1: aphirst (851) ☗1☗2☗52020-01-30 22:50

For black:

17 is an obvious blunder, losing the bishop for no reason. Pay attention to 16 which opened the bishop diagonal. Also, 17 destroys a perfectly fine mino castle. Leave the gold on 49 where it is!

2: aphirst (851) ☗1☗2☗52020-01-30 22:52

For black again, 13 is a poor move, as it leaves the bishop unprotected. Don't move the silver first when the bishop diagonal isn't closed!