Sample Analysis

See what WhyThisMove shows after one mistake.

This is a clearly marked demo, not a real user report. It shows the kind of coaching explanation a new player sees after importing a game.

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Position

You developed actively, but the center defender is pinned.

r1bqkbnr/pppp1ppp/2n5/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R b KQkq - 2 3

Your moveBc4?

Engine swing-1.2

Better moveRe1

What the coach explains

Bc4 looks natural, but it leaves the e4 pawn tactically vulnerable. Because the knight is pinned, ...Nxe4 becomes hard to answer.

The problem is not only the pawn. It is the timing: you started development before removing the pin that holds your center together.

Before playing an active move, ask whether a pinned piece is still defending something important.

The goal is to keep engine accuracy while making the lesson understandable.

Objective best move, evaluation, and tactical refutation.

What players at your level usually choose in real games.

Which natural-looking mistake tends to repeat.

A plain-language lesson you can use next game.

Why it failed: The move allows ...Nxe4 because your knight is pinned and the center defender cannot recapture safely.
Better move: Re1 breaks the pin first and prepares d4.
Lesson: Before attacking, ask which piece is pinned and which center pawn is loose.
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