Breakthrough is a race game. Its object is to first get a man onto the opponent's back row. Apart from the opponent, the wall is the most important obstacle in this quest.
The diagram shows the board and the pieces in the initial position. Players move in turn. White moves first.
The object of the game is to be the first player to get a man onto the opponent's back row. However, blocking the opponent completely also constitutes a win.
In turn, each player moves one of his pieces any number of squares diagonally, either forward or backward, with these restrictions:
If a move results in a square exceeding its capacity, the square explodes, which means that it shoots its men to the adjacent squares in forwards and sideways directions.
Men dispersed by an explosion ignore the second and third restriction listed above under movement. Thus an explosion may require a piece to be dispersed onto a square occupied by an opponent's piece. This piece, whether a single man or a pair, is captured and removed from play. There is one important exception:
Strategy is fairly obvious: you need an explosion from the far wall to get beyond. Side columns explode fastest, so a7 and e7 appear obvious targets for white to get his men on.
The drawback of this strategy is that, if successful, it gets a man across on the sidecolumn on a8 or e8, where a defender can block it with a single man on b9 or d9. If however the attacker next successfully targets the same square again by a second explosion from the same square on the wall he wins because this would cause the square on the eighth row to explode.
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