A slip of the hand

lightvector · Post by **lightvector** » Sun Jul 17, 2011 8:30 pm

A slightly unusual problem I attempted to compose. I hope the solution works and I didn't screw anything up.

It's white's turn, and he is well on his way to victory. However, as he reaches to make his move, he accidentally drops the stone and it lands on the wrong spot! As a result, despite best efforts thereafter, white loses the game. How did this happen? For the purpose of scoring, assume japanese rules with 6.5 komi, and that no captures have happened yet.

Click Here To Show Diagram Code: [go]$$c White to play and lose, 6.5 komi $$ --------------------- $$ | . . . X . X O . . . | $$ | . O O X X X O . . O | $$ | . O X . X O X O O O | $$ | . O X X O O X X X X | $$ | . O . O O . O O X . | $$ | . . O . O O X . X . | $$ | . . O X . . X X . . | $$ | . . O O X X X . X . | $$ | . . . O O O X . . . | $$ | . . . . . . . . . . | $$ ---------------------[/go]

jts · Post by **jts** » Sun Jul 17, 2011 8:58 pm

lightvector · Post by **lightvector** » Sun Jul 17, 2011 9:04 pm

jts wrote:
I think any move inside his own or black's territory loses the game. For example: J10, H9, C10, and C6 seem to be the only winning moves for white. H5 would be a particularly spectacular way to lose, and if I'm counting wrong that must be the right answer.

For example: A5, H9, C10, H10, G1, H1, F1, H2, E4, and the score is W 22, B26.

jts · Post by **jts** » Sun Jul 17, 2011 9:19 pm

lightvector wrote:
jts wrote:
I think any move inside his own or black's territory loses the game. For example: J10, H9, C10, and C6 seem to be the only winning moves for white. H5 would be a particularly spectacular way to lose, and if I'm counting wrong that must be the right answer.

For example: A5, H9, C10, H10, G1, H1, F1, H2, E4, and the score is W 22, B26.

Did you take this into account?

lightvector wrote:For the purpose of scoring, assume japanese rules with 6.5 komi, and that no captures have happened yet.

Bill Spight · Post by **Bill Spight** » Mon Jul 18, 2011 6:35 am

HermanHiddema · Post by **HermanHiddema** » Mon Jul 18, 2011 6:44 am

because

Nice problem!

Bill Spight · Post by **Bill Spight** » Mon Jul 18, 2011 6:59 am

Life In 19x19

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