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  2. CuckooChess - Wikipedia

    en.wikipedia.org/wiki/Cuckoochess

    CuckooChess is an advanced free and open-source chess engine under the GNU General Public License written in Java by Peter Österlund. CuckooChess provides an own GUI, and optionally supports the Universal Chess Interface protocol for the use with external GUIs such as Arena.

  3. MTD(f) - Wikipedia

    en.wikipedia.org/wiki/MTD(f)

    In MTD(f), AlphaBeta fails high or low, returning a lower bound or an upper bound on the minimax value, respectively. Zero-window calls cause more cutoffs, but return less information - only a bound on the minimax value. To find the minimax value, MTD(f) calls AlphaBeta a number of times, converging towards it and eventually finding the exact ...

  4. Principal variation search - Wikipedia

    en.wikipedia.org/wiki/Principal_variation_search

    Principal variation search (sometimes equated with the practically identical NegaScout) is a negamax algorithm that can be faster than alpha–beta pruning.Like alpha–beta pruning, NegaScout is a directional search algorithm for computing the minimax value of a node in a tree.

  5. Variation (game tree) - Wikipedia

    en.wikipedia.org/wiki/Variation_(game_tree)

    Although the term is most commonly used in the context of Chess analysis, it has been applied to other games. It also is a useful term used when describing computer tree-search algorithms (for example minimax) for playing games such as Go [1] or Chess. A variation can be any number of steps as long as each step would be legal if it were to be ...

  6. Glossary of computer chess terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_computer_chess...

    In the minimax search algorithm, the minimum value that the side to move can achieve according to the variations that have been evaluated so far. alpha–beta pruning An algorithm that reduces the number of nodes searched by the minimax algorithm. This refinement is essential to make it practical to search large game trees such as those in chess.

  7. Alpha–beta pruning - Wikipedia

    en.wikipedia.org/wiki/Alpha–beta_pruning

    Alpha–beta pruning is a search algorithm that seeks to decrease the number of nodes that are evaluated by the minimax algorithm in its search tree. It is an adversarial search algorithm used commonly for machine playing of two-player combinatorial games (Tic-tac-toe, Chess, Connect 4, etc.). It stops evaluating a move when at least one ...

  8. Negamax - Wikipedia

    en.wikipedia.org/wiki/Negamax

    Negamax scores match minimax scores for nodes where player A is about to play, and where player A is the maximizing player in the minimax equivalent. Negamax always searches for the maximum value for all its nodes. Hence for player B nodes, the minimax score is a negation of its negamax score.

  9. Expectiminimax - Wikipedia

    en.wikipedia.org/wiki/Expectiminimax

    Bruce Ballard was the first to develop a technique, called *-minimax, that enables alpha-beta pruning in expectiminimax trees. [3] [4] The problem with integrating alpha-beta pruning into the expectiminimax algorithm is that the scores of a chance node's children may exceed the alpha or beta bound of its parent, even if the weighted value of each child does not.