Squares may slide horizontally or verically through any number of contiguous emtpy spaces, including around corners. A square cannot be slid back to the same position it occupied before the most recent turn by the opponent. For example, if your opponent slides the square at a2 into the empty space at b2, you may not slide it back to a2 on the following turn. You must wait a turn before you may do so, or if there was another empty space nearby, such as at b3, you could slide it to there. Pawn Promotion Pawns promote when they reach the last non-empty space which exists in their column.
Pawns always promote at the end of the turn of the player who owns the pawn.
This means that a pawn does not promote if it moves to a promotable position and then slides to a non-promotable position in the same move. It also applies to the rare event when you slide a square out from in front of one of your opponent's pawns, placing it in a promotable position. In this case the pawn does not promote until the end of the opponent's next move. It is possible to set up a position in Amoeba where 3 pawns can promote in the same turn. On the -small board, pawns may promote to rook, knight, or bishop, but NOT to a queen.