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Y on a Closed Surface

Public forum discussion.

Hex, Havannah

#1 · HexNash

17 May 2011

As shown in the "Hex on a Torus" topic, it is possible to generalize Hex on a closed surface (a board with no boundaries) with various winning conditions:

If the winning conditions are:

Red: A vertical loop

Blue: A horizontal loop

This minimum setup works:

(Torus)

http://img59.imageshack.us/img59/7420/torustohex.png

If the winning conditions are:

Red: Prevent blue from making any loop

Blue: Any loop

This minimum setup works:

(Torus)

http://img33.imageshack.us/img33/1672/torustohexalt.png

(Discovered by Jonathan Rydh)

Now, my new question is this: Is it possible to generalize Y on a closed surface?

I am almost positive that it cannot be generalized on a torus. However, what about a different closed surface, such as a sphere, Klein bottle, or real projective plane?

#2 · ypercube

17 May 2011

I'm not yet convinced for the Hex on torus variant...