Gambit

A gambit is a deliberate offer of material during the opening, most often one or more pawns. The player seeks compensation, meaning benefits that may balance the sacrifice. These may include rapid development, which brings pieces from their starting squares to useful positions, threats that force replies, central control, clear ranks, files, or diagonals for the pieces, more room to maneuver, or exposure of the enemy king.

The opponent may accept the material, decline it, or accept and return it later. Each choice changes the position. Trying to keep the extra pawn may consume time and allow the attacker to seize the initiative, meaning the ability to keep creating threats that demand replies; returning it at the right moment may complete development and reduce the pressure.

How it is evaluated

• The compensation must be concrete and last long enough to create threats or recover the material.
• Piece activity matters more than counting the pawn in isolation.
• The safety of both kings and the possibility of closing the lines may determine whether the gambit works.

A well-analyzed and tested gambit is considered sound when the compensation remains sufficient against accurate defense. Other gambits are dubious: they may pose practical problems but leave an objective disadvantage if the opponent responds correctly. Opening theory, the accumulated knowledge about early moves and their plans, examines these distinctions; winning one game does not prove that an offer is correct.

A countergambit answers the initiative with another material offer. A loss of tempo also matters because many gambits try to make the opponent spend moves capturing or defending material while the attacking side develops.