How to beat Isabel
Isabel is a advanced bot on Chess.com, listed at 1600. Here is what the games look like, what usually goes wrong, and how to see exactly where yours did.
Updated
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How Isabel plays
Isabel is listed at 1600 and plays like a competent club player for twenty moves. The difference from a human of that rating is what happens after: the bot does not get tired, but it also does not form long plans. Losses to Isabel typically show the player winning the opening on the eval graph, then handing the advantage back in one or two tactical oversights around moves 20–30.
The plan
Slow down exactly when the position opens up. Check every capture and every check for both sides before moving, and convert small advantages by trading down.
Review the game you just lost
Bot games on Chess.com have their own address once they are finished: chess.com/game/computer/…. Type rv in front of it — rvchess.com/game/computer/… — and the full review builds itself: accuracy for both sides, every move labelled, and a graph you can click to jump to the moment the game turned. It is free, needs no account, and does not count against Chess.com's daily Game Review.
If you cannot find the address, paste the game's PGN instead. Chess.com's Game Review is limited for free members, so this is also the way to review every bot game rather than one a day.
Which move to look at
Against a advanced bot the useful move is rarely the last one. Open the review, find the first place the graph tips against you, and ask what Isabel was threatening there. That is the pattern to fix; the final blunder is just where it showed up.
Bot strengths are as Chess.com listed them at the time of writing; the site re-rates and adds bots. This site is not affiliated with Chess.com.