Nim variants with six different boards and fifteen counters. Players take turns to remove one or two adjacent counters that must be joined by a black line. The player who is forced to take the last counter loses the game. Variant 1: players take turns to remove at least one counter or at most a row of counters provided there is no missing counters in between. Variant 2: players take turns to remove from one to three adjacent counters with no missing counters in between, but a players must not take the same number of counters as the previous player.