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