it is the b- or h-pawn, or to play 3...Qe4+ followed by a sacrifice if it is the c-pawn. Checkmate on a particular square: This may mean either that the odds-receiver's king must be mated while on the specified square, or that the odds-giver's piece must administer mate from that square. Carrera considered the first of these roughly equivalent to knight odds, the second a bit less. Assiac observed of the first, "This sounds like a formidable proposition, but it really isn't. All the better player has to do is reduce the game to a favorable ending. Thereafter, having promoted a pawn or two, he will find the rest easy." Checkmate with a pawn: The mating pawn may be any pawn, not a specified pawn, as in pion coiffé. Carrera considered this form of odds equivalent to giving odds of two pawns. Giving all the pieces for two moves each time: The odds-giver begins the game with only the king and pawns, while the odds-receiver has a full complement of pieces and pawns. In exchange for this, the odds-giver plays two moves on each turn, while the odds-receiver can only play one. Carrera wrote that while some considered this an even game, he thought that it favored the pieces, although the side with the pieces must play cautiously. The player with the pieces should try to eliminate the pawns, for instance by giving up two pawns for one, or a minor piece for two pawns. This is also called Monster chess (which usually uses 4 pawns). Giving the king the knight's move: The odds-receiver's king, in addition to being able to move in the usual manner, is able to move like a knight. Carrera considered this form of odds improper because it allows the odds-receiver to use his king to checkmate the enemy king from a knight's move away (for example, with the odds-receiver's king at g6 and the odds-giver's king at h8, the latter is in check and, if no legal response is possible, is checkmated). Carrera considered this form of odds equivalent to giving rook and pawn odds. Because of the king's unusual power, the odds-giver requires more material than usual in order to checkmate a bare king (for example, queen and another piece, or two rooks). Giving the queen the knight's move: Similarly to the above, the odds-receiver's queen (rather than king) has the additional ability to