Four armies meet on a cross-shaped battlefield. The moves are the moves you already know — this is chess, and every piece obeys the rules it always has. What changes is the geography and the politics.
You are not here to survive. You are here to destroy the king directly across from you — your opposite, your designated kill. Everything else on the board is obstacle, weapon, or temporary ally. Be the first to take your throne, and the war is yours.
A standard 8×8 heart with a three-rank arm thrown out from each side — the cross. Your army musters on your arm; your target waits on the arm directly opposite. Because the board is open and wide, your pieces breathe: a bishop cutting through the center crosses far more ground than it ever could in a cramped corner, and a knight near the heart has a wider fan of landing squares. Same rules, more reach.
Three ancient and brutal forces, and one cold synthetic intruder. Each is built from glowing wireframe with a soul core trapped inside the shell — the light you are trying to put out. Each faction dies its own death.
Bone constructs — skulls, spines, ribcages. Marrow-light glows in the hollows.
Brutalist war-machines — blades, gears, pistons, rebar. A furnace burns at the core.
Tribal idols and ritual masks. A captured spirit-fire flickers within.
Circuit-trace geometry and holographic grids. A data-core processes at its heart.
Every piece moves exactly as it does in classic chess — the knight's L, the bishop's diagonal, castling, all of it. The cross simply gives those moves more room to run. Nothing about how a piece moves is rewritten.
The king follows ordinary chess law, fully enforced. You may never move your king into check, and you may never make any move that leaves your own king in check. The only difference from two-player chess: three other armies can put you in check instead of one, and the open cross board hands everyone more lines of attack. The rules don't change — the crossfire does.
The two armies beside you are not your assigned enemies. You may cut down any enemy piece that falls into your lines — or leave it be. Engage, ignore, or coexist. The board is a negotiation.
You win by being the first to checkmate the king directly across from you. Not capture — checkmate, exactly as in real chess: their king under attack with no legal escape. Not the nearest king. Not the weakest. Your opposite. That mate — and only that mate — crowns you.
If another army checkmates your target before you do, your path to victory dies with that king — but you do not. Your own king still stands, so your army fights on. You can no longer win, but you are still armed and still dangerous: a free agent who can swing the whole war. Avenge the theft, broker an alliance, or block the next throne. Power without a crown is still power.
If a player has no legal move but is not in check, that's a stalemate — and what it means depends on how many armies remain:
Three or more armies alive — STANDOFF. The stalemated player is locked: they pass their turns and stay fully on the board, all pieces active, but cannot move. The lock breaks one of two ways — the position opens so they can move again, or another army marches over and interferes by force. A stalemate in a crowded war just means you're frozen and exposed while everyone else keeps playing around you.
Only two armies left — TRUE STALEMATE. With no one else to break the lock, it resolves as standard chess: the war ends in a draw, no winner.
When a king falls, that army does not vanish. Its pieces freeze where they stand — silent, unmovable, lifeless. They no longer act, but they are still there: walls of dead iron and bone clogging the lines of fire.
If a frozen piece blocks your path, you must capture it out of the way the same as any living piece — spending real moves to clear it. Or leave it standing as a barricade against your rivals. A dead army is no longer a player. It is terrain — and where it died reshapes the entire endgame.
Sometimes both kings of a duel-pair fall, yet the two players who were hunting them are still alive — each robbed of the target they needed. Neither can complete their kill. The war cannot end the normal way.
So it converts. The board enters Ultimatum Death: a final reckoning between everyone still standing. No more designated targets, no more duels — just the last king alive. Whoever remains when the dust settles takes the throne by sheer survival.