Combinations and Sacrifices

Forced sequences and the deliberate surrender of material.

A combination is a forcing sequence of moves, usually involving a sacrifice, that produces a clear advantage at its conclusion. Combinations are how tactical motifs are converted into results on the board. A successful combination may win material, deliver mate, or force a favourable endgame.

A sacrifice is the deliberate surrender of material for a non-material gain — greater activity, an attack on the king, a positional advantage, or a forced mating sequence. Sacrifices are classified by the nature of the compensation.

Real sacrifice

A sacrifice whose outcome cannot be calculated to a forced conclusion. The sacrificer may remain material down for some time and relies on dynamic or positional compensation, assessed by judgement rather than variation. The real and sham categories were distinguished by Rudolf Spielmann in The Art of Sacrifice in Chess (1935).

Positional sacrifice

A form of real sacrifice in which material is given up for a long-term advantage: a better pawn structure, an exposed enemy king, control of a key square, or the restriction of an opposing piece. The return is not forced, and the assessment rests on positional judgement rather than calculation. A full entry for the positional sacrifice is kept in the chess terms glossary.

Sham sacrifice

A sham sacrifice is one whose compensation is concrete and can be calculated — a forced mate, a winning attack, or the immediate recovery of the material with interest. The defender has no satisfactory reply.

Exchange sacrifice

A rook is given for a minor piece (bishop or knight). The usual return is a strong outpost for the remaining minor pieces, a dominant bishop, or the destruction of the opposing pawn structure. Tigran Petrosian's games are the standard reference for the positional exchange sacrifice.

Calculation

Combinations are found by the disciplined application of the basic tactical motifs — pins, forks, discovered attacks, and the rest — linked by forcing moves. A forcing move is one the opponent must answer in a specific way: checks, captures, and direct threats. A calculation exercise consists of listing the candidate forcing moves, following each to a reasonable conclusion, and choosing the one that produces the best result.