BARDEN’S CHESS PROBLEMS

You don’t need to be a strong chess player or an expert problemist to solve today’s puzzle – just a capacity to add up plus a certain flair for finding offbeat travel routes. The board shows the normal starting position. In how many ways can White deliver check in three moves without Black moving at all?

There are 23 ways to check in three moves, starting 1 Na3 (3), 1 Nc3 (6), 1 c4 (1),

1 c3 (2), 1 e4 (5), 1 e3 (5) and 1 g3 (1).