Life In 19x19

This one (rated as 7d) was solved in 3-4 mins:

(;FF[4]SZ[9]
C[goproblems/21185, white lives by extending]
TR[cb]
AB[ia][ib][ac][bc][gc][hc][ic][bd][ed][fd][gd][be][ce][de][ee]
AW[aa][ha][ab][bb][gb][ec][fc][cd]

)

A quite impressive result given that the solver doesn't have any domain ...

ko is a tricky topic. At the moment modeling ko in the solver is simple: it's given the number of external ko treats and if while solving it needs to recapture a stone, it checks if the number of ko treats allows that, decrements that number and proceeds.

What it should ideally do is it should ...

I had to fix a few things to make it work in Firefox. Please try https://d180cf.github.io/ (it will redirect you to /v0.1.1). Still doesn't work in IE/Edge (I know what to fix, though) and not tested in Safari. Btw, the https: prefix seems to be important: otherwise Chrome doesn't load a few sgf ...

Could you guys check if you see the 3 pics of the board in the tutorial? Those 3 pics are also made with SVG. If you do see them, then the problem must be on JS side.

Here is my attempt to write a tsumego solver: https://d180cf.github.io/

For now it solves only fully enclosed tsumegos, but most of reasonably enclosed tsumegos can be easily fixed. With this in mind, this solver is capable enough to solve even 4d rated problems like this one: (though I personally ...

I came up with the same idea half a year ago: to write a strong tsumego solver and use it in sites like goproblems. At that moment I estimated the task as "rougly two days of work to implement a basic depth-first search and another day to make it handle ko fights" and I had good reasons to think so ...