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Manual Reference Pages  -  BS (6)

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bs - battleships game



bs [-b | -s] [-c]


This program allows you to play the familiar Battleships game against the computer on a 10x10 board. The interface is visual and largely self-explanatory; you place your ships and pick your shots by moving the cursor around the ‘sea with the rogue/hack motion keys hjklyubn. If your UNIX has a modern (non-BSD) curses, your arrow keys will also work.

Note that when selecting a ship to place, you must type the capital letter (these are, after all, capital ships). During ship placement, the ‘r command may be used to ignore the current position and randomly place your currently selected ship. The ‘R command will place all remaining ships randomly. The ^L command (form feed, ASCII 12) will force a screen redraw).

The command-line arguments control game modes.

        -b selects a ‘blitz variant
        -s selects a ‘salvo variant
        -c permits ships to be placed adjacently

The ‘blitz variant allows a side to shoot for as long as it continues to score hits.

The ‘salvo game allows a player one shot per turn for each of his/her ships still afloat. This puts a premium scoring hits early and knocking out some ships and also makes much harder the situation where you face a superior force with only your PT-boat.

Normally, ships must be separated by at least one square of open water. The -c option disables this check and allows them to close-pack.

The algorithm the computer uses once it has found a ship to sink is provably optimal. The dispersion criterion for the random-fire algorithm may not be.


Originally written by one Bruce Holloway in 1986. Salvo mode added by Chuck A. DeGaul (cbosgd!cad). Visual user interface, ‘closepack option, code rewrite and manual page by Eric S. Raymond <> August 1989. Keypad support and ANSI/POSIX conformance, November 93. See \m[blue]\m[] for updates, also other software and resources by ESR.

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bs BS (6) 12/14/2014

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