(;SZ[4]AB[ad]AB[bd]AB[cd]AB[dd]AW[ac]AW[ab]AW[aa]AW[db]AW[da]AW[ba]AW[ca]C[FORCE]AP[goproblems]
(;B[bb]C[FORCE];W[bc])
(;B[bc]C[FORCE]
(;W[bb]C[FORCE]
(;B[cb]C[FORCE];W[cc])
(;B[cc]C[RIGHT])
(;B[dc]C[FORCE];W[cc]))
(;W[cc]C[FORCE]
(;B[bb]C[RIGHT])
(;B[cb]C[FORCE];W[bb])
(;B[dc]C[FORCE];W[bb]))
(;W[dc]C[FORCE]
(;B[bb]C[RIGHT])
(;B[cb]C[RIGHT])
(;B[cc]C[RIGHT])))
(;B[cb]C[FORCE];W[cc])
(;B[cc]C[FORCE]
(;W[bc]C[FORCE]
(;B[bb]C[FORCE];W[cb])
(;B[cb]C[RIGHT])
(;B[dc]))
(;W[cb]C[FORCE]
(;B[bb]C[FORCE];W[bc])
(;B[bc]C[RIGHT])
(;B[dc]))
(;W[dc]C[FORCE]
(;B[bc]C[RIGHT])
(;B[bb]C[RIGHT])
(;B[cb]C[RIGHT])))
(;B[dc]C[FORCE]
(;W[bc])
(;W[cc])))