> FWIW, first-capture go (i.e. winner is first one to make a capture) should 
> not be PSPACE-complete.

Actually this is not obvious.

If you are able to replace the White Choice gadget shown at page V in
this paper: https://tromp.github.io/lad.ps with an equivalent Go
gadget that doesn't capture any stone then I believe you actually
prove that first-capture go is PSPACE complete.

--Marcel

On 18 June 2018 at 20:17, Marcel Crasmaru <crasma...@gmail.com> wrote:
> You can also find here one of my attempts to create a difficult Robson
> like problem on a Go board but I guess I've run into difficulties and
> didn't finish it:
>
> https://senseis.xmp.net/?Crasmarum%2FStrangeTsumego
>
> However, it might help you understand how to convert Robson's problem
> instances to equivalent Go positions.
>
> --Marcel
>
> On 18 June 2018 at 18:42, Mario Xerxes Castelán Castro
> <marioxcc...@yandex.com> wrote:
>> Thanks you very much, Marcel. I will be reading your thesis. I am
>> interested in formalizing results about the game of Go as my next
>> project. I have have a repository of computer-verified proofs here:
>> https://puszcza.gnu.org.ua/projects/hol-proofs/ Right now I am still
>> finishing a formalization of algorithms for handling dates in the
>> Gregorian calendar (the ordinary calendar).
>>
>> Regards.
>>
>> On 18/06/18 13:23, Marcel Crasmaru wrote:
>>> Hi Mario,
>>>
>>>>   J. M. Robson (1983) “The Complexity of Go”. Proceedings of the IFIP 
>>>> Congress 1983 p. 413-417.
>>>
>>> If you are interested in how to prove that GO with kos and Japanese
>>> rules is EXP complete you can get an idea from my master thesis draft
>>> - I used Robson's idea with ladders instead of pipes (he had groups
>>> connected through long string of pieces, aka, "pipes")
>>>
>>> If you have related questions I am happy to answer them.
>>>
>>> Best,
>>> Marcel
>>>
>>
>>
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