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Japanese Byo-yomi
Keywords: Rules
Japanese Byoyomi is one of several time systems used for setting the limiting the period of time available to each player. Byoyomi as used on Go Servers is derived from the time system used in Japanese Title Matches. Perhaps it arose through a misunderstanding of the Japanese Title Match Time System.
On go servers, byoyomi is time added at the end of regular time allowance. This additional time consists comes in a number of units of a fixed duration. For example a game played at 25 minutes with 5 periods of 1 minute each. Once a player uses all of their regular time allowance they enter byoyomi. During byoyomi, each time that you make a move in less than 1 minute, your clock is reset to 1 minute of time remaining and the number of periods remains the same. If you always play within 1 minute, you can continue like this forever, always having 1 minute per move and 5 byo-yomi periods remaining. If you play 10 seconds into the 1 minute period, the clock is reset to 1 minute. The remaining 50 seconds are not accumulated, they simply disappear. Playing a move 10 seconds into a byoyomi time period is the same as playing that move 59 seconds into the byoyomi time period. It gets more interesting when you use more than 1 minute for a single move. If you use more than 1 minute and less that 2 minutes for a single move, you lose 1 byo-yomi period and the clock is reset to 1 minute of time remaining and 4 byo-yomi periods remaining. If you use more than 2 minutes and less than 3 minutes for a single move, you lose 2 byo-yomi periods and the clock is reset to 1 minute of time remaining and 3 byo-yomi periods remaining. The above procedure is repeated with each move for the player(s) in byoyomi till either the game is completed or one player uses up their remaining byoyomi periods without moving. For example: if there are 3 byoyomi periods of 1 minute each and the player does not play within 3 minutes, that player loses the game on time. Therefore, in the example above, once you enter byo-yomi you have 5 one minute periods that you can use how every you choose. You can use nearly 5 minutes for one move, at the cost of having to make every move from that point on within 1 minute. Or you can use less than 1 minute for every move, keeping time in reserve in case the game complicates and more reading time is needed. Authors: John F., Richard Hunter, Velobici This is a copy of the living page "Japanese Byo-yomi" at Sensei's Library. ![]() |