I'm not aware of any online ones. Even if they exist, they'd probably be Java or Flash based, and I wouldn't mess with those, both for performance and security reasons. Just download something and run it on your own hardware.
Online Chess Engines

I can't. Must be online. I have a Mac from 2006 and the OS cannot be upgraded any further due to hardware limitations...ergo, I can't download a chess engine that will work on my system.

I don't know anything about Macs, but surely you could find some old chess GUI and engines that run on your OS? Maybe this link can help:
http://julien.marcel.free.fr/macchess/Chess_on_Mac/Interfaces.html

Thanks. Miraculously, this version of SCID worked on my old Mac. SCID looks powerful, but does not seem very user-friendly. I'll have to figure out how to use it properly. I don't even know what engine it is running.

Are there any decent online chess engines into which you can enter a game you played and see tactics you missed and suggested lines? Bonus if you can enter a position and have the engine play it out like a puzzle. I have tried looking through other posts but haven't found one.
chess.com has this feature....I think you have to be a member to have unlimited use of it though.

Are there any decent online chess engines into which you can enter a game you played and see tactics you missed and suggested lines? Bonus if you can enter a position and have the engine play it out like a puzzle. I have tried looking through other posts but haven't found one.
chess.com has this feature....I think you have to be a member to have unlimited use of it though.
True, but it takes long time to get the analysis ready, though

That looks interesting. I'll have to experiment with it sometime soon. It doesn't require Java or Flash, only Javascript, and it claims to somehow be using or consulting with Stockfish 5. I'll have to see how its analysis compares to analyzing on a standalone PC.

yeah. Search up free online chess engine in google. Hit the first choice. Then change the engine to whatever you want. There are lots of choices. Finally, play anaylze your game. I anaylze my games with it sometimes
Doing that brings me to analyse.deep-chess.de
Did you have a different link?

yeah. Search up free online chess engine in google. Hit the first choice. Then change the engine to whatever you want. There are lots of choices. Finally, play anaylze your game. I anaylze my games with it sometimes
Doing that brings me to analyse.deep-chess.de
Did you have a different link?
It doesn't look like that website lets you analyse a whole game, only a specific position.

Not bad, but I couldn't figure out how to analyze a whole game, so I'm assuming it only analyzes a single position. Also, the cpu resources are a bit weak, which you'd expect from an online service. Using only one of the two cores on my not-so-great laptop, I could analyze to the same ply depth in 11 seconds what takes cpuchess 45 seconds to do.

Not bad, but I couldn't figure out how to analyze a whole game, so I'm assuming it only analyzes a single position. Also, the cpu resources are a bit weak, which you'd expect from an online service. Using only one of the two cores on my not-so-great laptop, I could analyze to the same ply depth in 11 seconds what takes cpuchess 45 seconds to do.
Well,at least it has the strentgh of a strong engine. May not have the speed though.
Are there any decent online chess engines into which you can enter a game you played and see tactics you missed and suggested lines? Bonus if you can enter a position and have the engine play it out like a puzzle. I have tried looking through other posts but haven't found one.