classical chess

Noun

 * 1)  Chess played at a slow time control, with games taking up to several hours (the most common format at professional tournaments).

Usage notes

 * The exact boundaries of classical and rapid chess are somewhat ill-defined, with some chess websites considering a game to be "classical" with as little as thirty minutes per side with no increment. This range of time controls is generally referred to as "slow rapid" by the professional chess community.