Crossings

Crossings is an abstract strategy game for two players published in Sid Sackson's A Gamut of Games and Stephen Addison's 100 Other Games to Play on a Chessboard

It can be played with a standard set of Checkers.

The object of the game is to reach the opposite side of the board, while preventing the opponent from doing the same, by
moving checkers in "phalanx" style. Crossings is effectively an ancestor of Epaminondas, but with two
crucial differences.
1) When phalanxes collide, only the front piece is captured.
2) Successfully "crossed" pieces are immobile and can't be captured.

Reimplemented-by:
Epaminondas on a 14x12 board