Introduction
Yodd is an elegant connection and territory game for two players: Black and White. It is played on the cells of a hex hex board, which is initially empty. The suggested size is between 6 and 10 cells per side. Both players must have access to a sufficient number of black and white stones. The goal of the game is to end up with the least groups on the board. Draws are not possible.
Definitions
A group is a set of connected, like-colored stones. A single stone is also a group.
Rules
Starting with Black, players take turns placing one or two stones of any color on empty cells. On his first turn, Black can only place one stone.
At the end of each turn, there must be an odd number of groups on the board (i.e. the sum of the number of Black and White groups must be an odd number).
Players can pass their turn at any moment, unless it violates the previous rule (this means Black can't pass on his first turn).
When both players pass in succession, the game ends. The player with less groups on the board wins.
Notes on gameplay
Double placement serves both as a first move equalizer and a way to make the game playable under the group restriction rule.
Meanwhile, apart from the intended goal of eliminating draws (they would be common otherwise), forcing an odd number of groups at the end of a turn has some interesting tactical implications which make the game feel similar to a single placement game. For example, groups separated by two empty cells can't be joined on a single turn, since the player runs out of stones to restore the groups count to an odd number. Also, the diamond connection (two stones at each end of a four-cell rhombus) is safe if the opponent has exactly zero or two groups adjacent to the intermediate cells, and unsafe otherwise.
Endgames are also quite tricky under this rule: you'll often want to join two of your own groups or create another opponent group, but you'll be unable to do it because you can't restore the groups count anymore!
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