The same as a CompleX Chess game, except that Pieces backward move[ment]s are all the same!

The object of the SimpleX Chess game is to CheckMate the opponent's King!

SimpleX Chess game is played 'til opponent's King is CheckMated or one of win/lose/draw conditions occurs.

In SimpleX Chess game backward piece move[ment]s are all the same!

The King in SimpleX Chess game is [or not] a Royal piece [depending on Variant]!

Note: On 'vs' variants your goal might be to AssAssinate/Blockade/Capture/Eliminate/SpyMate, and/or CheckMate different pieces than your opponent has to!

Have Fun & Enjoy!