Meigo game won by Black. The moves before the first marked stone placement are omitted. White resigned at the end.
Meigo is a Go variant that makes infinite loops impossible without using superko rules. The basic idea is that placements in enemy territory are made with marked stones, and you cannot place a marked stone and remove a marked stone on the same turn if the last stone placed on the board was marked. The result is a game that plays almost like Go, as you can see in these sample games:

• A 9x9 game.
• The 13x13 game displayed above.
• A 19x19 game following the moves of the longest known high-level Go game, which spans 417 moves (twice as long as a typical Go game) and features a whopping 79 ko captures. Recreating the game under Meigo rules requires making 4 illegal ko captures: moves 82, 304, 409 and 415. The first two of those are preceded by enemy ko captures, so making them illegal avoids potential n-tuple-ko cycles.

I recommend replaying the games with BesoGo. It's nicer than EidoGo, but has no hosting service.

"Territory" is a term with a different meaning. You mean "empty 'region' (or call it 'string') only surrounded by (that is, adjacent to) one player's stones".

You mean "may not" instead of "cannot".

From your text, marks are permanent (at least) as long as stones remain on the board. Is this your intention?

Does anyone play there variants which you keep inventing?

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North Lecale

Right. That's the way I usually define territory in my games, though.


You may or may not be right on that one.


Right, you unmark a stone by merging it with an unmarked stone of your color, and you need to remove an enemy group surrounding your marked stone in order to merge it with an unmarked stone of your color.

Hopefully someone will. This one is pretty good.

That's not how it works. Marked stones can be unmarked, but a stone that was unmarked when placed never becomes marked. For example, in this game, does not mark the black stone at A8.

The rules say:


A point reaches a stone if a path along the lines of the board can take you from one to the other without stepping onto an unmarked stone. Note that the path can go through marked stones of any colors.