(;SZ[4]TR[cc]TR[bc]TR[bb]TR[cb]AB[da]AW[aa]AW[ad]C[please think the marked points are not on this board. rules are chinese. and no komi.FORCE]AP[goproblems]
(;B[ac]TR[cc]TR[bc]TR[bb]TR[cb]AW[bc]LB[ab:a]C[FORCE];W[ab]TR[bc]TR[bb]TR[cb]TR[cc]LB[dd:a]C[FORCE];B[dd]TR[cc]TR[bc]TR[bb]TR[cb]C[white wins.])
(;B[ab]TR[cc]TR[bc]TR[bb]TR[cb]AW[bb]LB[ac:a]C[FORCE];W[ac]TR[cc]TR[bc]TR[bb]TR[cb]LB[dd:a]C[FORCE];B[dd]TR[cc]TR[bc]TR[bb]TR[cb]C[white wins.])
(;B[ca]TR[cc]TR[bc]TR[bb]TR[cb]LB[dd:a]C[FORCE];W[dd]TR[cc]TR[bc]TR[bb]TR[cb]LB[db:a]C[FORCE];B[db]TR[cc]TR[bc]TR[bb]TR[cb]C[white wins.])
(;B[db]TR[cc]TR[bc]TR[bb]TR[cb]LB[dd:a]C[FORCE];W[dd]TR[cc]TR[bc]TR[bb]TR[cb]LB[ca:a]C[FORCE];B[ca]TR[cc]TR[bc]TR[cb]TR[bb]C[white wins.])
(;B[dc]TR[cc]TR[bc]TR[bb]TR[cb]LB[cd:a]C[FORCE];W[cd]TR[cc]TR[bc]TR[bb]TR[cb]LB[ca:a]C[FORCE];B[ca]TR[cc]TR[bc]TR[bb]TR[cb]C[white wins.])
(;B[dd]TR[cc]TR[bc]TR[bb]TR[cb]LB[ba:a]LB[bd:b]C[FORCE]
(;W[ba]TR[cc]TR[bc]TR[bb]TR[cb]LB[ca:a]LB[db:b]LB[dc:c]LB[cd:d]AW[ba]C[FORCE]
(;B[ca]TR[cc]TR[bc]TR[bb]TR[cb]AW[cb]LB[db:a]C[FORCE];W[db]TR[cc]TR[bc]TR[bb]TR[cb]C[white wins.])
(;B[db]TR[cc]TR[bc]TR[bb]TR[cb]LB[bd:a]C[FORCE];W[bd]TR[cc]TR[bc]TR[bb]TR[cb]C[white wins.])
(;B[dc]TR[cc]TR[bc]TR[bb]TR[cb]LB[bd:a]C[FORCE];W[bd]TR[cc]TR[bc]TR[bb]TR[cb]C[white wins.])
(;B[cd]TR[cc]TR[bc]TR[bb]TR[cb]C[tie is the best in this case.RIGHT])
(;B[ba]AW[ba]TR[cc]TR[bc]TR[bb]TR[cb]LB[bd:a]C[FORCE];W[bd]TR[cc]TR[bc]TR[bb]TR[cb]C[white wins.]))
(;W[bd]TR[cc]TR[bc]TR[bb]TR[cb]LB[cd:a]LB[dc:b]LB[db:c]LB[ca:d]AW[bd]C[FORCE]
(;B[ca]TR[cc]TR[bc]TR[bb]TR[cb]C[tie is the best in this case.RIGHT])
(;B[db]TR[cc]TR[bc]TR[bb]TR[cb]LB[ba:a]C[FORCE];W[ba]TR[cc]TR[bc]TR[bb]TR[cb]C[white wins.])
(;B[dc]TR[cc]TR[bc]TR[bb]TR[cb]LB[ba:a]C[FORCE];W[ba]TR[cc]TR[bc]TR[bb]TR[cb]C[white wins.])
(;B[cd]TR[cc]TR[bc]TR[bb]TR[cb]AW[cc]LB[dc:a]C[FORCE];W[dc]TR[cc]TR[bc]TR[bb]TR[cb]C[white wins.])
(;B[bd]TR[cc]TR[bc]TR[bb]TR[cb]AW[bd]LB[ba:a]C[FORCE];W[ba]TR[cc]TR[bc]TR[bb]TR[cb]C[white wins.])))
(;B[cd]TR[cc]TR[bc]TR[bb]TR[cb]LB[dc:a]C[FORCE];W[dc]TR[cc]TR[bc]TR[bb]TR[cb]LB[ca:a]C[FORCE];B[ca]TR[cc]TR[bc]TR[bb]TR[cb]C[white wins.]))