Life on the second and third lines series #1. Other problem(s) in the series: 22664, 22803, 22829, 22339 (Thanks to BartTM for a variation.)
(
;
AB [lr][mr][nr][or][pq][qq]
AW [kq][kr][mp][op][oq][pp][qp][rp][rn]
C [White to play.]
(; W [rr]; B [qr] (; W [ps]; B [rq] (; W [sq]; B [qs] (; W [os]; B [pr] (; W [sp] C [RIGHT][Correct, but leaves extra ko threats.])(; W [sr] C [RIGHT][Correct, but leaves extra ko threats.]))(; W [ls]; B [pr] (; W [sp] C [RIGHT][Correct, but leaves extra ko threats.])(; W [sr] C [RIGHT][Perfect!]))(; W [sp]; B [os])(; W [sr]; B [os])(; W [rs]; B [pr]))(; W [qs]; B [sr]))(; W [rq]; B [ps])(; W [qs]; B [rs] (; W [ss]; B [ps] C [Ko for life. You could have killed unconditionally.])(; W [ps]; B [rq] (; W [sq]; B [sr])(; W [sr]; B [sq]))(; W [rq]; B [ps])))
(; W [qr]; B [rr] C [Miai.] TR [rq][pr])
(; W [rq]; B [qr] C [Miai.] TR [ps][rr])
(; W [ls]; B [ps] C [Miai.] TR [ms][ns] SQ [qr][rr])
(; W [ps]; B [rr])
)