Tsumego frame for life/death problems

[kaorahi]

I imported "tsumego frame" from lizgoban as an exercise of python. It helps AI to solve life/death problems slightly better than mere use of "smaller board" or "region of interest". Does anyone want to use this feature seriously?

(black to play: from https://www.h-eba.com/heba/tumego/eba.html)

• Fill the rest of the board evenly so that katago concentrates on the problem.
• Set ko threats only for the opponent so that katago finds unconditional solutions (not ko solutions). This seems important in my experiences.

(tentative usage)

1. Put a problem on the 19x19 board.
2. Hit u key to copy tsumego frame to clipboard. (shift+u for ko problem)
3. Hit ctrl+v to paste it.
4. Set region of interest manually from Analysis Options if you like more efficient search.

I dare to require ctrl+v to avoid unintentional loss of the current board by an accidental hit of u.

https://github.com/kaorahi/katrain/tree/tsumego_frame

[sanderland]

Will have a look later

[sanderland]

in branch now under tsumegoframe

Issues

The wall is quite close, e.g.

Ctrl-v is awkward. Any reason we can't just add the AB/AW as an additional node to the current position?

[kaorahi]

We can increase margin = 2 if the wall is too close. Or, we need to add a black stone manually around C14 beforehand. (This algorithm is far from perfect anyway. It fails in some cases.)

Ctrl-v is just a quick hack as I'm not sure how to append AB/AW in katrain.

...and I pushed a bug fix 814529e to https://github.com/kaorahi/katrain/tree/tsumego_frame . I missed translation of some logic from the original JS code.

https://github.com/kaorahi/lizgoban/blob/master/src/tsumego_frame.js
https://github.com/kaorahi/lizgoban/blob/v0.7.0-pre2/src/tsumego_frame.js

[sanderland]

See cd61a18 for some work on using AB/AW and a little more natural python instead of flatten (and reformatting with black)

[kaorahi]

Thanks for the revision!

[sanderland]

Menus + analysis region setting added and merged into 1.11 at #506 , please test :)

[kaorahi]

It seems to work well in brief tests. :)

[kaorahi]

The default margin 5 may be too large? It destroys ko threats in large size problems.

[sanderland]

Can you give an example?

[kaorahi]

If I allow ko in this problem, no room is left for B's ko threats.

(The third problem in https://www.h-eba.com/heba/tumego/eba.html)

[sanderland]

it's a tough balance, but i've set it to 4 now

[sanderland]

Closing as it's released

[xiaoyifang]

katrain support arbitary board size ,which means ,you can do this.

based on the above picture ,what about a new way to solve life/death problem.
drag the region around the place(this function is already existed),then shrink the board size to the region.