(;AP[HexGui:0.10.GIT]
C[2020/07/01

Black\: Peter
White\: Joachanna

Training mode (help given to White).

White wins.
]
FF[4]GM[11]SZ[6];B[a2];W[c3]
C[White's unique winning move was d3, so this is losing.];B[d3]
C[Black keeps the win.];W[d4]
C[f2, f4, e3, e4, c4, b5 are winning for Black.

Why?

The rest are losing.
]
(;B[e5]
C[A losing move!

Here, Black intends for White to reconnect at f3, so that Black will have a ladder escape. 

But White has a better move.

c4 was winning for Black.]
;W[e2];B[d2];W[c4])(;B[c4];W[b6];B[a6];W[b5];B[a5];W[b4];B[a4]))
