![]() Fail low situations, a severe drop of the score may cause programs to allocate "panic time" to hopefully solve the critical situation.Prior a start of a new iteration, the relation of elapsed and allocated time (f.i.Only one obvious way to recapture in an otherwise quiet position.The ratio of the size of the subtree under the best move versus the size of the whole search tree.The score function over iterations and best moves, increase or decrease and/or oscillation, score amplitude, etc.How often did the best move change during the (last N) previous iterations?. ![]() A basic time management scheme might be enhanced in several ways, considering dynamic, statistical as well as static features of the search, the best move and its PV. Human chess players often wonder about the inflexible time management of various programs. It was for instance used during the late Aegon Tournaments. īronstein's time works similar, but never increases the remaining time. With Fischer time one may therefor increase the remaining time if one moves faster than the delay. In 1988 Bobby Fischer proposed an unconditional increment per move, no matter whether the delay was exhausted or not. Time trouble is also an issue in computer chess, either due to operators in over the board chess, boosted by deviation of internal and external clock, or in transmitting move transfer latencies in automatic play, where it is quite common nowadays to play with increment per move. It requires a special delay clock, which became handy with the development of digital chess clocks in the 70s and 80s. ![]() To avoid time trouble where often blunders decide the game, chess champions, most notable Bobby Fischer and David Bronstein, proposed a delay or increment of time for each move made. However, some time should be saved in order to have a buffer in case later moves warrant longer thinking times. We don't have to make estimations for how long the game will last. ![]() Regular time controls define a number of moves to be made in a fixed amount of time. Typically programs estimate the game will last further 25.40 moves, and divide the remaining time by this number. Sudden death refers to a requirement that all the remaining moves, rather than a fixed number of moves, need to be played within the remaining time. Fast chess is usually played with an immediate sudden death time control, while others may have one or more regular time controls before the sudden death control applies there as well. ![]()
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