Mastering Stratego: Bluffing, Probing, and Endgame

Stratego is a partial-information board game published by Jumbo in 1947 and licensed since 1961 by Milton Bradley and now Hasbro. Each side hides 40 pieces of different ranks; the goal is to capture the opponent’s flag. Casual players see it as a guessing game. It is not. Strong play uses Scouts to probe, deduces piece ranks from movement patterns, and protects the flag with bomb arrangements that punish the obvious attacks. Mastering Stratego is mostly about reading the opponent.

The board and pieces

Stratego is played on a 10×10 grid. Each side has 40 pieces of various ranks:

• 1 Marshal (rank 1) — highest piece. Defeats every piece except the Spy.
• 1 General (rank 2).
• 2 Colonels (rank 3).
• 3 Majors (rank 4).
• 4 Captains (rank 5).
• 4 Lieutenants (rank 6).
• 4 Sergeants (rank 7).
• 5 Miners (rank 8) — the only piece that disarms bombs.
• 8 Scouts (rank 9) — move any distance in a straight line.
• 1 Spy (rank S) — beats the Marshal on attack only.
• 6 Bombs — immobile, defeat any attacker except a Miner.
• 1 Flag — immobile. Capturing it wins the game.

Pieces face away from the opponent; their identity is hidden until they engage. When two pieces clash, both are revealed; the lower rank wins and stays on the square (the loser is removed). Equal ranks both die.

Setup principles

Setup is the first major decision. Each player arranges their 40 pieces in the back four rows of their side before the game starts. The opponent does not see the arrangement.

Strong setup principles:

• Protect the flag. Standard arrangement: place the flag in a corner or near the back row, surrounded by bombs. Two or three bombs adjacent to the flag is the minimum defensive ring.
• Hide the Marshal early. The Marshal in the front row gets attacked by Scouts before you can use it. Keep the Marshal in the back rows.
• Vary patterns across games. Predictable setup (flag always in the same corner, bombs always in the same shape) gets punished by opponents who notice.
• Forward Scouts. Place a few Scouts in the front row for early probing. Sacrificing a Scout for information is often correct.

Scout probing

Scouts move any number of squares in a straight line, like a rook in chess. They are the only piece that can move more than one square per turn.

Two uses for Scouts:

1. Probing: attack an unknown opponent piece to learn its rank. A Scout sacrificed to reveal an opponent’s Colonel is information worth more than the Scout.
2. Long-range pressure: a Scout in open territory can threaten distant pieces. The opponent must either move the threatened piece or defend it.

The classic probing pattern: send a Scout to attack a row of opponent pieces. Each attack reveals one piece’s rank. After three or four probes, you have a partial map of the opponent’s strong pieces.

Piece deduction

Pieces do not reveal themselves except when attacking or attacked, but their movement gives away information. A piece that moves one square is not a bomb or flag (those cannot move). A piece that has not moved is potentially a bomb, the flag, or simply a hidden mover.

Strong players track:

• Which opponent pieces have moved at all. Pieces that have not moved are bomb/flag candidates. Pieces that have moved cannot be bombs.
• The Scouts’ moves. An opponent piece that moved several squares is almost certainly a Scout (only Scouts move multiple squares per turn).
• Engagements lost and won. When the opponent reveals a Major by attacking your Captain, that piece is known and you can track its movement.

Over the first 15-20 moves, the deduction map tightens. The remaining “unknown unknowns” shrink to a few pieces, and those are usually the high-value ones (Marshal, General, Spy) the opponent is hiding.

Spy vs Marshal

The Spy is the only piece that defeats the Marshal — but only when the Spy attacks. On defense, the Spy loses to any piece. This asymmetry is the most distinctive feature of Stratego.

Practical implications:

• Once the opponent’s Marshal is identified, the Spy is the priority attacker. Move the Spy toward the Marshal under cover.
• Conversely, when your Marshal is in play, watch for the opponent’s Spy. Any piece that has not been identified and is moving toward your Marshal is a Spy candidate.
• The Spy’s protection against discovery is its disguise. Move it with low frequency early to avoid identifying it as a special piece.

