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Built-in privacy features help protect your information and keep your Mac secure. An updated start page helps you easily and quickly save, find, and share your favorite sites. And Siri suggestions surface bookmarks, links from your reading list, iCloud Tabs, links you receive in Messages, and more. 'BRITISH WARSHIPS, 1914-1919', published by Ian Allan, 1972, is the only available listing of most of the vessels that served in the Royal Navy during the Great War and into 1919.

Use Chess on your Mac to play a match online, against your computer, or even against yourself.

Play a game

In the Chess app on your Mac, do any of the following:

• Challenge your Mac or a person to a game: Choose Game > New.

  Tip: When you start a new game, move the pointer over the items in the Variant and Players pop-up menus to get information about them.

• Play a match online: Sign in to Game Center, choose Game > New, click the Players pop-up menu, then choose Game Center Match.

• Get hints: Choose Moves > Show Hint. An arrow points to where you should move the piece. If the level of difficulty is set to Faster, hints aren’t available.

• Take back a move: Choose Moves > Take Back Move for each move you want to undo.

• See moves: Choose Moves > Show Last Move; an arrow points from the piece’s originating square to its new square. To see all the moves made during a game, choose Moves > Game Log.

Customize a game

In the Chess app on your Mac, do any of the following:

• Set the level of difficulty: Choose Chess > Preferences, then drag the slider toward Faster or Stronger to decrease or increase the difficulty or speed (not available when you’re playing another person).

• Change the look of a game: Choose Chess > Preferences, then choose a style for the board and pieces.

• Change the viewing angle of the board: Click and hold any corner of the board, then adjust the viewing angle using your mouse or trackpad.

• Hear moves spoken: Choose Chess > Preferences, select the checkboxes for the moves you want to hear, then choose the voices.

Use spoken commands

Make sure keyboard dictation is on in Dictation preferences.

1. In the Chess app on your Mac, choose Chess > Preferences, then select Allow Player to Speak Moves.

2. When you see the feedback window (it shows a microphone icon with a fluctuating loudness indicator), press the shortcut key (the key you specified in Dictation preferences), then speak a command.

   Try not to hesitate while speaking.

You can use spoken commands for the following actions:

Contents

1 What is Blackthorn?

Blackthorn is a framework for writing 2D games in Common Lisp. Blackthorn is attempt to write an efficient, dynamic, persistent 2D game engine in an expressive language which makes it easy to write games.

2 Why another game engine?

Games are hard to write. The effort needed to write a usable game engine from scratch, especially when dealing with the low-level details of languages like C, make the cost of writing games prohibitive. Libraries like SDL get many of the driver-level graphics details out of the way, but still leave the user writing in C. Libraries like PyGame and LISPBUILDER-SDL wrap more of these low-level details, but still don’t provide a full game engine needed for writing substantial games.

There are, of course, game engines which provide this functionality to the user. Game Maker, for example, is an engine which provides everything needed to make a basic game, and an extention language for writing more complex behavior. Using Game Maker, an experienced user can write a basic game in five minutes. However, Game Maker (and similar programs the authors have tried) have some substantial flaws. Problems with Game Maker, specifically, include:

• Game Maker only runs on Windows. A Linux port is still a dream, and porting to any sort of mobile device is completely unimaginable.
• Game Maker’s extension language, GML, is a kludge, and inefficient. (The lack of a rich set of built-in datastructures is something I hear GML users complaining about frequently.)
• Game Maker is closed source, so it would be impossible for anyone other than the authors to fix any of the above problems with Game Maker.

3 What does Blackthorn provide?

Blackthorn attempts to fix many of the problems above. Blackthorn provides:

• A not-yet-complete subset of the functionality provided by Game Maker. Despite being incomplete, Blackthorn is already capable of supporting simple games.
• Blackthorn is written in Common Lisp, providing:
  • Efficiency which is (depending on the implementation, and the benchmark) capable of competing with C.
  • Portable to any platform supported by a compliant ANSI Common Lisp compiler. Blackthorn currently runs on Windows, Linux, and Mac OSX. Porting Blackthorn to a new compiler takes a couple of hours.
  • Dynamic behavior, because the entire compiler is available at runtime. An on-screen development REPL (read-eval-print loop, i.e. a development console) with an on-screen debugger is provided, giving the user the ability to rewrite arbitrary pieces of code on the fly.
  • Extensibility, because the game engine itself is an open platform, and because user code operates at the same level as the game engine.
  • And finally, because Blackthorn is open source, it is open to improvements from the community.

4 Technical details

Blackthorn uses LISPBUILDER-SDL for graphics support (which internally uses SDL and SDL_image), and CL-STORE as an internal database for object persistence.

Blackthorn currently runs on Windows, Linux, and Mac OS X, under Allegro CL, CLISP, Clozure CL, and SBCL. Blackthorn has been tested successfully on the following OS/Lisp combinations:

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