(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[White]PB[Black]AW[np][lq][oq][pq]AB[oo][op][qq]TR[pq]C[Black to respond to the marked stone.]
(;B[qp]C[Correct! This is good shape.])
(;B[qr]
;W[pp]C[Incorrect. Black's stones are cut.])
(;B[pp]LB[qo:C][qp:A][qr:B]C[Incorrect. This is an empty triangle, and has several weaknesses (marked).])
(;B[pr]
;W[pp]C[Incorrect. Black's stones are cut.]))

