Tewari Example 8

    Keywords: Theory

Table of contents Table of diagrams
19 point trick play
Continuation 1
Continuation 2
Continuation 3
Resulting position
Analysis
Efficient?
Paired stones removed

Trick play

[Diagram]

19 point trick play

B4 is the well known 19 point trick play.

[Diagram]

Continuation 1

With W7 and W9, white is falling for the trick.

[Diagram]

Continuation 2

[Diagram]

Continuation 3


Tewari analysis of the resulting position

[Diagram]

Resulting position

This is the end position of the trick play. Some players might argue that this is not so bad for white. After all, white did get at least 18 points (12 territory, 6 prisoners). And white can get some endgame around a. Is it really so bad, they might wonder?

[Diagram]

Analysis

So, lets do a tewari analysis by removing pairs of stones. When we remove pairs of stones, we try to remove the same number of inefficient stones for both players (including prisoners).

White has captured 6 stones (including one at white+square). None of the black stones are positioned particularly inefficient, so for this position to be even, there should be at most 6 white stones that are inefficient (and could be removed to compensate for the 6 black prisoners).

But when we evaluate the position, we can see that there are 8 superfluous white stones, marked white+circle. So the end result is not efficient for white, white has used too many inefficient moves here, compared to black.


Discussion

[Diagram]

Efficient?

comment: black+circle doesn't look that efficient either

reply: Well it prevents a white hane there. And if you consider the exchange white+circle-black+circle, neither of these moves is very efficient, but in the opening of the game, the white move white+circle on the second line is worse than the response black+circle.

[Diagram]

Paired stones removed

Bill: I paired the Black stone at circle with one of the White stones. White has clearly lost more than one move.


This is a copy of the living page "Tewari Example 8" at Sensei's Library.
(OC) 2014 the Authors, published under the OpenContent License V1.0.
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