todbeibrot: t4q2p2s2r3 and white is alive. after t4 black should start with s2. if white answers at s1, t2 threatens r3. and if white plays r3 he doesnt have enough room to live after p2.
t2r3t4 should have a variation. now the q2 idea seems to work. so q2p2s2q1t5 white is dead. and q2p2s2s1r1t3 leads to ko.
Playing S2 instead of T2 as the first move should give the same result. S2 T4 T2