How to play Penultima (Chess)

Learn the rules to Penultima (Chess) quickly and concisely - This video has no distractions, just the rules. For a refresher of the original Chess rules, check out this video: https://youtu.be/fKxG8KjH1Qg

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RULES:
Several Spectators create secret rules which change how the chess pieces move and interact. The players playing the game try to discover these rules as they attempt to checkmate their opponent.

Before the game begins, the Spectators decide between themselves which pieces each of them will write rules for, then each of them writes down their rules. Each spectator may only create rules for 1 piece type: for example: all the pawns. These rules may control the way a piece moves, captures, is captured, OR if it causes an effect to other pieces on the board. A piece may be given an “invoke” command which causes it to affect other pieces on the board without moving. A Spectator can combine any or all of these types of rules together for their piece and they can have a piece’s rule affect other pieces. When creating rules, it is recommended to keep it simple, concise, and specific. For example, you could write down that the king may invoke to trade places with a friendly rook.

After a spectator finishes writing a secret rule for a piece, that Spectator also gives that piece a new name for the duration of the game. These names, and the existence of any invoke commands, are announced to the players at the start of the game. After the game has started, the spectators may privately discuss how their rules interact.

On your turn, you must attempt to move or invoke one of your pieces, then the Spectator for that piece declares whether the action is legal or illegal. If it is legal move, the piece stays where it is. If an invocation is performed, then the spectator of that rule performs the action of the invocation without saying what the invocation does exactly, unless player input for a choice is needed; then it is vaguely asked. Then your turn ends.

To continue the example, a player says I invoke my king. The spectator then says pick a rook. The player picks one and the invoke is performed by the spectator without saying more.

If you perform an illegal move, then the piece is returned to its position from the start of the turn. If the invoke isn’t allowed, then it is stated and nothing happens. In the original game, your turn would then end without a legal move being performed, however, there is a variant that you can play where you continue attempting, until you perform a legal move or invoke. Decide which version you will play at the start of the game. If playing with the first option, the only exception is if you are in "check", then you can repeatedly attempt moves until you are able to get out of check. Spectators may need to say check to inform the players when their rule is causing a check. You can also play that the check rule is ignored.

The first player to checkmate their opponent wins, after which, Spectators reveal their rules.