Dark chess
| a | b | c | d | e | f | g | h | ||
| 8 | 8 | ||||||||
| 7 | 7 | ||||||||
| 6 | 6 | ||||||||
| 5 | 5 | ||||||||
| 4 | 4 | ||||||||
| 3 | 3 | ||||||||
| 2 | 2 | ||||||||
| 1 | 1 | ||||||||
| a | b | c | d | e | f | g | h | ||
A game of Dark chess in progress from the point of view of White. The crosses indicate squares that cannot be seen. White can see which pieces are on a4 and b4 because White's pawns would normally be able to move there. (In some versions of Dark chess, a4 and b4 would be dark, since pawns do not move the same way they capture; but White would be able to infer that there are unknown enemy pieces there because otherwise White's pawns would be able to move there.)
Dark chess (also known as Fog of War chess) is a chess variant with incomplete information, similar to Kriegspiel. It was invented by Jens Bæk Nielsen and Torben Osted in 1989. A player does not see the entire board – only their own pieces and the squares that they can legally move to.