RTG Problem 56 / Solution

Solution  

The combination of and allows Black to enlarge the eye into a bulky five, which has 7 liberties. Note that has no other move. Black wins the capturing race by one move because White has only 6 liberties including the approach move at a.

Verification 1  

This diagram shows the verification that Black wins this capturing race.

Verification 2  

As each player has a bulky four, moves first and wins by one move.