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# Tenet Inversion Chess

Chess with time-traveling inverted-entropy pawns
 (+4) [vote for, against]

In the universe of the movie Tenet it's possible for objects and people to be inverted so that they move backwards through time.

It would be fun to create a variation of Chess that's inspired by the time-inversion physics of the movie.

Here's what I'm thinking:

Starting position is the same as standard chess except, all pawns are removed from the board and set aside.

All pawns are inverted in time. Meaning, they can be uncaptured and their only legal move is backwards on the board, except when on row 4 they can move backwards either one or two squares to row 2.

Un-capture is possible when an enemy piece is sitting on a square that could legally have held a pawn. Uncapture is executed by moving the enemy piece back to valid prior square and then "materializing" a pawn in the square where the enemy piece was just sitting in the near future (as described by a time-forwards observer).

Any time a pawn is moved (including at the uncapture move), it is experiencing time in reverse, and so it also has the effect of undoing the last normal move and also rewinding the clock to where it was at the start of the previous turn.

At every turn, players can choose to use their other pieces to make normal moves which propagate forward in time, like normal chess, or inverted pawn moves which are essentially a forced rewrite of history one move at a time.

 — ignobel, Feb 05 2022

A version of Tenet Inversion Chess... https://www.youtube...watch?v=5M5RE1M3uY0
...as practised by Garry Kasparov. [DrBob, Feb 06 2022]

3-D chess 3-D_20chess
[Voice, Feb 09 2022]

 Whoa. Interesting.

So just about any space could legaly be pawn- occupied, save the bottom row, or ones that have column already accounted for by other pawns, who themselves could've diagonally moved there. This could be really disruptive and hard to figure out.
 — RayfordSteele, Feb 06 2022

 This hurts my head a bit.

(+)
 — 2 fries shy of a happy meal, Feb 06 2022

 I think this shifts the balance a little against black.

You see, the obvious opening is q×q, k×q, which leaves the two sides even in material and position, but black is no longer able to castle.
 — pertinax, Feb 06 2022

Hmm. So how would you handle pawn promotion under these rules? In theory, I can move any enemy piece off of its own back rank & replace it with one of my own pieces; usually, but not always, a Queen & just as long as I have an available pawn to play from off-board. It can instantly be re-captured by the piece you just moved but it could be tactically advantageous. By guaranteeing a perpetual check, for example. So on move 1, White moves the black queen away from d8 & replaces with a White Queen. Black can capture using either Q or K but then White simply repeats the maneuvre ad infinitum.

I disagree with pertinax's opening move. For me Rh1 x Rh8 is better, as the rook cannot be re-captured & is free to run riot along black's back rank.
 — DrBob, Feb 06 2022

So the pawns are more or less moving backwards to default starting position? What's to prevent claims that EVERY location could have had a pawn there, barring the usual starting positions of opposition pieces?
 — 4and20, Feb 06 2022

Limited supply of pawns
 — pocmloc, Feb 06 2022

 I was playing chess with a friend the other day and he said 'let's make this interesting.'

So we stopped playing chess.
 — RayfordSteele, Feb 15 2022

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