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The blindfold games are played using computers, an empty chessboard
displayed on each player's screen. After a player moves using mouse or
keyboard, the move appears on both screens instantaneously during
fractions of seconds. Then the opponent's clock starts and the move
disappears from the screens. Moves are transmitted to monitors hidden from
the players where the arbiter and spectators can follow the game. Total
time is 25 minutes, plus 20 seconds added in each move per player. And
about the use of the virtual board for analysis, it is not estrictly
forbidden, but it seems inutile, it is a blind analysis with only an empty
board in front of the player.