Miai Values List / 0.00 to 0.99

Sub-page of MiaiValuesList

See Miai Values List for conventions and explanation.

Table of contents Table of diagrams
Take 1/2-point button
Neutral point
Miai
Ko threat (teire)
Connect ko
Take ko
Hidden ko
Make ko
Take ko in sente
Make ko
Make ko (2)
Make ko (2a)
Take away potential point
Defend potential point
Take stone
Take away territory
Jump to take potential point
Defend potential point
Take away potential point
Take away potential point
Defend potential point
Under the stones sacrifice
Prevent sacrifice
Real half-point ko, W komaster
Make damezumari
Make territory plus
Real half-point ko, B komaster
Take away potential point, set up ko capture
Defend potential point, set up ko capture
Take stone to set up ko
Make ko
Take two stones
Take away territory (i)
Take away territory (ii)
Take three stones
Take away potential point (corridor)
Defend potential point, set up 0.67 position
Take away potential point
Sente
Reverse Sente
Protect, threaten 0.67 play
Take away potential point (corridor)
One more number
Take away potential point
Take away potential point (corridor)
Take away potential point (corridor)
Hidden ko (2)
Index of sub-pages

-0.5

[Diagram]

Take 1/2-point button

Initial count: 0

The 1/2-point button is used in some rulesets that try to form a compromise between area scoring and territory scoring. E.g., instead of playing or passing a player may take the one and only 1/2-point button (by area scoring).

The miai value by area scoring is 1/2 because if Black spends one move, he gets 1/2, while if White spends one move, he gets -1/2. The calculation is: (1/2 - (-1/2)) / 2 = 1/2.

To convert from area to territory scoring we subtract 1 point, yielding -0.5.

0.00

There are other types of neutral (dame) points including: protective moves (teire) against the cut when outside liberties are filled; capturing stones in seki, etc.



[Diagram]

Miai

Either player can play first, with the same result.

[Diagram]

Ko threat (teire)

B1 may be a ko threat. At the dame stage, an immediate W2 is a protective play.



0.33 (1/3)

[Diagram]

Connect ko

Initial count: -0.33

White has 1/3 point equity in the BC stone. We may think of it as 1/3 captured.

[Diagram]

Take ko

HolIgor: This move together with the one above should give a point, shouldn't it?

Bill: Yes, but Black started with 1/3 point net equity WC, so each move gains 1/3 point, on average. :-)

See half-point ko.

[Diagram]

Hidden ko

B3 fills.

Initial count: 0.67

1 and 2 are miai points.[3]



[Diagram]

Make ko

Initial count: 8.67



[Diagram]

Take ko in sente

Initial count: 5.67

[Diagram]

Make ko



[Diagram]

Make ko (2)

B1, preventing the ko, would also be worth 0.33.

[Diagram]

Make ko (2a)



0.5

[Diagram]

Take away potential point

Initial count: -0.5

[Diagram]

Defend potential point



[Diagram]

Take stone

Initial count: 1.5

[Diagram]

Take away territory

B3 at 1.

[Diagram]

Jump to take potential point

Initial count: -3.5

[Diagram]

Defend potential point

Initial count: 2.5

[Diagram]

Take away potential point



[Diagram]

Take away potential point

Initial count: -0.5

[Diagram]

Defend potential point



[Diagram]

Under the stones sacrifice

Initial count: -2.5

After B3 the corner is worth -2. White has captured 3 Black stones, but Black can claim the W2 stone.

(Note: If White is komaster she can make ko to protect W2, but Black gets 3 moves elsewhere.)

[Diagram]

Prevent sacrifice

After W1 White gets 2 Black stones plus 1 point of territory.



0.58 (7/12)

Now there is a 0.33 point play at a.

[Diagram]

Make territory plus

Now there is a 0.5 point play at a.

The swing is 1 point at [circled point] plus 0.5 - 0.33 = 0.17 in the corner in gote. That yields a miai value of 0.58.

If B were komonster, it would be 0.75.



0.67 (2/3)

[Diagram]

Take away potential point, set up ko capture

[Diagram]

Defend potential point, set up ko capture

[Diagram]

Take stone to set up ko

Ambiguous.

[Diagram]

Make ko

[Diagram]

Take two stones

[Diagram]

Take away territory (i)

[Diagram]

Take away territory (ii)

[Diagram]

Take three stones



0.75

[Diagram]

Take away potential point (corridor)



0.83

[Diagram]

Defend potential point, set up 0.67 position

[Diagram]

Take away potential point

[Diagram]

Sente

Take stone in sente, leaving 0.67 point play.

[Diagram]

Reverse Sente

Save stone, leaving 0.5 point play.

[Diagram]

Protect, threaten 0.67 play



0.88

[Diagram]

Take away potential point (corridor)

[Diagram]

Take away potential point



0.94

[Diagram]

Take away potential point (corridor)



0.97

[Diagram]

Take away potential point (corridor)



For higher values see /1.00 to 1.99, /2.00 and more.

Footnotes

[3] Bill, now I'm confused - I think. Black's sente - I've switched the colours for B1, W2. OK, so using miai values means sequences don't need to be flagged as such (sente, or gote). Ah, I get it: White connecting on either side leaves

[Diagram]

Hidden ko (2)



where Black has in effect 0.33.

Leaving this comment for others' benefit. Charles

Bill: This is an ambiguous position. Its miai value is 1/3, but Black can take one stone and threaten to connect with sente. Then, OC, the position still has a miai value of 1/3, and Black's sente has gained nothing locally. (It may have been a ko threat.) In thermographic terms, it has a blue mast up to temperature 1 2/3.


This is a copy of the living page "Miai Values List / 0.00 to 0.99" at Sensei's Library.
(OC) 2005 the Authors, published under the OpenContent License V1.0.
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