Many grandmasters used psychological techniques that can hardly be considered correct.
You can secure your victory without even touching the pieces. One of the scandalous cases in the history of chess occurred in 1937. Then, at the Ukrainian SSR Championship, Yefim Korchmar locked his partner, Yevsey Polyak, in the restroom. As a result, Korchmar got a victory point, and he became one of the winners of the championship.
Another common trick is being late for the game. It was practiced by almost all well-known grandmasters Continue reading