Bomb arrangements

Bombs are immobile defenders. The standard flag defense:

• Flag in a back corner.
• Bomb adjacent to the flag (the square that an attacker would reach to capture).
• Bombs on the squares that connect to the flag’s row from the front.

This ring forces the opponent to bring Miners (rank 8) to disarm bombs. Each Miner committed is one fewer Miner for other bombs elsewhere.

The standard counter-strategy: identify the bomb pattern by probing with disposable Scouts, then bring Miners. With 5 Miners and 6 bombs, the math is tight; usually one or two Miners die before the flag is reached.

Bluff and probe

Stratego has more bluff potential than most board games because piece identities are hidden.

Common bluffs:

• Acting like a Scout. Moving a non-Scout piece aggressively as if it were probing. The opponent may waste a high-rank piece on what they think is a sacrifice.
• Acting like a Marshal. Moving a mid-rank piece confidently into open territory. The opponent may avoid attacking with their high-rank pieces.
• Mock-defending a “bomb.” Surrounding an empty square or a low-rank piece as if it were a key bomb position. The opponent may waste Miners trying to disarm.

Bluffs work once. A bluff that gets called costs the bluffer the bluffed piece and reveals the deception. Use bluffs sparingly and against opponents who have shown they will react to them.

The endgame

Stratego endgames arrive when most pieces have been revealed or eliminated. With piece identities largely known, the game becomes a near-perfect-information board game.

Endgame priorities:

• Track every remaining piece’s location and rank.
• Identify the opponent’s flag region by their bomb pattern and their reluctance to attack certain squares.
• Commit Miners to disarm the flag’s bomb ring.
• Use your strongest remaining mobile piece to capture the flag once exposed.

If you have lost all your Miners and the opponent’s flag is bomb-protected, you cannot reach the flag — the game can become a draw if both sides are stuck.

Common mistakes

• Moving high-rank pieces early. A Marshal that engages on turn 5 reveals itself for a small gain.
• Predictable flag placement. The back corner with bombs is the standard, so opponents target it. Mix in alternative shapes.
• Wasting Scouts. Scouts probe; do not push them into pointless engagements.
• Losing the Spy without taking the Marshal. The Spy’s value is the Marshal kill. Wasted Spy moves are wasted equity.
• Ignoring piece movement patterns. Every move the opponent makes is information about their piece structure.

How to practice

Online Stratego is widely available through the official app and several community servers (Stratego.com, Hasbro’s official app). AI opponents at adjustable strength let you practice deduction without ego damage. Match length is around 20-40 minutes; expect a learning curve of dozens of games before deduction becomes routine.

For the history of the game (Stratego descends from the Chinese game Jungle Chess and the French game L’Attaque from the late 1800s) and the official rules, the Wikipedia article on Stratego is a solid reference. For similar partial-information board games, see our games like Stratego guide.

Frequently asked questions

What is the Spy’s role in Stratego?

The Spy is rank S (sometimes 0 or 10 depending on edition). It is the only piece that defeats the Marshal — but only on attack. On defense, the Spy loses to any piece. The Spy is therefore best used to ambush a revealed Marshal.

What can defeat a bomb in Stratego?

Only the Miner (rank 8). Every other piece that attacks a bomb is destroyed; the bomb remains on the square. Each side has 5 Miners and 6 bombs, so Miner allocation is a constant strategic concern.

How do Scouts move differently?

Scouts (rank 9) move any number of squares in a straight line (horizontally or vertically), as long as the path is clear. Every other mobile piece moves exactly one square per turn. Scouts can also attack at range, but the attack reveals them.

Is Stratego solved?

No, not in the chess-engine sense. The game has high information asymmetry and a complex setup space (millions of possible initial arrangements), making full solution computationally infeasible. Strong AI opponents exist but the game is not solved.

Where should you place the flag?

The classic placement is a back-row corner with bombs adjacent. The variant placement is a non-corner back-row position with bombs that protect the flag’s likely approach squares. Vary patterns across games to avoid predictability.

The bottom line

Mastering Stratego is information management: deducing piece ranks from movement, hiding your own ranks as long as possible, protecting the flag, and using Scouts to probe. The bluff and the Spy attack are the high-leverage moments; the rest is patient piece-by-piece deduction. When you need a hidden-information break, the Chrome Dino game hides nothing — just cacti.