How to beat Martin
Martin is a beginner bot on Chess.com, listed at 250. Here is what the games look like, what usually goes wrong, and how to see exactly where yours did.
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How Martin plays
Martin is the first opponent most people meet on Chess.com and the most-played bot on the site. He hangs pieces, walks into one-move tactics, and never resigns, so games against him are long. Reviews of losses to Martin almost always show the same thing: the player was winning by a lot, stopped checking for captures, and gave a piece or the queen away in one move.
The plan
Before every move, look at what Martin can capture. That is the whole method. If you are ahead by a piece, trade everything and promote a pawn; do not go hunting for checkmate in a crowded position.
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 beginner bot the useful move is rarely the last one. Open the review, find the first place the graph tips against you, and ask what Martin 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.