Reach the far row.
Your opponent has one move to answer.
Select a piece. To move a line, select its other end, then choose the marked square where the leading piece will land.
History
Crossings appeared in the early 1960s as one of Robert Abbott’s abstract strategy games. Abbott was interested in how a small set of simple actions could give rise to unexpectedly complex strategy. The game used an ordinary 8×8 board and checkers: individual pieces could move alone, but the key feature was the way lines of pieces moved together as units. In 1969 its rules appeared in Sid Sackson’s A Gamut of Games, bringing it to a wider audience.
Abbott later returned to Crossings, enlarged the board to 12×14 and revised the capture rules. The result was Epaminondas in 1975, named after the Theban general and his phalanx manoeuvres. Abbott later called the change of name a rather foolish idea: Crossings was already short and memorable. The original game was the first version of a system he continued to develop for more than a decade.