19:55, Siasio says that I should not play in N1. (analysis starts at 19:10). However ... In order to extract full value of B3, black must know the value of the pandora box of cutting at H3. Cutting at H3 is not sure points, it is only pandora box. Therefore I belive it is correct to give up 1-2 points and go for a gain (N1) that avoids the uncertainty while ahead.