(;GM[1]FF[4]SZ[19]AP[SmartGo:0.4.1.2]CA[UTF-8]
GN[167dx]
PB[Black to play]
RU[Japanese]ST[2]
AB[lo:ro][lp][rp][mq][qq]
AW[om][qm][rn:sn][so:sq][mp:qp][iq][kq:lq][rq]
C[Often the diagonal move helps a stone both attack and increase its own liberties. But there are two stones that
need a diagonal move playing and the other one gets captured.]
(;B[pr];W[nq];B[mr];W[nr])
(;B[nr];W[pq];B[qr];W[pr])
(;B[pq]
C[Similarly both pushes fail.];W[nq];B[mr];W[nr])
(;B[or]
C[In this position it is the double knight's move, which is
at the centre of symmetry that works. This is the correct move.]
(;W[nq];B[mr]
(;W[qr];B[pq];W[nr];B[ns])
(;W[pq];B[qr];W[pr];B[ps];W[rr];B[qs];W[rs];B[os];W[nr];B[ns])
(;W[nr];B[ns];W[lr];B[ms];W[ls];B[os]
(;W[pq];B[qr])
(;W[pr];B[pq])))
(;W[pq];B[qr]
(;W[nq];B[mr];W[nr];B[ns];W[lr];B[ms];W[ls];B[os];W[pr];B[ps])
(;W[mr];B[nq]))
(;W[pr];B[pq]
(;W[nq];B[mr];W[qr];B[oq])
(;W[oq];B[nq])))
(;B[nq];W[pq];B[qr];W[pr]))

