de la Villa: 50 Mistakes you must knowValuable Lessons for Every Chess Player It is not the quality of your best moves that wins you games; it is the quality of your worst moves. The quickest way to improve your chess skills is to raise the bar. The Spanish grandmaster and coach Jesus de la Villa has proven with his best seller 100 Endgames You Must Know that he understands exactly what a chess student needs. Building on his experience as a writer and as a coach for juniors, he has