In case the North West Passage means nothing to you, here's what Wikipedia has to say about it: 'For centuries, European explorers sought a navigable passage as a possible trade route to Asia. An ice-bound northern route was discovered in 1850 by the Irish explorer Robert McClure; it was through a more southerly opening in an area explored by the Scotsman John Rae in 1854 that Norwegian Roald Amundsen made the first complete passage in 1903–1906. Until 2009, the Arctic pack ice prevented regular marine shipping throughout most of the year. Arctic sea ice decline has rendered the waterways more navigable for ice navigation'.
Start. Position your eight pawns on the long diagonal running from your north west to your south east as in the top left diagram.
Object. To switch all your pawns to the opposite long diagonal running from south west to north east, as in the top right diagram.
Play. Normal rules of movement apply. If your passage is blocked by an opposing pawn occupying a square in the target diagonal that you can land on, you may land on it. Your opponent must then move it, and this counts as their next turn.
Game. Play ceases as soon as one player has filled the opposite diagonal, unless that player was the one who moved first, in which case the other may make one more move. If both succeed the game is drawn, otherwise the winner scores 1 point for each opposing pawn elsewhere than in its target diagonal.
Pawns move from red like a rook, from yellow like a bishop, from green like a knight, from blue like a king and not beyond the next square of the colour it started from. It may not jump or land on another pawn except to capture one of the opponent's.