Shove Five Strategy: Pushes, Blockers and the Backfire Rule

Updated October 2026

Shove Five is a five-in-a-row duel in which nothing is ever placed and nothing is ever removed. Every turn takes one cube from the rim of a 5×5 board and slides it back in somewhere else, dragging a row or column along with it. That single mechanic means your move always changes the opponent's position as well as your own. This guide explains exactly what a push does, how the computer opponent judges the board, and which habits keep a win streak alive as it starts looking deeper.

What a push really does

You play X and always move first; the computer plays O. On your turn you may pick any of the 16 rim cubes that is blank or already carries your X. Cubes showing O are off limits. Arrows then appear for each end of the row or column where the cube may re-enter. You can never send it back out the side it is already on, so a corner cube has two choices and any other rim cube has three. That makes 44 possible moves on an empty board.

When you choose an arrow, the picked cube leaves its square, every cube between that gap and the chosen end slides one step to close it, and your cube drops in at that end showing X. Two consequences are easy to overlook:

• Not every push moves a whole line. Taking a cube from the middle of the top edge and sending it along the top row only shifts the cubes between it and the corner. Sending it down through the column moves all five squares of that column.
• Your cube always ends up on the rim. A new X never lands in the interior directly. Inner squares only change when a whole row or column is shoved through them.

Winning, losing and the backfire rule

There are twelve winning lines: five rows, five columns and the two long diagonals. After every push the game checks both sides, and it checks the side that did not move first. If your push lines up five O's, the computer wins, even if the same push also completes five X's. So a push that wins for you and accidentally finishes the opponent's line is a loss.

If a game reaches 90 moves in total, 45 for each side, it is declared a draw. A draw ends your streak just like a loss: the result card offers New instead of Next game, and you start again from zero.

Squares that matter more than others

Not all squares are equal. Count the lines through each one:

• The centre sits on four lines: its row, its column and both diagonals.
• Each corner sits on three: a row, a column and a diagonal.
• The other rim squares sit on only two.

Corners are also where your pushes can reach most directly, since every X you add lands on the rim. Diagonals are harder to complete because their middle three squares are interior, and each of those changes only when a full line passes through it. In practice most games are decided on rows and columns near the edges, while diagonals are a source of sudden surprises when a long shove happens to line them up.

How the computer thinks

The opponent scores a position by looking at all twelve lines. A line that holds only O's is good for it, and the value climbs steeply with the count: 1, 10, 120 and 1,500 for one to four O's. A line with only X's counts against it in the same way. A line containing both marks counts for nothing at all.

Two practical lessons follow. First, a single X pushed into a line full of O's makes that line worthless in the computer's eyes, which is often the cheapest defence available. Second, the computer chooses randomly among moves it rates equally, so the same opening will not always get the same reply.

Its search depth depends on your streak. At a streak of 0 or 1 it only looks at the position right after its own move and does not consider your answer. At 2 or 3 it also considers your reply. From a streak of 4 onward it looks three moves deep and never goes deeper. It pauses briefly before each move, so watch the board settle rather than tapping ahead.

Evicting a blocker

The most useful tactic in the game comes straight from the push mechanic. When the computer blocks your line, its O usually arrives at an end square of that line, because that is where pushed cubes enter. Look at the perpendicular line through that square. If you take a usable cube from the far end of that perpendicular line and push it in at your line's end, the O slides one step along the perpendicular, out of your line, and your X takes its place.

Against the shallowest opponent this pattern is decisive. In our simulation, a player who simply chose the move that looked best one step ahead won all 100 games against the streak-0 opponent, every one in exactly five moves. In the games we traced, the winning plan was this one: shove each blocker sideways and refill the gap. Be aware that the evicted O's pile up in the perpendicular line, so check that column or row before each eviction.

Defending as the search deepens

Once the opponent looks two and three moves ahead, the easy wins disappear. In our simulation, a two-step player against the two-step opponent won 11 of 100 games, lost 6 and drew the rest. A three-step player against the strongest setting won 14 of 40 and lost none, with most other games drawn. From here on your streak depends on not losing while still turning games into wins, because a draw ends it too.

1. Check both ends before every push. Look at what enters your line and at what slides along. A shove that moves three of your X's can also shift three O's into a new alignment.
2. Treat four O's as untouchable. Any push through a line that already has four O's must break it apart, or it may finish the line for the computer.
3. Do not strip your own lines. Taking one of your X cubes off the rim removes it from every line it was part of. Prefer blank cubes when you can.
4. Use mixed lines as shields. One well-placed X kills a whole line from the computer's point of view, and it stays dead until that X is shoved out.
5. A draw is no rescue. Reaching the 90-move limit ends your streak just as a loss does, so safe, quiet pushes only delay the reset. Defend first, but keep looking for the shove that turns the game into a win.

Your score and the Hall of Fame

Your score is the number of games won in a row; a draw or a loss resets it. The best streak is saved on your device, and any streak above zero can be posted to the Hall of Fame from the result card. Since the opponent stops getting deeper at a streak of 4 but a draw no longer protects the streak, long runs come from careful defence that still converts games into wins.