Tenjiku (exotic) shogi, is played on a 16x16 board with 176 pieces. This game is possibly the most complex tactical game in existence. There are many astoundingly powerful pieces, including one (the Fire Demon) that can capture up to eight opposing pieces in a single move! Despite the size of the game, checkmates can occur very suddenly (and often very early on) if one player makes a wrong move. (...taken from the GNU Shogi Manual)