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Upside-Down Chess. White starts at the upper two rows, black at the bottom. (8x8, Cells: 64)
George Duke wrote on Wed, Mar 1, 2017 08:47 PM UTC:

White to Mate in 4. Since Black Queen is on white square, the Black Queen and King have already moved, and it means Black Pawns also have moved. So the present position started from the other side of the board! The board is actually left to right h to a, and up to down 1 to 8. (Dudeney and later Martin Gardner do this problem without the algebraic labelling.) Then White's Mate starts with 1 Nb8-d7. If 1 ...g1-h3, the mate is in two more moves. If 1 ...g1-f3, the mate is in three more moves. In the latter delay of the mate by one move, 2 N d7-c5 N f3-e5 3 Qxe5 4 N c5-d3 #.

George Duke wrote on Tue, Feb 28, 2017 09:27 PM UTC:Excellent ★★★★★

White is going north and Black south as usual in the CV Upside Down Chess.

For OrthoChess problem by Lord Dunsany, solve this:

White is to play and mate in four moves. The position is one that could occur in actual play of F.I.D.E. Chess.

Charles Gilman wrote on Mon, Jan 19, 2004 05:15 PM UTC:Good ★★★★
Another option to which this game is especially suited is the 'apprentice' rule of only promoting Pawns to the piece on whose file they started (except that King Pawns become Queens). This is because it is far easier to keep track of where Pawns started than it would be with the FIDE array.