Editing Domineering (section)

===Horizontal rows===
[[Image:20x20square.png]][[Image:20x20square.png]]

This game is a 2-by-1 grid.  There is a convention of assigning the game a [[positive number]] when Left is winning and a [[negative number|negative]] one when Right is winning. In this case, Left has no moves, while Right can play a domino to cover the entire board, leaving nothing, which is clearly a zero game. Thus in [[surreal number]] notation, this game is <nowiki>{|</nowiki>0} = −1. This makes sense, as this grid is a 1-move advantage for Right.

[[Image:20x20square.png]][[Image:20x20square.png]][[Image:20x20square.png]]

This game is also <nowiki>{|</nowiki>0} = −1, because a single box is unplayable.

[[Image:20x20square.png]][[Image:20x20square.png]][[Image:20x20square.png]][[Image:20x20square.png]]

This grid is the first case of a choice. Right ''could'' play the left two boxes, leaving −1. The rightmost boxes leave −1 as well. He could also play the middle two boxes, leaving two single boxes. This option leaves 0+0 = 0. Thus this game can be expressed as <nowiki>{|</nowiki>0,−1}. This is −2. If this game is played in conjunction with other games, this is two free moves for Right.

====Vertical rows====
Vertical columns are evaluated in the same way. If there is a row of 2''n'' or 2''n''+1 boxes, it counts as −''n''. A column of such size counts as +''n''.