OK I think there is one thing to be done to make the solution longer: 1. mark the middle ko and then 2. problem should be: B just captured in the middle ko and W is to move - is the group alive?
See here: https://drive.google.com/file/d/1J5Xn4XkOqSsYx0AEBQJj6EL-SjNqNq-o/view?usp=sharing Assuming x is the top ko, y the middle one etc. the problem is then equivalent to F = z && (y || x) with (x = 1, y = 0, z = 0, F is false) and W cannot play at y. As F is false W has to take the ko at z (x = 1, y = 0, z = 1, F becomes true) B takes at x (x = 0, y = 0, z = 1 F is false) W takes at y (x = 0, y = 1, z = 1, F true), B takes at z (x = 0, y = 1, z = 0, F false) and W is dead as no matter what W does F remains false (equivalent to ladders failing for W). --Marcel On 22 June 2018 at 22:27, Marcel Crasmaru <crasma...@gmail.com> wrote: > Errata: assuming x is the top ko then the formula encoded by this problem is > > z && (y || x) > > with x = 1, y = 0, z = 0 and W cannot play at z. Thus W is already > dead you cannot make the formula true. > > --Marcel > > On 22 June 2018 at 22:19, Marcel Crasmaru <crasma...@gmail.com> wrote: >> The position looks OK is great - I didn't find any side solutions. >> Just one observation: I think this encodes x && y || y || z and W is >> dead already thus is arguably a easier problem :) >> >> Should make for a great wall poster. >> >> On 22 June 2018 at 19:48, John Tromp <john.tr...@gmail.com> wrote: >>>>>>> at the bottom of my Go page http://tromp.github.io/go.html, which also >>>>>>> contains an sgf link. >>>>>>> Direct link to image: http://tromp.github.io/img/WO5lives.png >>> >>> Enlarging the board to 29x29 allows for a much better final (I hope) >>> look, close to my first attempt. >>> >>> -John >>> _______________________________________________ >>> Computer-go mailing list >>> Computer-go@computer-go.org >>> http://computer-go.org/mailman/listinfo/computer-go _______________________________________________ Computer-go mailing list Computer-go@computer-go.org http://computer-go.org/mailman/listinfo/computer-go
