Endgame Puzzle - Series 300

                                        

MATE IN 8

( Q + R + 4P + K +  vs Q + 2R + 3P + K )

Black to move

GM_Knockout said ;

1. ...Rcb8+!!
2. Kh7 Qe6+!
3. Kh8 Qe5+
4. c3 Qe6
5. c4 R8b1+!!
6. Rxb8 Qe5+!
7. Qc3 Qxc3+
8. Rb2 Qxb2#

OR

1. ...Rcb8+!!
2. Kh7 Qe6+!
3. Kh8 Qe5+
4. c3 Qe6
5. c4 R8b1+!!
6. Kxb8 Qb6+!
7. Qb3 Qxb3+
8. Ka1 Qb2#

OR

1. ...Rcb8+!!
2. Kh7 Qe6+!
3. Kh8 Qe5+
4. c3 Qe6
5. c4 R8b1+!!
6. Qxb8 Qe5+!
7. Rc3 Qxc3+
8. Qb2 Qxb2#

- Black won 0-1