I'm not good at ko. I have won ko few times.
My 63th KGS game (vs [7k], komi: 0.5, B)
I got greedy, when the white played jump at H4. I played attachment at B. I had to play knighte's move at A. If I played so, the black group in the lower side could live easily.
After all, it became ko because of my greed...
The opponent avoided ko in the lower side. It's lucky for me.
However I played bad move. I connected at B, when the white played ate. I misunderstood the number of liberty of the Q6 black group. I could play connection at A.
It became ko again...
When I played first ko threat, the opponent didn't play in time. Fortunately I won.
All moves are here.
I have two ko threats more at the points marked triangle. The opponent has only one ko threat at the point marked square. But the points marked A and B may work as ko threat of the white.
When the white play the ko threat at A, if I connect at 2, the black will win the fight by the order of moves.
About at B, the black group in the left side will live by the sequence of moves.
In conclusion, neither A nor B works as ko threat. However I'm unconcern of my ability to play the correct order of moves. I was very lucky to win.
I study tesuji with some books lately. That's why, I became to be able to look at some tesuji in some games.
My 59th KGS game (vs [4k], 4 stones game, B)
I could capture the N6 white group by a tesuji. It's a result of the study. I was very happy. But...
When the white played parallel move at O18, I played descent at B. If I played block at A, I would win easily. It became a complicate fight in the game, although.
When the white played cut at Q15, I couldn't find a nice play in time. I lost by running out of time.
Can you find a tesuji in this situation?
Yes. If I played turn at O19, I could win the fight. Tesuji is terribly important. When both player play many tesuji in a game, it will be a beautiful and interesting game.
The game was a really exiting game for me, although I lost!
All moves are here.
When I captured a big group of the opponent, I get used to think I will win the game. Many players probably think so. But of course it's not always true.
My 57th KGS game (vs [13k], 4 stones game, W)
The opponent resigned in this situation, because the M11 big black group was dead. I thought the decision was correct. However...
If the black had played to interrupt at E7, the white group marked triangle was dead. If so, the game came from behind.
I had not to play to brak an eye at N8, but to play to connect at E7, because the M11 black group couldn't have two eyes, even if I played tenuki.
And I made a computer play as the white to check wｈether there was a sequence of moves with which the white group marked triangle could live or not.
The computer found a completely different play.
If the white play to approach at S13, the black group marked triangle can not make two eyes!
I was not aware of it completely.
In the end, the decision of the opponent resigning was correct, because the play of the white to connect at E7 and to approach at S13 were miai. That is to say, the game had finished.
All moves are here.
