Chef and Chetris

Chef has created his own game called Chetris and now he wants you to play this game. The rules of Chetris are very similar to a rather well-known game Tetris, but there are some subtle differences, so we recommend you to read the rules before start playing. Rules of the game: Tetrominos are game pieces — geometric shapes composed of four square blocks each. There are seven types of Tetrominos and