(;GM[1]FF[4]SZ[19]
GN[Proofs I]
PC[http://senseis.xmp.net/?BeginnerExercise73/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise73/Solution

Proofs I]
PL[W]

AB[nq][oq][pq][qq][qr][rr][ps][rs]
AW[ro][mp][np][op][pp][qp][mq][rq][mr][sr]
SQ[ps]
LB[pr:a][os:b]

;W[or]C[W1]MN[1]
;B[nr]C[B2]MN[2]

;SQ[ps]
LB[pr:a][os:b]
)
