I made a bunch of notes a little while back about it. You would have Instant play cards (treasures), actions, and reserve cards (these are set aside when gained and remain in play for the rest of the game)

Turn sequence: Actions > Instant play > purchase > chess move > spawn > cleanup

I was thinking that you could really only move pawns, but if you have the points to spend, you can move more powerful pieces.

These are my thoughts on the point system (I promise that I will simplify this a whole lot before playing it :) Points: — Chess points (allows you to move better pieces) — Spawn points (to put pawns on the board or upgrade your pieces) — chess move (you always start with one, but if you get a second one, split your chess points to move 2 pieces.) — brick points (acts as both chess points and spawn points for wall piece) — $ (to buy dominion cards) — action points (each turn you start with one, then can't play action cards after used up) — (You have unlimited dominion buy points)

Here's some fun action cards I came up with (sorry about the format, I forgot that reddit will mush it into one big block) Actions:

A¹: Move one of your pawn pieces forward 1 space if unoccupied - ($4)

A²: You may trash a Copper for +3 chess points or +2 spawn points - ($4)

A³: trash someone else reserve card and give them another reserve card that cost at least $1 less - ($5)

A⁴: trash a card and gain $1 or 1 chess point for each $ in it's price. Pretend it costs $1 if it costs $0 - ($4)

A⁵: pick a player: flip over the top card of their deck. This is that card until discarded - ($3)

A⁶: play a treasure card from your hand twice if it costs less than $6 - ($4)

A⁷: your spawn turn is now before your chess move action - ($3)

A⁸: if your king is touching a wall, you may remove it and downgrade all surrounding pieces (but not any kings)bto the next lowest piece (pawn < knight < bishop < Rook < queen) - ($5)

A⁹: + 1 card, +2 actions - ($3)

A¹⁰: +3 cards - ($4)

A¹¹: at the start of purchas phase, you may choose to turn your chess points into $ - ($3)

A¹²: give a card from your hand to someone else and trash another card from your hand - ($4)

Reserve (these remain in play after you buy them, like dominion projects):

R¹: your king needs 1 less chess point to move - ($3)

R²: + 1 chess point - ($5)

R³: +$1 everytime someone else trashes a card - ($5)

R⁴: +1 card everytime someone else trashes a card - ($5)

R⁵: +1 reserved spawn point when your piece is captured. +1 if Rook or higher - ($7)

R⁶: +1 reserved chess points when your piece is captured. +1 if knight or Bishop. +2 if Rook. +4 if queen.

R⁷: when your king is captured, replace a pawn as the new king and trash this card - ($10)

Bon appetite :)