Arena Chess · About the game

The world’s oldest war game, brought up to date.

Chess was designed for ancient war: two symmetric armies, one battlefield, and both generals seeing everything. War stopped working that way centuries ago. Arena is chess with the fog switched on: hidden traps, bought loyalties, and a contested sky over an 11×11 battlefield. The goal never changes. Checkmate.

Play free Play the tutorial How it works No account. Installs on your phone. One link starts a match.

01The thinking

Why touch a 1,500-year-old game?

Because the things that decide modern conflicts are precisely the things classical chess cannot express. Arena adds three of them, each as a mode you can switch on, and each mapped to a dynamic that has decided real wars.

Intelligence & deception

You never see the whole battlefield

Modern war is fought against what you cannot confirm: minefields, ambushes, false signals. Trapfield puts exactly that on the board. You will know a trap exists. You will not know where.

Economics & influence

Loyalty has a price

Wars are won in payrolls as often as on battlefields. Bribery gives every piece a price and lets you buy secret control of the opponent’s army, one double agent at a time.

The third domain

The sky changed what ground means

Air power rewrote land war: sensors that see everything, strikes with minutes of warning, defenses that gamble. Air War layers a full kill chain above the board.

Checkmate is still the only victory.Traps, coins and missiles shape the war. Only the King ends it. Nothing in the sky can mate.

Every secret makes a sound.Placing a trap, buying a piece, hiding a battery: the act is always announced. Only the location stays dark.

Everything is paid for.Every special action costs your turn, your points, or both. Nothing in Arena is free, including deception.

02The battlefield

11×11, with the classic core intact.

121 squares, 11 pawns a side. The standard eight pieces hold the middle of the back rank, King and Queen exactly where you learned them.
Three new flank pieces: a Jester on each wing, and the Wizard on the far queenside file.
Castling works on both wings. The King slides two squares toward either untouched Rook; the Rook lands on the square he crossed. Out of, through, or into check is still forbidden.
Pawns double-step off their starting rank and promote to a Queen on the far rank.
Check, checkmate and stalemate behave exactly as in classical chess.

The Jester

It fights like whatever you killed last. Your Jesters copy the move-set of your side’s most recent capture: take a Queen and both move like Queens, take a pawn and they shuffle like pawns. Dormant until first blood. Capture an enemy Jester and yours inherit whatever it knew. Doctrine spreads.

The Wizard

Cannot kill. Cannot die. Moves everything. It steps like a King, no piece may touch it, and once per turn it can lift any adjacent piece, yours or theirs, to any empty square. It can even evacuate your own King. Logistics wins wars: the side that redeploys fastest dictates the fight.

03Trapfield

Area denial. The ground itself takes sides.

Every army since Rome has shaped ground it never stood on. Minefields do not win battles; they decide where battles are allowed to happen. Trapfield gives you that lever.

Instead of moving, arm an invisible trap on any empty square, or under one of your own pieces as bait. It stays armed after your piece steps off.
Your opponent is told that a trap was placed. Never where.
Any enemy piece that lands on it is captured on the spot, credited to you, Jesters included.
Arm as many as you like, one per turn. Each placement spends that whole turn.
No traps on your own second or sixth rank, and none while you are in check.
Kings and Wizards never spring traps. Drones can reveal them.

04Bribery

The cheapest way to take a Rook was never a Bishop.

It was a purse. Both sides earn points: one per turn, plus the full value of every capture. Spend them on the only weapon chess never priced: the other army’s loyalty.

Twice per game, spend points to secretly buy an enemy piece. Anything but the King and Wizard.
The owner is told a piece was bought. They keep moving it, never knowing which.
On any of your turns, command your double agent instead of moving: it moves normally and can capture its own side, credited to you.
The first command reveals the bribe to both players. Control stays shared for the rest of the game.
Counter-intelligence: once revealed, the owner may execute the traitor: their own pieces can capture it and their own traps will spring on it. Executions earn nothing. Denial only.
If a bribed piece dies, the bribe dies with it.

05Air War

Sense. Strike. Deny.

A full kill chain in three assets, floating in a layer of its own: air power never blocks a piece, never gives check, and never delivers mate. It shapes the war. The ground still ends it.

Drone · 6 pts · 2 active

The sensor

Deploys publicly to any square; drifts up to 2 squares free, once a turn.
Its 5×5 view permanently reveals enemy traps and batteries it overflies.
It is your spotter: missiles can only strike squares a drone currently sees.

Missile · 12 pts · 2 per game

The shooter

Launch is public: a crosshair pulses on the target square.
It lands right after your opponent’s next move. One move to evacuate, teleport clear, or gamble on a hidden interceptor.
Destroys whatever stands there. Kings and Wizards are shielded. Friendly fire earns nothing.

Interceptor · 14 pts · 2 active

The denial

Hidden like a trap, on any empty square.
Auto-kills any missile landing within 2 squares, and any enemy drone that ends its turn within 2.
One shot each, then spent and revealed. Coverage is secret, so every launch is a wager.

06Ways to play

Thirty seconds to a match.

Challenge a friend: one shared link, no accounts. They open it, they are playing Black, in their orientation, on their device.
Fight the bot at three strengths, from loose and blundering to a machine that reads your replies.
Pass and play on one screen, with each player’s secrets hidden from the other.
Install it: Arena is a web app that lives on your home screen and works offline against the bot.
Mix the modes: every mode is a switch. Classical 8×8 with traps only? The full 11×11 with everything armed? Your call before every game.