Go problems

Daily problem

{"filetype":"problem","stonesize":"20","commentpos":"right","autocrop":"true"}
(;AB[bb][bc][bd][ce][de][ee][fe][gd][hd][hc][ib][jc]AW[cd][cc][cb][db][dd][fc][gc][hb]

(;B[ec];W[ed]
(;B[fb];W[gb];B[eb];W[fd]
(;B[ca];W[ea];B[fa];W[da];B[ha])
(;B[ha];W[ga];B[ca];W[da];B[ea]))
(;B[gb];W[fb];B[ha];W[ca]
(;B[ea];W[fa];B[eb];W[fd])
(;B[fa];W[ea])))
(;B[ha];W[fb];B[ec];W[ed]
(;B[ca];W[ga])
(;B[ea];W[ga])
(;B[gb];W[ca];B[ea];W[fa];B[eb];W[fd]))
(;B[gb];W[fb];B[ha];W[ec])
(;B[ca];W[ga]))

Tsumego

No. 12 Weekly problems

{"filetype":"problem","stonesize":"26",bounds:{'l':'0','t':'0','r':'11','b':'11'},"dummy":"dummy"}

(;ST[2]RU[Japanese]GM[1]PL[B]AB[ci][bi][ai][ch][cg][ag][cf][de][dd][dc]
[cb][bb][ab]AW[bh][ah][bg][bf][be][bc][ac]SZ[11]FF[4]KM[0]
(;B[af]
(;W[cd];B[ce];W[cc];B[ad];W[ae];B[bd]C[Correct, white dead])
(;W[ae];B[bd];W[cd];B[ce];W[ad];B[cc]C[Correct, white dead]))
(;B[cd];W[bd]C[Wrong, white alive ])
(;B[bd];W[cd];B[ce];W[ad];B[cc];W[af]C[Wrong, white alive in ko]))

No. 11 Weekly problems

{"filetype":"problem","stonesize":"26",bounds:{'l':'0','t':'0','r':'11','b':'11'},"dummy":"dummy"}

(;AB[cf][bf][af][ce][cd][dc][ac][db][da]AW[be]
[bd][cc][cb][ab][ca]SZ[11]FF[4]KM[0]PL[B]

(;B[aa]
(;W[bc];B[bb];W[ba];B[ab];W[ad];B[ab]C[Correct, white  dead])
(;W[ba];B[bc]C[Correct, white  dead]))
(;B[ae];W[bc];B[ad];W[ba]C[White make life])
(;B[bb];W[ba]C[Ko, not the best result]))

No. 10 Weekly problem

{"filetype":"problem","stonesize":"26",bounds:{'l':'0','t':'0','r':'11','b':'11'},"dummy":"dummy"}

(;PL[B]AB[bd][be][cf][cg][ef][ee][ed][fe][ge][he][id][ic][ib][jb][gc]
[cb]AW[gd][hd][hc][hb][gb][ec][dc][db][dd][de][ce]SZ[11]AB[bc]
(;B[fc]
(;W[fd]
(;B[da];W[ea];B[fb];W[fa];B[ha]C[Correct, White dead])
(;B[ha];W[fb]C[White alive])
(;B[fb];W[fa];B[ha];W[eb]C[Wrong, White alive]))
(;W[fb];B[ea];W[da];B[fd]C[Correct, White dead]))
(;B[da];W[ea];B[fc];W[fb];B[fd];W[ca]C[Wrong, white alive]))

No. 9 Weekly problems

{"filetype":"problem","stonesize":"26",bounds:{'l':'0','t':'0','r':'11','b':'11'},"dummy":"dummy"}

(;FF[4]ST[2]RU[Japanese]AB[bh][dh][ci][di][dg][bg][df][af][ee][be]
[ed][cd][bd][ad][ec][eb][db]AW[cg][cf][bf][de][ce][dd][dc][cc][ac][cb][bb][ch]AP[CGoban:3]
SZ[11]GM[1]KM[0]
(;B[ca]
(;W[ba];B[ab];W[aa];B[da]C[Correct, white dead])
(;W[bc];B[ba];W[ae];B[bd]C[Correct, white dead])
(;W[aa];B[da];W[bc];B[ba];W[ae];B[bd]))
(;B[bi];W[bc];B[ca];W[ba];B[ag];W[ae]C[Wrong, white alive])
(;B[ab];W[bc];B[ca];W[ae];B[ba];W[bd]))

No. 8 Weekly problem

{"filetype":"problem","stonesize":"26",bounds:{'l':'0','t':'0','r':'11','b':'11'},"dummy":"dummy"}

(;CA[Windows-1252]AB[bc][bb][eb][ea][gb][ed][de][df][cf][bf]AW[be][bd][ce][dd][cc]
[db][ca][ba][aa][ab]SZ[11]AB[ac]PL[B]

(;B[da];W[cb];B[ec];W[ad];B[bc];W[dc]C[Wrong, white alive])
(;B[ec]
(;W[cb];B[dc];W[ad];B[bc]C[Correct, white dead])
(;W[dc];B[da]C[Correct, white dead]))
(;B[ae];W[cb]C[Wrong , white alive]))

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