1.\" $OpenBSD: bs.6,v 1.13 2008/05/20 14:42:09 jmc Exp $ 2.\" 3.\" Copyright (c) 1997, Jason Downs. All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS 15.\" OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 17.\" DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, 18.\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 20.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 21.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.Dd $Mdocdate: May 20 2008 $ 27.Dt BS 6 28.Os 29.Sh NAME 30.Nm bs 31.Nd battleships game 32.Sh SYNOPSIS 33.Nm bs 34.Op Fl b | s 35.Op Fl c 36.Sh DESCRIPTION 37This program allows you to play the familiar Battleships game against the 38computer on a 10x10 board. 39The interface is visual and largely self-explanatory; 40you place your ships and pick your shots by moving the cursor around the 41.Sq sea 42with the 43.Xr hack 6 44motion keys 45.Em hjklyubn . 46.Pp 47Note that when selecting a ship to place, you must type the capital letter 48(these are, after all, capital ships). 49During ship placement, the 50.Sq r 51command may be used to ignore the current position and randomly place your 52currently selected ship. 53The 54.Sq R 55command will place all remaining ships randomly. 56The ^L command 57.Pq form feed, ASCII 12 58will force a screen redraw. 59.Pp 60The command-line arguments control game modes: 61.Bl -tag -width XxXXX 62.It Fl b 63Selects a 64.Sq blitz 65variant. 66This allows a side to shoot for as long as it continues to score hits. 67.It Fl c 68Permits ships to be placed adjacently. 69Normally, ships must be separated by at least one square of open water. 70This disables that check and allows them to close-pack. 71.It Fl s 72Selects a 73.Sq salvo 74variant. 75This allows a player one shot per turn for each of his/her 76ships still afloat. 77This puts a premium on scoring hits early and knocking out 78some ships and also makes it much harder, for example, when you face a superior 79force with only your PT-boat. 80.El 81.Sh AUTHORS 82Originally written by one Bruce Holloway in 1986. 83Salvo mode added by Chuck A. DeGaul (cbosgd!cad). 84Visual user interface, 85.Sq closepack 86option, code rewrite 87and manual page by 88.An Eric S. Raymond Aq esr@snark.thyrsus.com , 89August 1989. 90.Sh NOTES 91The algorithm the computer uses once it has found a ship to sink is provably 92optimal. 93The dispersion criterion for the random-fire algorithm may not be. 94