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It has a dedicated [[GUI]] with various dialog windows to edit positions, to load and save [[Forsyth-Edwards Notation|FEN]] or proprietary GST-files of problem collections, and to control the search.
Beside [[Brute-Force|brute-force search]] accelerated by a [[Transposition Table|transposition table]], several automatic or user defined constraints such as number of escape squares for the checked king, allow shallow and deep searches of up to 170 moves (339 plies).
=Longest Problem=
The longest for Gustav solvable problem so far has 163 moves, a composition by [https://en.wikipedia.org/wiki/Ott%C3%B3_Bl%C3%A1thy Ottó Titusz Bláthy] <ref>[https://www.schachversand.de/en/gustav-4-0-i.html Gustav 4.0] from [[Schachversand Niggemann]] (German)</ref>:
