(;AB[qq]AB[pp]AW[qp]AW[pq]AW[rp]AB[po]AB[qo]AB[ro]AW[oq]TR[qp]TR[rp]C[how should black catch these marked white stones?]AP[goproblems]
(;B[qr]C[this captures and it affects the bottom sideRIGHT])
(;B[rq]C[this captures, but it's a much slower move than R2.])
(;B[rr];W[qr];B[rq]C[white gets better shape this way than if black had played R2 to start with. white may fix now at Q1, or can leave it for later. if white leaves it and black plays Q2, this is gote, unlike in the correct solution])
(;B[sp];W[rq];B[qr];W[rr])
(;B[pr];W[qr];B[rq];W[rr];B[sp];W[or]C[white can get a good shape like this])
(;B[qs];W[qr];B[rq];W[rr])
(;B[rs];W[rq];B[qr];W[rr])
(;B[ps];W[qr];B[rq];W[rr];B[sp])
(;B[op];W[rq])
(;B[np];W[rq])
(;B[nq];W[rq])
(;B[no];W[rq])
(;B[sq];W[rq])
(;B[sr];W[rq];B[qr];W[rr];B[rs];W[pr];B[qs];W[ps]))
