Hot answers tagged tsumego
GoProblems http://www.goproblems.com/ The traditional problem site. Has many user contributed problems. Personally I'm not too fond of it, since the problems often vary in style getting me out of the problem solving flow.
Yes, there are many examples if you look up a go "bestiary" (= One such position: $$B Status? $$ ----------------- $$ | O O X . O X . . $$ | O . X . O X . . $$ | X X X O O X . . $$ | . . O , O X . . $$ | O O O O O X . . $$ | X X X X X X . . $$ | . . . . . . . . If it is Japanese, Chinese, or AGA rules (basically anything without suicide), then white is ...
The key is that killing the black stones doesn't give White an eye. After White captures the two stones, Black will throw in at the same place he played in #3. White can capture that stone too, but later in the game the stone above the capture will be placed in atari, and White will have to fill in the "eye" on the right. Because that can happen, it is a ...
Since T14 allows a sente hane, the initial board effectively looks like this: $$W $$ ------------| $$ . X O . . . | $$ X . X O . . | $$ . . X O . . | $$ . . X O O . | $$ . . X X O . | $$ . . . O X 1 | $$ . . . X 2 . | $$ . . . . . . | The usual attempt is to hane from the outside, then kill by playing at the vital point: $$ ------------| $$ . X O 4 3 . | ...
Actually, White is dead after you fill that liberty. He can never attack the Black stones, but Black can capture the stone in the corner. After that there is a ko that will kill White. There's no way for White to win the ko - filling it in leaves the white stones in atari. At the end of the game when White has no more ko threats, Black can take the ko, ...
Black lives: $$B $$ ------------------- $$ | . 1 . . X O . . . $$ | O X . X X O . . . $$ | . X X O O O . . . $$ | O O O . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . . White kills unconditionally: $$W $$ ------------------- $$ | . 2 1 . X O . . . $$ | O X . X X O . . . $$ | 3 X X O O O . . . $$ | O O O . . . . . . $$ | . . . . . . . . . $$ | ...
I think black should play 2-1 then 3-1 and 1-3 are miai for b life, no need for ko
GoChild http://gochild2009.appspot.com/ Currently my favorite. Has several large collections of problems. I like it for mass solving relatively simple problem. First you need to login with a google account. Then choose a collection on the right. And finally you need to switch to the Question or Progress tab on the right to solve problems.
Life and Death by James Davies is part of the Elementary Go series, and has a systematic treatment of common shapes. It has saved me more reading time than I can count.
I'm tempted to say its either ko or seki, black's choice. $$Bm1 $$ |------------ $$ | . 2 1 . X . $$ | . 3 O X . . $$ | . . O O X . $$ | . . O X . . $$ | . O O X . . $$ | . X X X . . $$ | . . . . . . W2 is the only move, and B3 enters the ko. $$Bm1 $$ |------------ $$ | . 2 1 . X . $$ | 3 . O X . . $$ | . . O O X . $$ | 4 . O X . . $$ | . O O ...
Yes, that's the best you can do.
Oh sorry now I see: Pretty tricky sequence :-)
I'll second TimK's suggestion of Life and Death, particularly for developing a general approach, and also throw in a few others I've found useful: The Korean Problem Academy is an excellent collection of progressively more difficult problems. The books themselves are the best way to go if you can find them, as they have no answer key but generally can be ...
Get Strong at Life and Death starts with a section on standard shapes. The second part of the book contains problems arising from joseki and joseki variations. This is an advanced book - aimed at dan-level players.
GoGrinder There is a cheap app for PC and mobile called GoGrinder. (see also) From my experience as well as what I heard from others it's a useful piece of software at a very reasonable price.
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