07-13-2020, 12:45 PM
(This post was last modified: 07-13-2020, 12:49 PM by Crazy Rémi.)

I also struggled to figure out the rules.

I'll try to make a simple summary:

- winning with a line of 5 is always legal even if it is a double 3, double 4, or overline in another direction

- double 3 is forbidden

- double 4 is forbidden

- overline (more than 5) is forbidden

"double" means in two different directions. An open 4 where it is possible to win on both ends is not forbidden.

a 4 means 4 stones that can be completed into a winning 5 with at least one move.

an open 4 is a 4 with two winnings moves. For instance: ..xxxx..

a 3 means 3 stones that can be completed into an open 4. For instance ...xxx...

Whether 3 stones are really a 3 depends on whether the empty points of the line are legal, so you have recursive calls for move legality. In the example that you linked:

o.xxx..x

x cannot add a move to make it an open 4.

After oxxxx..x white can block with oxxxxo.x

After o.xxxx.x white can block with ooxxxx.x because moving at the '.' is illegal (overline).

This position has deep recursion:

https://twitter.com/Remi_Coulom/status/1...04/photo/1

Tianyi Hao is an organizer of the gomocup:

https://www.wind23.com/

He may be able to answer your questions and help with tournament organization

I'll try to make a simple summary:

- winning with a line of 5 is always legal even if it is a double 3, double 4, or overline in another direction

- double 3 is forbidden

- double 4 is forbidden

- overline (more than 5) is forbidden

"double" means in two different directions. An open 4 where it is possible to win on both ends is not forbidden.

a 4 means 4 stones that can be completed into a winning 5 with at least one move.

an open 4 is a 4 with two winnings moves. For instance: ..xxxx..

a 3 means 3 stones that can be completed into an open 4. For instance ...xxx...

Whether 3 stones are really a 3 depends on whether the empty points of the line are legal, so you have recursive calls for move legality. In the example that you linked:

o.xxx..x

x cannot add a move to make it an open 4.

After oxxxx..x white can block with oxxxxo.x

After o.xxxx.x white can block with ooxxxx.x because moving at the '.' is illegal (overline).

This position has deep recursion:

https://twitter.com/Remi_Coulom/status/1...04/photo/1

Tianyi Hao is an organizer of the gomocup:

https://www.wind23.com/

He may be able to answer your questions and help with tournament organization