(;GM[1]FF[4]SZ[19]
GN[Just before]
PC[http://senseis.xmp.net/?RetrogradeAnalysisProblem3/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?RetrogradeAnalysisProblem3/Attempts

Just before]
PL[B]

AB[lo][mo][no][po][ro][kp][np][nq][kr][nr][pr][qr][rr][os][ps][qs][rs]
AW[mp][mq][oq][pq][qq][rq][sq][mr][or][sr][ms][ss]
CR[pr][qr][rr][os][ps][qs][rs]

;W[ns]C[W4]MN[4]

;CR[pr][qr][rr][os][ps][qs][rs]
)
