(;SZ[4]AB[cc]AB[cb]AB[bc]AB[bb]AW[cd]AW[dc]AW[db]AB[aa]AW[bd]TR[ad]TR[ac]TR[ab]C[Please choose one from these three triangles. FORCE]AP[goproblems]
(;B[ab];W[ca])
(;B[ac]C[RIGHT])
(;B[ad]
(;W[ac]
(;B[ab]C[RIGHT])
(;B[ba]C[RIGHT])
(;B[ca]C[RIGHT])
(;B[da];W[ca]))
(;W[ca]
(;B[ba]
(;W[ab]
(;B[ac];W[ab])
(;B[da];W[ac]
(;B[ad]
(;W[ac]
(;B[ab];W[ca])
(;B[ca];W[ab])
(;B[dd];W[dc]C[RIGHT]))
(;W[ca]
(;B[ab];W[ac])
(;B[ac];W[ab])
(;B[dd]C[RIGHT])))
(;B[dd];W[dc]
(;B[ad];W[ac]C[RIGHT])
(;B[ca];W[db])
(;B[db];W[ca]))))
(;W[ac];B[da];W[ab];B[ad]
(;W[ac]
(;B[ab];W[ca])
(;B[ca];W[ab])
(;B[dd];W[dc]C[RIGHT]))
(;W[ca]
(;B[ab];W[ac])
(;B[ac];W[ab])
(;B[dd]C[RIGHT]))))
(;B[ab];W[ac])
(;B[ac];W[ba]
(;B[da];W[ca]
(;B[ab];W[ba])
(;B[ba];W[ab])
(;B[dd];W[cd]C[RIGHT]))
(;B[dd]
(;W[ab]
(;B[bd];W[cd])
(;B[cd];W[bd])
(;B[da];W[db];B[aa]C[RIGHT]))
(;W[cd]
(;B[ab];W[bd])
(;B[bd];W[ab])
(;B[da];W[ca]C[RIGHT])))))))