(;GM[1]FF[4]SZ[19]
GN[The pattern emerges... read the rest of the way!]
PC[http://senseis.xmp.net/?LongestLadderProblem/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?LongestLadderProblem/Solution

The pattern emerges... read the rest of the way!]
PL[W]

AB[aa][ba][ca][da][ea][fa][ga][ha][ia][ja][ka][la][ma][na][oa][pa][qa][ra][sa][ab][sb][ac][cc][dc][ec][fc][gc][hc][ic][jc][kc][lc][mc][nc][oc][pc][qc][sc][ad][cd][qd][sd][ae][ce][fe][ge][je][ke][qe][se][af][cf][of][qf][sf][ag][cg][og][qg][sg][ah][ch][kh][qh][sh][ai][ci][ki][qi][si][aj][cj][oj][qj][sj][ak][ck][lk][mk][ok][qk][sk][al][cl][ql][sl][am][cm][km][mm][qm][sm][an][bn][cn][kn][qn][sn][eo][ho][io][mo][no][qo][so][ap][bp][cp][ep][qp][sp][cq][hq][iq][jq][kq][lq][mq][nq][oq][pq][qq][sq][cr][sr][cs][ds][es][fs][gs][hs][is][js][ks][ls][ms][ns][os][ps][qs][rs][ss]
AW[bb][cb][db][eb][fb][gb][hb][ib][jb][kb][lb][mb][nb][ob][pb][qb][rb][bc][rc][bd][dd][ed][fd][gd][hd][id][jd][kd][ld][md][nd][od][pd][rd][be][de][pe][re][bf][df][pf][rf][bg][dg][pg][rg][bh][dh][ph][rh][bi][di][pi][ri][bj][dj][pj][rj][bk][dk][pk][rk][bl][dl][pl][rl][bm][dm][pm][rm][dn][pn][rn][ao][bo][co][do][po][ro][dp][ip][jp][kp][lp][mp][np][op][pp][rp][aq][bq][dq][rq][br][dr][er][fr][gr][hr][ir][jr][kr][lr][mr][nr][or][pr][qr][rr][bs]
LB[fo:a]

;W[hp]C[W1]MN[1]
;B[gq]C[B2]MN[2]
;W[gp]C[W3]MN[3]
;B[fq]C[B4]MN[4]
;W[fp]C[W5]MN[5]
;B[eq]C[B6]MN[6]

;LB[fo:a]
)
