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2007-08-06
Problem diagram.
White plays.
Source:
Qi Jing Zhong Miao #149 , an ancient collection of mostly kyu level life and death problems.
This problem is an interesting exercise in recognizing, making, and even proving(!) the existence of an eye.
Analysis:
Myron Souris
Solution follows
(or click here to download SGF)
Correct.
White 1 is the vital spot.
(Download the SGF to play through more variations than those shown here.)
Through 8, Black seemingly makes 2 eyes.
But with the subtle and nasty surprise of 9, White robs Black of any eyes
in the corner!
If Black does not respond to White 9 and insists that White has the burden of
proving that his group is dead, White would simply fill all of Black's outside
liberties, leaving only 1 internal liberty from the eye on the bottom edge.
See the next diagram for what would then happen in the corner.
Continuation.
Black 10 would then have to capture the 4 White stones.
But White plays 11 to capture the 2 Black stones.
Black can no longer argue. Black is dead.
White mistake.
White cannot simply connect out with 5.
Through 8, Black has 2 eyes in the corner, not one or zero!
White mistake.
White has to be very careful about the proper move order.
White 3 gives Black time to play at 4, which makes one eye immediately,
and then makes a play at A or B miai for the second eye.
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