Source : 1ouk.com
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 starts again from scratch only if it is the last piece of one side in the game.
When neither side has any pawns left mate must be achieved in 64 moves. The one who is in disadvantage will be the one who will do the counting. He or she may stop counting whenever he or she favors. If the disadvantage side checkmates the advantage side and did not stop counting , the game will be declared a draw.
When the last piece that is not King of the disadvantage side is captured, the count restart from regular counting and the stronger side is now given a count value based on the pieces it has left:
At least two boats (Touk): 8 moves
At least boat (Touk): 16 moves
At least two pillars (Koul): 22 moves
At least one pillar (Koul): 44 moves
At least two horses (Ses): 32 moves
At least one horse (Ses): 64 moves
Only queens (Neang) left: 64 moves
From these starting values, subtract 1 for each piece on the board. The resulting number is how many moves the stronger side has to win, otherwise the game becomes a draw. Once the players have reached this point, there is no count restarts unless one side had stopped counting and would like to start counting again.
For example, if white has 2 boats (Touk) and 1 horse (Ses) against alone black king, he has 3 moves to checkmate his opponent (the given value of 8 minus the total number of pieces, 5). If black captures a white boat (Touk), the count does not restart.