In the endgame, black is looking to capture the white stones. What can he/she get here? Thanks to laocoon for an important comment.
(
;
AB [kr][ks][lq][ls][mq][nq][oq][pq][qr]
AW [hr][iq][jq][kq][lr][mr][nr][ns][or]
C [Black to play. What is the result for the marked stones? (D = Dead; A = Alive with territory; S = Seki; KB = Ko, adv. for Black; KW - Ko, adv. for White)][FORCE]
LB [jo:D][ko:A][lo:S][mo:KB][no:KW]
TR [lr][mr][nr][ns][or]
(; B [ko] C [Nope, Black can get something with the correct play.])
(; B [lo] C [Nope, the result is not a seki. Try again.])
(; B [no] C [Nope, Black can get a better result than this.])
(
; B [jo]; W [jn] C [Demonstrate.]
(; B [pr]; W [jr])
(; B [ps]; W [jr])
(; B [is]; W [jr])
(; B [ms]; W [jr])
(
; B [jr]; W [ps]
(; B [ir]; W [is]; B [pr]; W [hs]; B [qs]; W [js]; B [os]; W [ms]; B [kr]; W [ps] C [Ko, adv. for White.])
(; B [is]; W [ir]; B [pr]; W [hs]; B [qs]; W [js]; B [os]; W [ms]; B [kr]; W [ps] C [Ko, adv. for White.])
(; B [pr]; W [ir] (; B [is]; W [hs]; B [qs]; W [js]; B [os]; W [ms]; B [kr]; W [ps] C [Ko, adv. for White.])(; B [qs]; W [is]; B [os] C [Ko, adv. for Black.]))
)
)
(
; B [mo]; W [mn] C [Demonstrate.]
(; B [pr]; W [jr])
(; B [ps]; W [jr])
(; B [is]; W [jr])
(; B [ms]; W [jr])
(
; B [jr]; W [ps]
(; B [ir]; W [is]; B [pr]; W [hs]; B [qs]; W [js]; B [os]; W [ms]; B [kr]; W [ps] C [Ko, adv. for White.])
(; B [is]; W [ir]; B [pr]; W [hs]; B [qs]; W [js]; B [os]; W [ms]; B [kr]; W [ps] C [Ko, adv. for White.])
(; B [pr]; W [ir] (; B [is]; W [hs]; B [qs]; W [js]; B [os]; W [ms]; B [kr]; W [ps] C [Ko, adv. for White.])(; B [qs]; W [is]; B [os] C [Ko, adv. for Black. Well done!][RIGHT]))
)
)
)