30 Years of chess teaching have shown Charlie Hertan the central role of human bias in the failure to find winning moves. "I decided to write a different tactics book, a book which focused on the mental processes involved in finding the killer move."
"This weighty tome is all about improving your tactical play."
British Chess Magazine
One of the 650 exercises:

What is Black's most forcing move?
What do reviewers say about Forcing Chess Moves?
"Hertan encourages us to think with 'computer eyes', by first examining all the forcing moves (checks, captures, threats), no matter how daft they seem. Why? Read more...  
Why does HUMAN BIAS prevent you to find the winning move more often?
Your brain tends to disregard many winning moves because they are counter-intuitive or look unnatural. Charlie Hertan says: you can overcome your prejudice by developing computer eyes.
How do COMPUTER EYES improve your tactical vision?
A computer never rejects a move offhand. It doesn't come up with negative labels out of the blue, as we humans tend to do ('this move is too passive', 'it ruins my pawn structure'). A computer calculates first, then draws conclusions.
Why does studying FORCING MOVES improve your calculation skills?
It promotes analytical precision. 'Close enough' won't do.
It helps to develop 'board sight', the ability to envision more clearly where all the pieces are
It helps to overcome human bias and staleness in your thinking
It helps you to enjoy the challenge of calculating difficult variations.
Why study forcing moves FIRST?
Forcing moves work better and quicker. When they work, they have the potential to transform the game, by leading to concrete gains.
It saves precious time. Countless winning positions have been squandered by wasting huge amounts of time on obscure ideas, when a clearly decisive move was available.
By reducing the opponent's options, forcing moves reduce the risk of calculation error.

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Forcing Chess Moves: The Key to Better Calculation, New In Chess 2008, paperback, 382 pages, $28.95 /  24.95
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One of the 650 exercises:

Find the monstrous surprise forcing shot for Black.
A forcing move is a move which limits the opponent's options. Many players think only of checks, captures, or flashy sacrifices when they hear this term, but frequently these are far from the most forcing choices.

"When the clock is ticking away, and you have too many viable candidate moves to choose from, remember Hertan's advice."
Steve Goldberg, ChessCafe

Endorsed by three-time US champion Joel Benjamin. "By organizing and explaining the nature of great chess moves, Hertan has brought us all closer to being able to find them."