A chess game isn’t one long, uniform river. It runs through three distinct phases, and each has its own rules, priorities, and traps. The beginner who plays the whole game the same way gets caught out; the one who knows which phase they’re in knows what to look for. Here’s the map of the terrain.

The opening: laying your foundations

The opening is the first ten to fifteen moves, the stretch where you bring out your pieces and stake out your position. It has a clear goal: to reach the middlegame with a healthy position, rather than to win right away.

Three things to do, and they’re the opening principles: occupy or control the center, develop your pieces toward active squares, and get your king to safety by castling. Do those three cleanly and you head into the rest in good shape, even without knowing much theory.

The trap of this phase is wanting to attack too soon with two pieces, or leaving your king in the center. The Italian Game is a good model of a clean opening: it applies the three principles in a few natural moves.

The middlegame: the heart of the battle

Once the pieces are out and the kings are safe, you enter the middlegame. It’s the richest phase, the one where most beginner games are decided, and the one where there’s no more theory to recite: you play with your understanding.

Here, two things matter above all. First, tactics: the forks, pins, skewers, and combinations that win material or deliver mate. The majority of games under 1500 Elo are settled on a tactic spotted or missed. Second, strategy: building a plan from your opponent’s weak points, from open files for your rooks, from the weakness of their king.

The useful reflex in this phase: before every move, check the threats. What the opponent threatens, and what you can threaten yourself. It’s by watching the tactical shots on both sides that you avoid disasters and seize your chances.

The endgame: when the queens fall silent

When only a few pieces are left on the board, often after the queens are traded, you enter the endgame. And here, surprise: the rules change almost completely.

The king, which you had to hide all through the start, becomes an active piece you need to march toward the center to help out. The pawns, quiet until now, become the stars: bringing them to promotion, that is turning them into queens, is often the whole point of the endgame. And the slightest extra pawn, insignificant in the middlegame, can be enough to win.

The endgame is played with precision rather than force. A few basic patterns, like mating with a rook or pushing a passed pawn, come up all the time and are worth knowing. It’s the phase beginners neglect most, and therefore the one where you gain the most points by putting in even a little work.

Why knowing the phases changes how you play

The point of this map is that it tells you what to look for at any moment. In the opening, you’re not hunting for mate, you’re developing. In the endgame, you no longer hide your king, you activate it. Playing an endgame move in the middle of the opening, or the reverse, is a constant source of errors for beginners.

Get the first phase right and the other two get easier, since a solid opening hands you a middlegame you can actually play rather than one you’re already digging out of. That’s where a tool like Prologue earns its place: it drills the opening until you cross it cleanly. For the rest, the guide to learning chess lays out what to work on, in order.

Frequently asked questions

Where does the opening end and the middlegame begin?

There’s no sharp border. Roughly, the opening ends when both sides have developed their pieces and castled: at that point there are no more “automatic” moves to play and the real battle starts. That’s the move into the middlegame.

Which phase should you work on first as a beginner?

The middlegame, and above all tactics, because that’s where most of your games are decided. Then basic endgames, very rewarding since few beginners know them. The opening supports the whole thing, but it isn’t enough on its own.

Can you win without ever reaching the endgame?

Of course. Many games end in a mate right in the middlegame, before any mass exchange. The endgame only arrives if the play evens out and the pieces thin down. But knowing how to play endgames saves you the close games that go all the way.

Do all three phases exist in every game?

No, not systematically. A decisive attack can mate in the opening or the middlegame, with no endgame at all. The three phases describe the typical arc of a balanced game, not an obligation.