This year we only had five players in the Austrian Championship Finals as one participant was forced to skip the tournament due to a potentially contagious infection.
Undefeated until the penultimate round, it came as a shock to everyone, especially myself, that I lost to a random 5d in the last round. orz
I was (and still am) particularly shaken as I only found out that I lost when we counted out the game. I kept counting during the game and every time I was winning. I can only blame myself for getting old T_T 内心崩潰
In retrospect, it seems that White was winning throughout the game.
…until this nobi, technically the losing move.
After a series of exchanges, Black’s kosumi 8 is the winning move. After this move, White is finally losing. I had expected Black to connect k13 so that I could play here.
Objectively speaking, White still had chances after the nobi: It seems that ignoring either the block 2 or the hane 4 in order to cut at k13 would have won White the game as well. That is just how massive this move is. (Locally I counted a difference of ~20 points.)
The best sequence for White that I found was to push Black inside my centre. But even after coming back at 16, the territory has shrunk decisively. How I still counted myself ahead is beyond me.
This is just one of the sequences that don’t work for White. Somehow every variation ended in me dying by one liberty.
Going back to the technical losing move, White should have jumped directly here. None of the sequences would have happened. Since Black won by 4.5 in the end, this was a decisive mistake that changed the outcome.
According to GoR calculator, at 2630 rating I have a winning expectancy SE of 84.7% against a player of this calibre. (Though interestingly their SE is 13.7%, giving leeway to a jigo.) I hadn’t lost in tournament to someone under 2500 for over a year, so statistically it would have been about time (because this is exactly how statistics work). But the timing was just too unfortunate.
Gonna have nightmares and grump for about two weeks.