The Mighty Duel: 7 by 7 Kingdomino for Two

The original rulebook introduces the Mighty Duel as the game for real champions, after a practice game or two. The 2024 edition goes further and makes it the two-player rule. It is the deepest way to play Kingdomino: two players, all 48 dominoes, and kingdoms of 7 by 7.

The rules

Everything works as in the base game, with these changes:

• Each player takes two kings of their color.
• Use all 48 dominoes. Nothing is set aside.
• Lay out four dominoes per line.
• Each round, each player places and picks twice, once for each king, in line order.
• Build a 7 by 7 kingdom instead of a 5 by 5. The castle is still one square, so each player places 24 dominoes: 48 squares plus the castle make 49.
• The game runs 12 rounds.

The 2024 rulebook adds a setup detail for the first line. One king is drawn at random. Its owner, player A, chooses one of the four dominoes. Then player B chooses two. Player A takes the last one. The original rulebook simply uses the normal random king draw.

Scoring is unchanged: squares times crowns, territory by territory, with the same tiebreakers. You may add Middle Kingdom (castle in the center of the 7 by 7) and Harmony (a complete 7 by 7 with no discards) just as in the base game.

Nothing is hidden but the order

With all 48 dominoes in play and only two players, every domino ends up in your kingdom or your rival’s. That has big consequences:

• You can count everything. Lesson 6’s counts are exact: 39 crowns in all, 10 of them on 6 mine squares. Everything you have not seen is still coming.
• Every crown is a zero-sum crown. A crown you take is one your rival does not get, and the reverse. Denial and value are two sides of the same pick.
• Rare terrains decide games. All six mine dominoes and all ten swamp squares come out. One player usually ends up with most of the mines. Make sure it is a fight, not a gift.

Bigger territories, bigger numbers

A 7 by 7 holds nearly twice the squares of a 5 by 5, so territories grow much larger. A 14-square forest with 4 crowns scores 56 on its own. Lesson 4’s rule that one big territory beats two smaller ones matters even more here, because there is room to build one.

Good duel kingdoms often look like this: one very large common territory (forest, lake, or wheat) with every crown of that terrain you can grab, plus one or two rich small territories (mines and swamps) packed with crowns.

Splitting your kings

You make two picks every round, and their positions set your two places in the next turn order. Lesson 10’s idea carries over: decide each round how to split your kings between front and back.

• Front and back is the balanced play: one strong domino now, one early pick next round.
• Both back grabs two rich dominoes now and gives your rival the first two picks next round.
• Both front is for rounds when you know a prize is still to come, and you want the first choice of the next line.

Because you can count every domino left, you can judge how likely the next line is to hold a prize.

The 7 by 7 layout math

The checkerboard check from lesson 7 works here too. Color a 7 by 7 like a checkerboard with dark corners: 25 dark squares and 24 light. Twenty-four dominoes cover 24 of each, so the castle must end on a dark square for the kingdom to be complete. Number the rows and columns 1 to 7: a light square is any square whose row and column numbers add up to an odd number. The corners and the center are dark, so either is a safe home for the castle.

A simpler habit: if you want Harmony, fix your frame by the midgame and keep the empty area in pairs, exactly as in the 5 by 5.

Practice ideas

• Play it on Board Game Arena, which offers the Mighty Duel as an option, to get many games in quickly.
• Track the rich dominoes with a tick list until you do it in your head.
• Review your mines. After each game, count the mine crowns each player ended with. If you lost that count, ask which pick gave it away.

Some tournaments use the Mighty Duel for their two-player tables. Lesson 13 covers where to find them.