A fork attacks two pieces at once so neither can be saved. A pin stops a piece from moving because something more valuable stands behind it. A skewer is a pin in reverse, attacking the valuable piece first so it must move and expose the one behind. Together these patterns account for most tactical wins.
Tactics are not luck. They are recognisable patterns, and the reason strong players find them faster is that they have seen the shapes thousands of times. Three patterns do most of the work.
The fork: attack two things at once
A fork is a single move that attacks two or more enemy pieces, so the opponent can only save one. Any piece can fork, but the knight is the specialist because its unusual movement makes the double attack hard to see.
- A knight fork on a square that hits both the king and a rook is a classic game-winner.
- A pawn fork is especially effective because a pawn is worth so little that trading it for a knight or bishop is a clear gain.
- The queen forks constantly, but she is also easily chased, so queen forks must be checked for a reply.
- The commonest fork in practice is the one that wins a rook by also giving check, because the check forces the king to move first.
Forks are rarely played cold. They are prepared, usually by a check or a threat that forces the defender's pieces onto the squares where they can be hit.
The pin: a piece that cannot move
A pin constrains a piece because something more valuable sits behind it. A bishop on b5 pinning a knight against the king is an absolute pin, and the knight may not legally move at all. A pin against a queen or rook is relative, and the pinned piece can move if it chooses to accept the loss.
Pins are strong because they are not a one-move trick. The pinned piece is effectively frozen for as long as the pin lasts, which means you can attack it repeatedly while the defender can only add more defenders.
The skewer: the pin reversed
A skewer attacks a valuable piece with a less valuable one, so the valuable piece must move and expose whatever stands behind it. The classic is a rook or bishop checking the king, and when the king steps aside, capturing whatever was behind it.
| Pattern | Order of attack | Result |
|---|---|---|
| Pin | Less valuable in front, more valuable behind | Front piece is frozen |
| Skewer | More valuable in front, less valuable behind | Front piece must move, exposing the rear |
| Fork | One piece attacks two or more at once | Opponent can save only one |
Discovered attacks
A discovered attack happens when moving one piece unleashes a second piece behind it. The moving piece can create its own threat while the piece behind gives check or wins material, and the defender usually cannot answer both.
A discovered check is the sharpest version, because the check forces a response while the moving piece is free to do damage. This is the mechanism behind many decisive combinations, and it is the reason lines and alignments matter even when no tactic is visible yet.
How to find tactics reliably
- Look at every check, every capture and every threat. Most tactics begin with a forcing move.
- Find the enemy king and count the pieces that could reach squares near it.
- Look for aligned pieces. Pins, skewers and discovered attacks all need pieces on the same line.
- Check undefended pieces. A piece that is defended by nothing is a candidate for a fork.
- Look for overloaded defenders, pieces defending two things at once.