Stupid Moves

Winning against the wrong group  

A group with an eye wins a capturing race against a group without an eye but loses it against a group with two eyes. was definitely a mistake here. White had some possibilities for ko too, but some persistence... -- HolIgor

White lives but loses two stones  

The problem here seems to be that White wants it all. Instead of trying to defend two stones, which are not directly relevant for the capturing race, White should just start reducing Black's liberties straight away. Black will capture the stones but arrive too late to save the corner.
White can of course choose to play the ko (after ), but it is probably not favourable.

Black kills if White misreads  

Black can try this to kill White. If White misreads the position, playing is suicidal. (White can resist with at , but Black a, White b at 1 and Black c wins the semeai.)

But of course, White should not respond to with , but play at and make the group live. Black will then play a to make two eyes for the black group in gote. Similarly, if Black plays at , White should respond at , and will win the capturing race. -- Morten Pahle (10k)

Black makes ko  

Black does not choose to live gently (i.e. thinking of winning the ko) and then throws in at and before playing . White is now behind in the fight with no internal ko threats. -- Dave Sigaty

Vital point  

is the vital point, I believe.

Ko  

Black makes a large ko.

Two stage ko  

Earlier, threatens to make two eyes. - makes a two stage ko.

Better for Black  

takes the vital point. threatens to make a second eye with . Through Black makes ko.

White dies  

Capturing with is not so good. throws in and kills.

A very small endgame mistake  

Strange thing but happened in one of my games recently. I was so glad. The correct move is to capture at a. -- HolIgor

A wasted move  

This happens quite often with weaker players. Black decides to save the marked stone and plays . White continues with , so becomes a totally wasted move. Correct moves are at a or depending on the situation. Then Black has sente in this corner. -- HolIgor

Small typical 5 kyu mistake  

Amazing how often this happens at my level (5k* IGS). is a mistake. After the correct answer at a is in atari. It is small: but several small things like this and you've lost the game. -- HolIgor

White 2?  

What a silly move is!

Try the cut!  

Much more fun!

Continuing. 5 at 2.  

Can White kill or is there a ko in the corner?

No ko  

Robert Pauli: I'd say there is no ko. W has no problems to capture.

On IGS a 9-stone handicap game  

Definitely I'm not Black! I just decided to test Black...

On IGS a 9-stone handicap game (continued)  

... and when I played , he said "Wow!". and are wrong moves, I guess you can figure out why yourself. :)

Black-2 at solves this problem. As I see it, White cannot kill any stones here without help from Black. ---PokaMyoshu

Double-hane at edge.  

I've seen this happen often with beginners, and done it myself a couple of times too. White just played , and Black went at . If were one point to the left, would have been good. -- Bisqwit

A funny ko-threat  

Looking through some of my old games I've found this funny ko threat. HolIgor

Black played tenuki  

Robert Pauli: Since in symmetric positions best play "absolutely certainly" is in the center, and a and b doubtless are miai, I left the scene . . .