Premove

In online chess, a premove is a move input made by a player during their opponent's turn, taking effect only after the opponent moves. A premove is performed in the same way as a normal move, most commonly by dragging the piece to its destination, or by clicking the piece and then clicking its destination.

Premoving is available on chess websites such as the Internet Chess Club, the Free Internet Chess Server, Chess.com, and Lichess.

The Internet Chess Club allows players to block any players with premoving enabled.[1]

Description

To premove, a player makes a move input in the same way as they would if it were their turn. After their opponent moves, the premove is immediately executed, provided that the resulting move is legal; otherwise, the premove is discarded. One can cancel a premove by clicking anywhere on the board; if only one premove is allowed at a time, then one can also cancel a premove by making another premove.

Some websites, such as Chess.com, offer the option of making multiple premoves at a time. Each premove is executed in sequence if possible; however, if any premove fails to be executed, then it and all subsequent premoves in the sequence are cancelled.

Lichess offers the options to input moves with the keyboard and with one's voice; premoving is supported in these modes.

Strategy

Premoving is used both recreationally and to avoid letting one's clock run out. Generally, it is only done when either the move would be good in any subsequent position where it is valid or the player is in time trouble. It is most often used when anticipating a capture by an opponent so as to recapture the capturing piece. Premoves can be risky if the opponent anticipates it and/or does something unexpected, as in the Rosen Trap.[2]

References
  1. ICC website, formula
  2. "The Rosen Trap in Action". chess.com. Retrieved 12 April 2023.
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