Figured this topic could use it's own thread. The simplest way is:
"o" to load game record file (note Tygem etc autosaves game records where the program is installed)
"a" to analyze the game, pick your playouts based on how much patience you have
I pointed out to Bill Spight that if the Bot doesn't consider the move actually played, you can just play it and force it to analyze that move. In this use case you already have the entire game record, so of course the Bot is forced to analyze the actual game moves, and it will give accurate(tm) winrate evals, along with how big a mistake it thinks your actual move is.
But you can also just scroll through the game with pondering on ("space"), and for practical use the finer points of how many playouts each move gets don't matter. You'll quickly notice when the bot is confused about a situation and needs more playouts -- the winrate will start fluctuating wildly every time you go to a new move, particularly if the bot did not expect it.
The bots are very strong, but not perfect, and it's not clear what exactly the winrates the bot gives means, or how accurate they are. Well humans are still very quick to learn generalizations, so if you just use the bots for awhile and you will get a natural feeling for what it means when a bot gives a 60% or 90% winrate. Also you'll notice that as the game gets closer to the end the winrates will get more extreme.
I've been using KataGo, and it supports variable komi. Using Lizzie you can use "e" to open the GTP terminal, and type "komi 7.5" etc. Using this method you can ask KataGo winrates for various values of komi:
8.5 W 55%
7.5 W 55%
7.0 W 50%
6.5 W 45%
5.5 W 45%
KataGo thinks 7.0 is fair komi. Note for area rules score differences are always(tm) odd, e.g. white ahead by 5, 7, or 9. This makes the winrates for komi of 7.5 and 8.5 the same.
Also note KataGo calls a 2 point mistake a 10% hit to your winrate! Keep this in mind when judging how serious a mistake is when analyzing games.
For my own games, I get the idea that reading is the most important factor in winning or losing games. It also happens that I play in the wrong part of the board or have the wrong whole board plan, but more often I don't see some tactic that allows me to cut, or allows me to tenuki etc.
The bots also reinforce my opinion that while debating the finer points of early opening theory is fun, it isn't particularly important to your winrate. Maybe it's because I already learned the basics of opening theory, but many of the debates I see about if a move should be high or low, or 3-space or 4-space extension simply don't matter that much. Move 2 most certainly did not lose the game!
I think this is a great thing because it allows everyone to pick the moves that they like. Don't worry if the bots say early 3-3 is the best, and you can keep splitting the side if you prefer that and accept a 2% winrate difference. But following trends is fun too so I've been playing early 3-3 every chance I get! OTOH I've traditionally played mostly 3-4 points in my opening, and I continue to do so. I just like it better than 4-4.