nc]
;W[ob]
;B[oc]
(;W[rb]C[But if white goes here]
;B[oa]C[black hanes to capture the 3 stones. This is the main variation provided in the book, and I was able to read this out successfully.])
(;W[oa]C[This is the other variation that comes to mind.]
;B[rb]C[Black has to connect here to increase his liberties.]
;W[pa]C[White now goes here to prevent black from getting an eye.

Now, can you spot black's next move?]
(;B[sb]
;W[ma]
;B[la]
;W[sc]C[This is the correct variation. Black lives in a seki and gets sente - so it's a great result. However, I missed this.])
(;B[ma]C[I instinctively haned, thinking that black can win the capturing race. ]
;W[sb]
;B[la]
;W[sc]
;B[na]C[And he rightfully does.]
;W[sa]C[However, ]
;B[qa]
;W[ob]C[white revives through the under the stone tesuji. These are the kind of lines I've been missing while solving these problems. Very tricky indeed.])))