Endings improve your ability to calculate.
In an ending one loose move can mean the difference between a win and a draw, or even between a win and a loss.
In this week’s problem, White can easily lose if he does not find the right moves.
White wants to stop the pawn from promoting. It turns out that he cannot do this, but he can ask Black the question ‘Do you want a King or a Queen on the board?’
How does White to play win?