(;GM[1]FF[4]SZ[19]
GN[Interesting [exchange\]? (IV)]
PC[http://senseis.xmp.net/?TesujiTheBook/Discussion]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?TesujiTheBook/Discussion

Interesting [exchange\]? (IV)]
PL[B]

AB[mp][np][op][pp][qp][lq][qq][rq][lr][pr][ns]
AW[qo][kp][lp][jq][mq][oq][pq][mr][nr][or]
CR[nr][ns]

;B[ls]C[B1]MN[1]
;W[qr]C[W2]MN[2]
;B[os]C[B3]MN[3]
;W[ps]C[W4]MN[4]
;B[ms]C[B5]MN[5]

;CR[nr][ns]
)
