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