DotsGoOngoingGame/Game losing move

White 100  

Bill: () was the last losing move. A play at a instead holds Black's huge group that spans the left half of the board ( to ) to one eye, and it loses the semeai with White's group to its right.

LukeNine45: But had killed, () would be the losing move for black (as it should have been). If had saved the group like it should have, then would probably be at the same place, and then B101 would probably be at , resulting in the same position. If my thinking is correct, then hasn't white actually made the "real" mistake somewhere else? In other words, if had been correct, then this would be an example of "black losing the game" instead of "white winning the game," no? (At this point, I re-read what you said and noticed the word "last". Oops, sorry. What were the prior losing moves?)

White 100  

Alex: Unfortunately for my ego, Bill is right. I immediately felt stupid for my move on the top side after I'd played it, though for different reasons (because after a-b-c-d we're left without eyes), so there probably should have been a better way to connect those stones while making an eye... so I was happy that we managed to pull of seki.

I didn't realise we could kill the Black dragon because I hallucinated that would escape or cut off some stones, but of course all our stones are connected in a very roundabout way so we can let him link up with his other eyeless stones and, as Bill says, win the semeai.

Dots Go is not a good game for me. I'm very prone to hallucination even in regular Go and the crazy spiraling dragons and billions of miai points of Dots Go are way too much for me to keep mental track of. If you were going to invent a game to play to my weaknesses, this would be it. ;-)

Black 99  

unkx80: Suppose Black 99 plays correctly at or a. Then should be played as shown in this diagram, not at b. The reason is that if is played at b, Black can play at , causing an exchange of 5 black stones and 7 white stones, which is profitable for Black.