.\"	$OpenBSD: bs.6,v 1.15 2014/09/08 01:27:54 schwarze Exp $
.\"
.\" Copyright (c) 1997, Jason Downs.  All rights reserved.
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.Dd $Mdocdate: September 8 2014 $
.Dt BS 6
.Os
.Sh NAME
.Nm bs
.Nd battleships game
.Sh SYNOPSIS
.Nm bs
.Op Fl b | s
.Op Fl c
.Sh DESCRIPTION
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
.Sq sea
with the
.Xr hack 6
motion keys
.Em hjklyubn .
.Pp
Note that when selecting a ship to place, you must type the capital letter
(these are, after all, capital ships).
During ship placement, the
.Sq r
command may be used to ignore the current position and randomly place your
currently selected ship.
The
.Sq R
command will place all remaining ships randomly.
The ^L command
.Pq form feed, ASCII 12
will force a screen redraw.
.Pp
The command-line arguments control game modes:
.Bl -tag -width XxXXX
.It Fl b
Selects a
.Sq blitz
variant.
This allows a side to shoot for as long as it continues to score hits.
.It Fl c
Permits ships to be placed adjacently.
Normally, ships must be separated by at least one square of open water.
This disables that check and allows them to close-pack.
.It Fl s
Selects a
.Sq salvo
variant.
This allows a player one shot per turn for each of his/her
ships still afloat.
This puts a premium on scoring hits early and knocking out
some ships and also makes it much harder, for example, when you face a superior
force with only your PT-boat.
.El
.Sh AUTHORS
.An -nosplit
Originally written by one
.An Bruce Holloway
in 1986.
Salvo mode added by
.An Chuck A. DeGaul Aq Mt cbosgd!cad .
Visual user interface,
.Sq closepack
option, code rewrite
and manual page by
.An Eric S. Raymond Aq Mt esr@snark.thyrsus.com ,
August 1989.
.Sh NOTES
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.