Alena, I left you message on the promotions puzzle. You are right up to move 5 for white- black has a more testing defense than 5. ....Bc7.

V-1

1.Kb2 Kb7
2.Kb3 Kc7
3.Ka4 Kb6
4.Kb4 Ka6
5.c5 Kb7
6.c6+ Ka6
7.Kc4 Kb6
8.Kd4 Kc7
9.Ke3 Kc8
10.Kf4 Kd8
11.Kg5 Kc7
12.Kf5 Kb6
13.Ke6 Kc7
14.Ke7 Kc8
15.Kxd6
It's a win for white.

V-2

1.Kb2 Kb7
2.Kb3 Kb6
3.Kb4 Ka6
4.c5 Kb7
5.c6+ Kc7
6.Kc3 Kb6
7.Kd3 Kc7
8.Ke4 Kd8
9.Kf5 Ke7
10.Kg6 Kd8
11.Kf7 Kc8
12.Ke7 Kc7
13.Ke6 Kc8
14.Kxd6
It's a win for white.