Ouk Chaktrang

Last Updated:
2023-08-21
Captured:
2020-03-01 ~ 2022-07-30
Kampong Luong, Ponhea Lueu, Kandal, Cambodia Cambodia flag

Ouk Chanktrang, often referred to as simply “Ouk”, is a Khmer strategy game derived from the Indian game Chaturanga, generally considered to be the origin of modern chess, between 7th and 12th century CE. Watch the video Creative In Battle to learn more.

Bas relief at Bayon temple depicting game of ouk chaktrang - late 12th century

Whilst the board and number of pieces are the same as in chess, Ouk has a different starting position of pieces, and the movement of several pieces is different. There are also a variety of event-based rules that are unique to Ouk.

Name meaning

As explained to me by ex-Buddhist monk, Samoeurn Sin, Ouk Chaktrang has a very literal meaning with regard to aspects of the game. "Ouk" is from Khmer and "Chaktrang" is from the Bali-Sanskrit language.

"Ouk" means to slam down and kill on the spot, it is also the word used to alert an opposing player when their king is in a position to be taken in the next move.

"Chaktrang" comes from "cha-to-rong-kek" meaning the king leading with four forces; the navy has a boat, the army consisted of horses, elephants, and humans.

Board, Pieces, Position and Movement

The board is a grid of 8x8 squares and each player has 16 pieces to start. The first row of pieces reading left to right are:

| touk | ses | koul | neang | khon | koul | ses | touk |

The second row is empty, differing from the chess starting position, and the third row is a line of eight:

| trey | trey | trey | trey | trey | trey | trey | trey |

Ouk Chaktrang starting position

Touk (boat) x 2

Touk boats in this context represent war canoes that were dug out from s korki tree, blessed by monks, and held typically between 20 and 40 oarsmen. They are difficult to manoeuvre, so often take a very straight course. You can see more about these war vessels from the annual Bon Om Touk festival.

Bas relief of Khmer armed canoe warriors - Bayon temple 12th century

The 2 touk pieces have their starting positions at the extremities of the board, far left and far right. They move in straight cardinal lines N, E, S, W as many squares as they like or until they take an opponent’s piece. They can not move in the diagonal. Effectively the same as the rook in chess.

Touk (boat) piece for Rek and Ouk Chaktrang games

Ses (horse) x 2

The 2 ses horse pieces represent the Khmer cavalry, though Khmer armies had more war elephants than horses.

Bas relief of Khmer mounted cavalry returning from battle - Bayon temple 12th century

The ses starting position is one square inside that of the touk, and just like the knight chess piece it moves in an ‘L’ shape 1x3 or 3x1 squares in any direction.

Ses (Horse) piece for Rek and Ouk Chaktrang games

Koul (colonel) x 2

The 2 koul pieces represent battlefield commanders, most likely mounted on war elephants and accompanied by soldiers baring crossbow type weapons.

Bas relief of war elephant mounted by Khmer commander and soldier - Bayon temple 12th century

Their starting position is one square inside from each of the ses pieces. Their movement is unique to Ouk, not found in chess, in that they can move 1 square NW, N, NE, SW and SE, they cannot move along the cardinals W, E and S.

Koul (Colonel) piece for Rek and Ouk Chaktrang games

Met or Neang (queen) x 1

There is only 1 neang and she probably also rode a war elephant for its apparent security and accompanying soldier defences.

Bas relief of queen Indradevi or Jayarajadevi in corner of Bayon temple inner hall

Consequently, her movement is much restricted to 1 square in the diagonals NW, NE, SE and SW.

Note: In the neang’s first move she may move 2 squares north.

Met or Neang (Queen) piece for Rek and Ouk Chaktrang games

Ang or Khon (king) x 1

There is only 1 khon and he also probably rode a war elephant. Whilst his movement is also limited to 1 square per turn, he can move in all directions, N, NE, E, SE, S, SW, W and NW.

Bas relief of Khmer king (khon) - Bayon temple 12th century

Note: In the khon’s first move, and only if being targeted in an Ouk position, the khon may move like a khoul.

Ang or Khon (King) piece for Rek and Ouk Chaktrang games

Trey (fish [soldier]) x 8

Last, but by no means least, there are 8 trey representing the infantry of the battlefield. Perhaps they were called fish as in the saying

“They’re like fish on a chopping board”,

meaning their destiny was for no more than to have their heads chopped off for nourishment of others.

Bas relief of Khmer infantry - Bayon temple 12th century

These pieces can only move north 1 space at a time, just as pawns do in chess. However, if they are fortunate enough to reach the 6th row, the piece is flipped onto its back, earning a promotion to “trey bork” and can now move as the neang, NW, NE, SE, SW improving chances of survival considerably.

Trey (Fish) piece for Rek and Ouk Chaktrang games

Objective & Advanced rules

The objective is as required in most variations of chess, to take or trap the king.

To help put a little pressure into more closely matched games some additional limitations are presented:

  1. When players have no pawns left, trapping the khon must be achieved in 64 moves. If the losing player traps the opponent, the game is a draw.
  2. When the last piece of the losing player is captured, that is not the khon, the count may be started, or restarted from the aforementioned counting, and the winning player now has a maximum number of moves left to win based on the remaining pieces:
  • 2 touk = 8 moves
  • 1 touk = 16 moves
  • 0 touk + 2 koul = 22 moves
  • 0 touk + 0 koul + 2 ses = 32 moves
  • 0 touk + 1 koul = 44 moves
  • 0 touk + 0 koul + 1 ses = 64 moves
  • 0 touk + 0 koul + 0 ses + 1 neang = 64 moves

The losing player counts his moves, starting from the number of pieces left on the board, including both khons. The winning player must trap the opponent's khon before the maximum number is reached, else the game is a draw.

Emotional control

Anyone who has played such a game for long enough will come to appreciate the benefits of having a superior control over emotions. To succeed at Ouk players must learn not to make hasty decisions based on emotion. The desire to attack or retaliate impetuously will overcome reason and a more calculated approach, thus lowering a player’s chances of survival in this game of strategy.

Creative ideas

When players realise that their chances of survival are much increased through control of emotions, they can then begin to enjoy the experimentation of the mind. The ability to imagine future moves and possible responses from the opposing player is the start of a creative process that can help develop an individual's propensity to making more creative choices for life in general.

Khmer culture

Whilst the origins of Ouk probably came to the Khmer empire along with external Hindu and Buddhist influences anywhere between 7th and 12th century CE.

The original game from India was known as Chaturanga, from the Sanskrit language, and thus “Chaktrang” bares some similarity inheriting syllables from the original name.

The Khmer adapted the game to suit their own preferences in play such as the word “Ouk” which is often shouted quite loudly as an attacking piece is slammed onto the board. Beyond this it is difficult to place any particular cultural association with the game.

However, after experiencing more than 3 years living in Cambodia it must be one of the more peaceful lands I have visited and with people who are generally calm, courteous and civil. You can’t help but see a correlation between the serenity of Ouk and this peaceful society. Whilst the game Ouk had fallen in popularity for some time it is now on the rise again and appears as an official sport in the SEA (South East Asia games).

Culture: Khmer
Era: 700 CE ~ present
Properties: StrategyMemoryDeep learningCharacter analysisTacticsEmotional controlCreative ideas
Components: Board of 8x8 squares32 pieces

Author

Tim Jules Hull
Games Explorer

Tim is a computer games developer turned games explorer, documenting indigenous games and sports as he travels around the world via motorcycle.