I'm looking for free software that automatically analyzes and annotates chess games (post-mortem), preferably marking blunders, suggesting good alternatives, pointing out missed tactics (forks, pins, skewers, removing the defender, etc.). Preferably it should also generate some printable output (eg PDF) so one could ruminate away from the computer, and in front of a chess board. What do you guys use for this?
Chessbase will do what you're describing (enter the game, then tell it to annotate), but it is not free.
Scid is a free alternative database program, but it will not automatically annotate your game.
See here for more discussion: http://www.chess.com/forum/view/general/is-there-any-free-software-to-analyse-the-completed-game
http://en.lichess.org/ allows to import a game in pgn and automatically generates computer analysis for it.
The best free chess software I've found is the Tarrasch Chess GUI. At the link you can DL the interface and a compatible engine of relatively strong strength. It provides a decent enough opening database, and will give you computer evaluations for each move.
BabasChess is free chess software (good for play on internet chess servers) that has automatic analysis with Crafty chess engine feature. It is somewhat basic but is useful and I think BabasChess is good as free software!
Most chess programs allow you to run an engine while you go through the moves of a game, and see the engine's evaluations. This is sometimes called a Kibitzer, Infinite Analysis or just Analyze. The program Chessbase and Tarrasch are examples of programs which do this.
Some programs can be set up to annotate, blundercheck or do a full game analysis. In this, you set how long the engine will look at each move, and what degree of error it should comment on. When it finishes its analysis, it shows you game notation marked with question marks and alternate lines. The programs that do this are Aquarium, Arena, Babaschess, Chess Assistant, the engine GUIs sold by the company Chessbase (Fritz, Hiarcs, Houdini, Komodo, Rybka, Shredder), Chessmaster, Chesspartner, Hiarcs Chess Explorer, SCID, SCID vs PC and the Shredder GUI sold by shredderchess.com. The engines Crafty and Yace also have an "annotate" feature.
On Windows, I use Chessbase, but I don't print anything out. On my Android phone, I use Chess PGN Master Pro, and on my iPad, I'll probably end up going with Giordano Vicoli's Chess_Studio, for analyzing.
Having tried almost all known software and tools to analyze my games,
decodechess.com gives a learning experience that's not seen anywhere else. It's more than just annotations of the style you were looking for, but actual explanations! Really cool stuff, worth trying and they run a generous free trial and are looking for feedback. Here's a screenshot of their cool tab system: