caranthir: Added. It's slightly better to leave R16 unplayed until the ko, so as to use it as a local ko threat (Q15 is equally valid threat too*). I added those variations also. -------------------- (*) at a surface the Q15 threat makes less sense to me if the opponent connects at R16 instead of takes, but Katago likes the threat anyway and doesn't like connecting as response -> if in this case we win the ko, opponent shape is worse.
Added. It's slightly better to leave R16 unplayed until the ko, so as to use it as a local ko threat (Q15 is equally valid threat too*). I added those variations also. -------------------- (*) at a surface the Q15 threat makes less sense to me if the opponent connects at R16 instead of takes, but Katago likes the threat anyway and doesn't like connecting as response -> if in this case we win the ko, opponent shape is worse.