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- J E T A N
- or "Martian Chess"
- by David M. Moorman
-
-
- LOADSTAR will go to ANY length to
- find quality programs for your C-64.
- On a recent excursion to the Fourth
- Planet, (via Edgar Rice Burroughs'
- classic tales), Fender observed John
- Carter, adventurer extraordinaire,
- playing a unique form of chess. The
- intricately carved and exquisitely
- bejeweled pieces (20 to a side) faced
- each other across a 10 x 10 board,
- with Orange to the north and Black to
- the south. The origins of Jetan are
- lost in the red sands of time, but
- the book explains much about the
- history of the game, as well as
- providing a rollicking good read.
-
- John Carter was kind enough to
- supply Fender with a list of the
- rules, which he sent to me. The
- moves are quite different than
- earthly chess, so the instructions
- module of the game will "show and
- tell" better than any words.
-
-
- THE GAME
- --------
-
- This is a two-player game, with
- both the joystick in port #2 and the
- keyboard working. Have one player use
- the joystick and the other use the
- keyboard -- or both can use the same
- input device. Black goes first. All
- opponent's possible 'next' moves are
- displayed on the board as cyan
- squares. Move the flashing cursor onto
- a piece and press FIRE or RETURN to
- select. The legal moves of the chosen
- piece are displayed as yellow (safe)
- squares and green (vulnerable)
- squares. Move the second, non-flashing
- cursor to the desired square and press
- FIRE or RETURN. To deselect a piece,
- move the cursor back onto the chosen
- piece and press FIRE or RETURN. Then
- choose another piece.
-
- The game is won when a player
- captures the opponent's Princess, or
- a Chief takes a Chief. If both players
- are reduced to five or fewer pieces
- for five complete rounds, the player
- with the highest capture value is
- considered the winner.
-
- The Princess may not move onto a
- threatened square, nor may she take
- an opposing piece. She is entitled,
- once during the game, during either
- player's turn, to move to any
- unoccupied space on the board. This
- move is called the ESCAPE. Orange
- presses F1, Black presses F7). Only
- the Princess may be moved during the
- ESCAPE. When finished, play resumes
- where interrupted.
-
- Whereas chess is a game of vectors
- and lines of force, JETAN involves
- spheres of influence and zones of
- power. The patterns of combined power
- constantly shift from side to side.
- Beware of the Fliers. Dwars are
- important. And remember, Panthans may
- look a lot like pawns, but they can
- move AND capture forward, sideways, or
- diagonally, though not backward.
-
-
- A MODEST PROPOSAL
- -----------------
-
- Though I haven't put in a computer
- driven player, I hereby challenge ML
- mavens to the task! There is plenty
- of room under ROM and between BASIC
- and the music. I will be glad to
- send specifications to anyone sending
- me a mailing label. And, should we
- find two or more computer players,
- we'll have to have a contest! First
- prize probably will not be a trip to
- Mars! But who knows!
-
- DM
-
- [FENDER'S POSTMUMBLE:] If anyone is up
- for figuring out how to make an
- intelligent Jetan-playing program,
- LOADSTAR is definitely up for
- publishing it. I congratulate Dave
- Moorman for capturing the spirit of
- Martian Chess and providing a valuable
- service for mankind. Can you imagine
- how traumatic it would be for the
- human psyche if, when we finally make
- it to Barsoom (as the Martians call
- their planet), they ridicule us
- because we can't play a decent game of
- Jetan?
-
- FT
-
- [DAVE'S REHASH:] I hope you enjoy
- these commentary conversations over
- decades of time. Jetan was published
- in 1993. I was still learning about ML
- and such, so I am amazed at how well
- it turned out! The deal for an
- Artificially Intelligent Jetan is
- still on. (Lance Thomas, are you
- interested?) I no longer remember what
- is inside the program, but I would be
- happy to help anyone parse it out. I
- do remember creating very specific
- ways for an Intelligence to play the
- game!
-
- DMM
-
-
-