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BeginnerExercise45

 

Beginner Exercise 45 / Solution
Sub-page of BeginnerExercise45

White first:

[Diagram]
White is independently alive

ChrisSchack: White first, I guess . . . the easy case. White lives in gote, one eye to none, with 9 points.

Robert Pauli: In real life, B2 should be spared as a ko threat.

[Diagram]
Failure: Seki

AdamMarquis: Since it is a beginner exercise, should this case not also be pointed out? Black's descent to the edge after White takes the throw-in makes it so that White can't approach. The result is seki (with a sending-two-returning-one option for White).



[Diagram]
Failure: Ko

However, White can patch up by not taking B2 and make a ko - a bit risky though.




Black first:

[Diagram]
White is dead

White just doesn't have the liberties needed anymore. (See next variant for W2 at B3.) This is 21 points for Black in gote. This seems big enough for either player not wanting to wait . . . but W2 should wait, it's a big ko threat.



[Diagram]
White is dead again

Confused: Here is the variant, White's still dead. White can't play at a because of a shortage of liberties.



[Diagram]
Failure: Seki

Robert Pauli: This nice seki results should Black start with hane, blindly following the proverb "the opponent's vital point is my vital point".

It features

  • an one-sided dame for Black (at W2)
  • a sending-two-returning-one option for Black (to the right of B1)
  • a sacrifice option for Black (filling both 2-1's and restoring seki via 2-2)






This is a copy of the living page "Beginner Exercise 45 / Solution" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.