Black to move, conditional solutions are suspect.
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#23a Advanced problem
$$Bc
$$----------
$$|.........
$$|.OOO.....
$$|OXXXOO.X.
$$|.X.OXXX..
$$|.X.O.....
$$|..X.O....
$$|.........
$$----------
$$|.........
$$|.OOO.....
$$|OXXXOO.X.
$$|.X.OXXX..
$$|.X.O.....
$$|..X.O....
$$|.........
- Click Here To Show Diagram Code
[go]$$Bc
$$----------
$$|.........
$$|.OOO.....
$$|OXXXOO.X.
$$|.X.OXXX..
$$|.X.O.....
$$|..X.O....
$$|.........[/go]
$$Bc
$$-------
$$|....X.
$$|XOOOX.
$$|..OXX.
$$|OOOX..
$$|XXXX..
$$|......
$$-------
$$|....X.
$$|XOOOX.
$$|..OXX.
$$|OOOX..
$$|XXXX..
$$|......
- Click Here To Show Diagram Code
[go]$$Bc
$$-------
$$|....X.
$$|XOOOX.
$$|..OXX.
$$|OOOX..
$$|XXXX..
$$|......[/go]
$$Bc
$$--------
$$|.......
$$|.XXXO..
$$|.XOO.O.
$$|.X.,...
$$|.OOO...
$$|.......
$$--------
$$|.......
$$|.XXXO..
$$|.XOO.O.
$$|.X.,...
$$|.OOO...
$$|.......
- Click Here To Show Diagram Code
[go]$$Bc
$$--------
$$|.......
$$|.XXXO..
$$|.XOO.O.
$$|.X.,...
$$|.OOO...
$$|.......[/go]