Practical Endgame Test 8/ Discussion

Slowman: my opinion: move 1 is worth 1.5 points (1+2 follow-up, so 3/2=1.5) But if white takes this point, he creates 3rd 2-point move, so he can take 2 of them

Bill: If that play is worth 1.5 points (deiri), why is W1 wrong in the next diagram, even though it is a bigger play (2 points deiri)?

[Diagram]

Black wins



[Diagram]

Jigo



Slowman: Sure, it is tedomari problem.


Bill: Sorry, Slowman, I missed your reply at the time.

Let's just look at the bottom two lines.

[Diagram]

Black first

Black makes one point at circle in gote.

[Diagram]

White first

White makes one point at square and threatens to capture black+circle.

We both agree that the next play is worth 2 points by deiri counting. But if W1 is worth only 1.5 points, then Black's reply is bigger, and Black should connect.

[Diagram]

Sente

By comparison with Black's playing first, White has one more point. So if we start off assuming that W1 is a 1.5 point gote, we are led to see it as a 1 point sente.

[Diagram]

1.5 point play

This is a 1.5 point play by deiri counting. If White plays first she gets two points (circle).

[Diagram]

1.5 point play

If Black plays first White has 0.5 point at circle, 1 point if White plays, no points if Black does. The swing is 1.5 points.


Slowman: Thanks, Bill


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