Quoridor Strategy: Tips and Tactics to Improve Your Game

Plan Your Route Before Placing Walls

Every decision in Quoridor starts with a count: how many moves does each pawn still need to reach its goal edge? Work out the shortest legal route for yourself and for your opponent, going around every wall on the board. The rest of this guide builds on that count.

The straight line is not always the shortest

Two walls side by side cover four columns, so cyan's straight route up the middle is blocked. Going around the right end takes two sideways steps and 8 steps in total. Going around the left end takes three sideways steps and 9 in total. White has the same trouble from the other side: one step left, then straight down, also 8.

That is an 8 to 8 tie with cyan on the move. When the counts are equal, the player who moves first arrives first, so cyan is a tempo ahead.

Balance direct progress against detours

A sideways step can feel like a wasted move, but when a wall is in the way it is part of the shortest route. The useful question is not "am I moving forward?" but "did that move make my count smaller?"

• Take the detour that shortens the count. A forward step into a dead end is worse than a sideways step toward the nearest gap.
• Stay flexible when two gaps cost about the same. A pawn that can use either of two distant gaps is harder to punish than one that has already committed, because one wall rarely closes both.
• Recount after every wall. A new wall can lengthen your route and also change which gap is nearest.

Only once you know both counts does it make sense to ask whether a wall would help.

Use Walls Efficiently

You have 10 walls, and a placed wall can never be moved. Each one also costs the move you would otherwise have made. That gives a simple way to price a wall:

In the position below, a row of walls has three gaps: one at the left edge, a two-wide one in the middle and one at the right edge. White stands at the middle gap and needs 4 steps. Cyan needs 5 and is on the move, so cyan is a step behind.

Wall A is placed right in front of white's path on open ground, so white simply steps aside. Wall B finishes the row of walls that was already there and shuts the nearest gap, so the next one is three squares away. After wall B cyan needs 5 steps and white needs 7. Same wall budget, very different result.

Where efficient walls come from

• Existing walls. A wall that closes a gap in a line, or joins two walls, can add several steps. On a nearly empty board, the best single wall adds only about one.
• Distance to the next opening. Closing a gap is worth the number of extra squares the pawn must walk to the next gap, so look for gaps whose neighbors are far away.
• Patience. Walls that add one step are rarely worth a slot. Save your walls for moments like wall B.

Balance Offense and Defense

Every wall changes the board for both pawns. Before you place one, count both routes after the wall, not just your opponent's.

A wall that hurts both players helps the one who moves next

Here both pawns need to pass through the same two-wide gap. Each needs 5 steps and cyan is on the move, so cyan is already winning the pure race. Closing the gap looks aggressive:

Both pawns now have a detour of three squares, so the count is 8 to 8. But the wall used up cyan's turn, so white is on the move at equal distance and arrives first. Cyan turned a winning race into a losing one and spent a wall to do it.

What defense actually means

In Quoridor, defense is mostly about keeping your own route hard to punish. Before each move, look at your route and ask: which single wall would add the most steps to me? If the answer is 3 or more, deal with it now:

• Step past the choke point before your opponent can close it (see "Recognize When to Move Instead").
• Choose a route where no single wall hurts that much, for example one with two gaps of similar cost.
• Take away the wall's slot, as shown in the advanced tactics below.

Offense and defense are the same arithmetic. A wall that adds more steps to your opponent than to you is attacking and defending at once. A wall that adds the same number to both is just a gift of the move.

Think Several Moves Ahead

Before you place a wall, play out your opponent's best reply, not just their reply to the position you have in mind. A wall also changes what they can do next.

Take the row of walls from the previous section, with cyan far over on the right side. Cyan needs 6 steps and white needs 4, with cyan on the move. Cyan is behind, so closing the middle gap looks attractive: it adds 3 steps to white's route (4 to 7) and nothing to cyan's (still 6). On paper cyan has gone from two steps behind to one step ahead.

Now look at the board from white's side. Cyan's wall left only the right-hand gaps and the left edge open. White's reply shuts the right-hand gap, which leaves a single opening at the far left. White is three squares from it. Cyan is seven columns away, so cyan's route grows from 6 to 13 while white's stays at 7.

The lesson is not "never close gaps". It is that a wall removes options for the player who is farther away, so check what is left after your wall as well as what it takes away.

1. Imagine the wall and recount both routes.This is the number you hope to gain.
2. Find the opponent's best wall against you.Recount again with that wall on the board. Does the wall you just imagined make it stronger?
3. Compare the totals.Only place the wall if you are still ahead after their best reply.
4. Do the same for them.Ask which of their walls become stronger once your wall is down.

Recognize When to Move Instead

A wall feels active, but a pawn step is free: it costs no wall and always makes progress. If you are winning the race, the right move is often just to move.

