White 13 and 15 are of course kept back as ko threats. Black's territory is reduced to 8 points, while white has captured a stone.
here instead of is not good. White makes a seki. This is 6 points worse for black than the previous answer.
If Black connects, White makes seki in sente, for a result of -4. (White has lost 2 stones, but Black will have to give up one later.)
If Black takes the corner, White captures 4 stones in sente. The result is also -4. White has 14 points, but Black has 10.
Bill: Since I had overlooked Black's play on the 2-1 ( in the Key Point (1a) diagram), my original (supposed) solution was wrong. Let me try again.
( was the last play before this diagram.) connects at .
This position can be reached after in Andre's original digram. gains 2 points for Black, by comparison with the hane at 8.