Avoid hanging pieces: check threats before moving
Many beginner games are decided by one piece left under attack. A small checking routine is more useful than trying to calculate ten moves at once. Find direct threats before deciding, and inspect the opponent's captures before taking a piece. “Undefended” should be the conclusion of a check, not a first impression.
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Respond to the last move first
What changed after the opponent's move: an attack on your king, an opened bishop line, a defender leaving? If you are in check, first find a legal escape. Then inspect captures for both sides. Do not focus only on the piece you want to develop. Spotting the opponent's threat before your own attractive plan takes all your attention can save material.
Capture only after checking the reply
White has king g1, rook d1 and pawn h2; Black has king g8, knight d5 and pawn a7. The rook sees the knight along the open d-file. After d1×d5, Black has no immediate capture of that rook. We checked the entire small position, rather than merely noticing a straight line. The example teaches you to spot loose material, not that every available capture is profitable.
One pawn changes the conclusion
Add a black pawn on c6. Now d1×d5 meets c6×d5: the rook is lost for a knight. Rough values such as “rook about five, knight about three” identify the unfavourable trade, but are guidelines, not rules or an exact position evaluation. Watch pawn diagonals carefully: a pawn defends an adjacent forward square even if it stands far from your intended movement line.
Exercise: two pictures, not a long calculation
Before playing, name every black piece and all ways to capture a rook on d5. Repeat with the extra c6 pawn. In your next practice game, use two pictures: before your move and afterwards. In the second, ask for the opponent's most unpleasant legal action. Afterwards identify one blunder and the specific attack you missed. Hints help comparison, but give your own answer first.
Your move now.
Practise the idea on the board. You can make mistakes, try again and start over.
Open exerciseRules and sources
Use these links to check the rules and explore the topic further.