Answer

 

Black needs to play at to make a nose for his group there. If White could play there, the seven black stones in the corner would be dead.

After Black's good move, the marked stones are dead.










 
When the prisoners are taken off, it looks like this.

Black scores:
    16 territory on the right
     3 territory in the lower left corener
     3 prisoners
Black's total: 22 points

White scores:
    20 territory
     1 prisoner
White's total: 21 points

Black wins by 1 point.










Prisoners:
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UK Go Challenge home 1 November 2003