Depth-First

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Depth-First refers to node traversal algorithms of tree like data structures like search trees. Depth-first examines child nodes before siblings and can easily implemented with recursion using a stack of nodes. It therefor has moderate memory requirements, since only one path from the root to a leaf is kept in memory, which grows proportional with search depth.

=Depth-Limited Search=

The depth-limited search, to make the depth-first search find a solution within the depth limit, is the most common search algorithm in computer chess, as described in minimax, alpha-beta and its enhancements. Iterative deepening is a state space search strategy in which a depth-limited search is run repeatedly, with a cumulative node order effectively breadth-first.

=See also=
 * Alpha-Beta
 * Backtracking
 * Best-First
 * Depth
 * Iterative Deepening
 * Minimax
 * Proof-Number Search

=Publications=

1985 ...

 * Richard Korf (1985). Depth-first Iterative-Deepening: An Optimal Admissible Tree Search. pdf from CiteSeerX
 * Stephen F. Wheeler (1985). A performance benchmark of the alpha-beta procedure on randomly ordered non-uniform depth-first game-trees generated by a chess program. M.Sc. thesis, East Texas State University
 * Hermann Kaindl, Helmut Horacek, Marcus Wagner (1986). Selective Search versus Brute Force. ICCA Journal, Vol. 9, No. 3

1990 ...

 * Steven Skiena (1990). Breadth-First and Depth-First Search. §3.2.5 in Implementing Discrete Mathematics: Combinatorics and Graph Theory with Mathematica. Reading, MA: Addison-Wesley, pp. 95-97,
 * Nageshwara Rao Vempaty, Vipin Kumar, Richard Korf (1991). Depth-First vs Best-First Search. AAAI-91, pdf
 * Weixiong Zhang, Richard Korf (1993). Depth-first vs. best-first search: New results. AAAI-93
 * Matthew L. Ginsberg (1993). Essentials of artificial intelligence. Morgan Kaufmann Publishers, 3.2 Depth-First Search
 * Ayumu Nagai, Hiroshi Imai (1999). Proof for the Equivalence Between Some Best-First Algorithms and Depth-First Algorithms for AND/OR Trees. Proceedings of the Korea-Japan Joint Workshop on Algorithms and Computation

2000 ...

 * Ayumu Nagai, Hiroshi Imai (2002). Proof for the Equivalence Between Some Best-First Algorithms and Depth-First Algorithms for AND/OR Trees. IEICE transactions on information and systems

2010 ...

 * Tomoyuki Kaneko (2010). Parallel Depth First Proof Number Search. AAAI-2010 » Parallel Search, Proof-Number Search
 * Kunihito Hoki, Tomoyuki Kaneko, Akihiro Kishimoto, Takeshi Ito (2013). Parallel Dovetailing and its Application to Depth-First Proof-Number Search. ICGA Journal, Vol. 36, No. 1
 * Tom Everitt, Marcus Hutter (2015). Analytical Results on the BFS vs. DFS Algorithm Selection Problem. Part I: Tree Search. Australasian Conference on Artificial Intelligence, pdf
 * Tom Everitt, Marcus Hutter (2015). Analytical Results on the BFS vs. DFS Algorithm Selection Problem: Part II: Graph Search. Australasian Conference on Artificial Intelligence
 * Chao Gao, Martin Müller, Ryan Hayward (2017). Focused Depth-first Proof Number Search using Convolutional Neural Networks for the Game of Hex. IJCAI 2017

=External Links=
 * Depth-first search from Wikipedia
 * Depth-limited search from Wikipedia
 * Iterative deepening depth-first search from Wikipedia
 * Depth-First Traversal from Wolfram MathWorld
 * Boost Graph Library: Depth-First Search
 * depth-first search from Dictionary of Algorithms and Data Structures by Paul E. Black, National Institute of Standards and Technology
 * Flat Earth Society & Ernst Reijseger - Down Deep, Jazz Middelheim 2012, YouTube Video

=References=

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