Calculation

Working through a random set of combinations from the Anthology of Chess Combinations, third edition, I find that I need the patience to slow down and improve the accuracy of my calculations. Too much blitz and timed tactics solving has cultivated an expectation that I should see things instantly.

This position is a case in point. I found the correct key (first move), the correct idea, and saw clearly and correctly the final position. However, I missed the second move of the sequence.

White to move