Here cyan needs 4 steps and white needs 5, with cyan to move. Count what each side can do:

• If cyan just steps forward, the count is 3 to 5 with white on the move. For white to turn the race around, a wall would have to add 3 steps to cyan's route. The best single wall on this board adds 1.
• If cyan places a wall that adds 1 step to white, the count is 4 to 6. Cyan was already winning, so that wall changed nothing and cost cyan one of its 10 walls.

A quick race check

Use the counts on your own turn, ignoring jumps and assuming no more walls:

The second row explains the previous section: cyan was one step behind (5 against 4) and needed a wall worth at least 2, so wall B (adds 3) was worth placing and wall A (adds 1) was not. In the race above, cyan leads by one step (4 against 5), so white would need a wall that adds 3 or more.

Moving can also be your defense. If your opponent has a wall that would add 3 steps to your route right in front of you, stepping past that spot removes the threat for free. Use the check above to decide whether a wall of your own is actually needed.

Common Beginner Mistakes

• Playing too defensively. Building a barrier across the middle feels safe, but a long row of walls also lies across your own path.
• Ignoring the opponent's route. Counting only your own steps hides the other half of the race. If you do not recount after each of their walls, you will not notice when you fall behind.
• Wasting walls on one-step detours. A wall that adds 1 step is worth 0 (see "Use Walls Efficiently") and permanently uses one of your 10.
• Hoarding all 10 walls. A wall never used is worth nothing once the game ends. Keep a couple in reserve, but spend them on walls worth 2 or more.
• Forgetting that walls are permanent. A wall that helps you now can cost you later if the game moves your pawn through that area.

The board above shows the first mistake. Four walls were placed end to end across the board, leaving only the far right column open. That adds 4 steps to white's route (6 to 10), which sounds like a lot. But the row lies across cyan's path too, so cyan's route also grows by 4 (7 to 11). Cyan spent four turns and 40% of its walls, and the race is exactly as close as it was before.

Advanced Quoridor Tactics

Keep a tempo ledger

Strong players think in counts: how many steps each side needs and who is on the move. Writing it down for a few turns makes the pattern clear. This is the position from "Use Walls Efficiently" a few moves later:

Cyan started a step behind and swung ahead with the gap-closing wall. At that moment no single wall adds more than 2 steps to cyan's route, so white's reply, which adds exactly 2, was the strongest one by count. The counts are now level with cyan on the move, which on its own would favor cyan.

Then stress-test your route

A level count is only half the picture. Ask what your opponent's best wall would add right now:

Cyan's route runs through a one-square-wide channel beside the board edge, and a channel has no alternative. A vertical wall next to the gap would add 7 steps to cyan's route and only 1 to white's. The same wall is worth even more once cyan has stepped into the channel (9 steps instead of 7). So the level count does not make cyan safe, and cyan's real question this turn is how to deal with that threat. Routes along the edge or between walls, yours or theirs, are where one wall costs the most, so check them first.

Take away the opponent's best wall

If one wall would hurt you badly, you can sometimes make it illegal instead of walking away from it. A wall that crosses or overlaps its only legal slot removes the threat for good.

In this position cyan relies on the middle gap, and white has no need of it. A horizontal wall there would add 3 steps to cyan's route. The gap is two columns wide between two walls, so the only wall that can close it is the one in the dashed position. Overlapping either neighbor is not allowed, and a vertical wall through its middle point crosses it. By placing that vertical wall, cyan has made the gap permanent. It costs a turn and a wall, so do it only when the gap is your lifeline and the threat is large.

Hold two or three walls for the finish

Tactics like the lone-gap squeeze need a wall in hand to carry out. A player who has used all 10 can only move, and cannot answer a late wall with a wall of their own. Spend early walls only when they are worth 2 or more, and keep a couple in reserve for the moment a gap appears.

Remember what the counts leave out

The counts above ignore pawns. When the pawns stand face to face, the player on the move can jump over the other pawn and cover two squares in one turn, so give a pawn that is about to jump an extra step of credit. The rules page explains jumps and sidesteps in full.

These are rules of thumb built from counting positions, not a proof of optimal play. Test them against real opponents.

Practice Against Different Opponents

Reading about counts is one thing, doing it every turn is another. The fastest way to improve is to play many games and make the count a habit. You can play against the computer at a level that suits you:

Three drills make the practice count:

1. Say both counts before every move."I need 6, they need 5." If you cannot say it, you cannot decide.
2. Predict the value of each wall.Work out what it adds to each route and subtract 1 before you place it. Aim for 2 or more.
3. Find the turning point after each game.Look for the first turn at which the lead changed hands, and ask what you could have counted differently.

Playing a friend on the same device is a good way to talk through counts out loud. Online opponents will also show you styles the computer does not: some wall early, some race.