Makruk ), or Thai chess, is a board game that descended from the 6th-century Indian game of chaturanga or a close relative thereof, and therefore related to chess. It is regarded as a chess variant. The word "ruk" in Thai is thought to derive from "rukh" which means "chariot" in the Persian language. The Persian traders came to the Ayutthaya kingdom around the 14th century to spread their culture and to trade with the Thai kingdom. It is therefore possible that the Siamese Makruk, in its present form, was directly derived from the Persian game of Shatranj via the cultural exchange between the two people in this period. This is because the movement of Makruk Thai's queen, or the "seed", is essentially the same as Ferz in Shatranj.
Rules
Pieces
The pawn moves and captures like a pawn in western chess, but cannot move two steps on the first move and, therefore, cannot be captured en passant. A pawn that reaches the sixth rank is always promoted ' by flipping it over, and then it moves like a queen '.
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The queen, arguably the weakest piece, moves one step in any diagonal direction, like the ferz in shatranj, or a cat sword in dai shogi.
The knight moves like a knight in western chess: two steps in one direction and then one step perpendicular to that movement. It jumps over any pieces in the way.
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The rook moves like a rook in western chess: any number of steps horizontally or vertically.
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The king moves like a king in western chess - one step in any direction. The game ends when the king is checkmated. Unlike shatranj, the game ends as a draw if the king is stalemated.
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In starting position, pawns are placed on the third and sixth ranks. Queens are placed at the right side of kings. Pawns promote to (เบี้ยหงาย bia ngai, overturned cowrie shells, and move like queens when they reach the sixth rank.
Counting rules
When neither side has any pawns, the game must be completed within a certain number of moves or it is declared a draw. When a piece is captured the count restarts only if it is the last piece of a player in the game.
When neither player has any pawns left, mate must be achieved in 64 moves. The disadvantaged player counts, and may at any time choose to stop counting. If the disadvantaged player checkmates the advantage side and did not stop counting, the game is declared a draw.
When the last piece of the disadvantaged player is captured, the count may be started, or restarted from the aforementioned counting, by the weaker player, and the stronger player now has a maximum number of moves based on the pieces left:
If there are two rooks left: 8 moves
If there is one rook left: 16 moves
If there are no rooks left, but there are two bishops: 22 moves
If there are no rooks or bishops left, but there are two knights: 32 moves
If there are no rooks left, but there is one bishop: 44 moves
If there are no rooks or bishops left, but there is one knight: 64 moves
If there are no rooks, bishops or knights left, but only queens: 64 moves
The disadvantaged player announces the counting of his fleeing moves, starting from the number of pieces left on the board, including both kings. The winning player has to checkmate his opponent's king before the maximum number is announced, otherwise the game is declared a draw. During this process, the count may restart if the counting player would like to stop and start counting again. For example, if White has two rooks and a knight against a lone black king, he has three moves to checkmate his opponent. If Black captures a white rook, the count does not automatically restart, unless Black is willing to do so, at his own disadvantage. However, many players do not understand this and restart the counting while fleeing the king.
Variants
There are rules which do not apply to the standard, formal game, or have been abandoned in professional play. They are called sutras. The first free moves are similar to those in Cambodian Ouk.
Sut Khun สูตรขุน can be compared to the castling rule in international chess. The rule allows the player to move the King to a blank square on next row, like a Knight, so long as the king has never moved.
Sut Met สูตรเม็ด is the most popular sutra in informal rules. It is a first free move that allows the player to move the Queen and the Pawn in front of the Queen at the same time. Two pieces are moved in this sutra. First, move the Pawn in front of the Queen forward; then move the Queen to the blank square the pawn has just vacated, so the Queen moves two squares.
Sut Ma สูตรม้า is a first free move that allows the player to move a Knight and a Pawn a Knight's move from that Knight in the same turn. Two pieces are moved in this sutra. First, move the Pawn which is a Knight's move from the Knight forward; then move the Knight to the blank square the Pawn has just vacated.
Takhaeng Ruea ตะแคงเรือ Turn one or both Boat pieces upside down. This changes the Boat to be a Bia Ngai. This reduces the power of one or two Rooks.
Cambodian chess
The variety of chess played in Cambodia, called "Ok" or "Ouk Chatrang", is virtually identical to makruk, with a couple of minor differences. If no pieces have been captured, the players have the options
on the king's first move, and only if not in check, of moving the king like a knight; and
