The name of this chess is made from initial letters of names of people which introduced an essential contribution in its creation. Carrera, Yasser Seirawan and Mats Winther. Drop variants of Chess were invented and implemented for example, by Andreas Kaufman (Descent Chess 2003, all pieces has to be dropped except for Kings and 2 pawns), by Gm.Yasser Seirawan (added 2 dropped extra pieces Hawk and Elephant for standard chess setup) in 2007, by Mats Winther (Alternative Chess) and many others. The Classical Carrera pieces was known already in the 17th century.
Carrera is also remembered as the inventor of chess variant (Carrera's chess) on an 8x10 chessboard, in which there were added two new pieces called the Champion (a combination of the moves of the tower/rook and the knight) and Centaurus (a combination of the bishop and the knight); these innovations had more fame than the ones made by Piacenza and Marinelli. It was a predecessor of Capablanca chess.
Hence, CSW chess is a variation (or hybrid) of Gm.Yasser Seirawan, Andreas Kaufman and Mats Winther (invented 2 extra pawns chess where are 2 extra pawns has to be dropped in second row and a pawn has to be move 2 steps ahead immediately) chesses with some new rules.

In this zrf.file:
I-Extra pieces you can drop any free square in the last rank in any time but, it is to be considered as 1 move.
II-Pawns has to be promote only to Classical chess pieces (not to extra dropped pieces).
III-Pawns can to drop on the free second row and it is to be considered as 1 move.

In this situation all of a great heritage classical chess will be unchanged. And the quantity of chess pieces are equal to the quantity of pawns = 10 (like of the Classical chess =8). The game is good balanced. The interesting fact: in this game:the relation of the general quantity of pieces(40) to quantity of squares of a chessboard(64);5/8=6.22;(5 and 8 are numbers of Fibonachi row)-it is approximately equal to a famous transcendental number `golden ratio` 0.618.
Also here introduced variation of Fisher random and Drop chesses, The Invisible Man chess and Amazons chess.