Tsumegos from real games

Harleqin · **#41**

jlt · **#42**

Problem #12, Black to play. It seems that Black can kill and that both players (1k Tygem) missed that during all the game.

Click Here To Show Diagram Code: [go]$$Bc Black to play $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . O . . . . . . . . . O . . . . . | $$ | . . . , O . . . . , . . . . . X . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . O . . . . . . . . . . . . . . . | $$ | . . O , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . O . . . . . . . . . . . | $$ | . . . . . . . O X . . . . . . . . . . | $$ | . . O . . . . O X . . . . . . . . . . | $$ | . O O . . . . O X . X X X . . . X . . | $$ | . X X O O O O X X , O . O X . , . . . | $$ | X . . X O X X O . O . . O O X X . . . | $$ | . X X X X X . O . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Answer:

jlt · **#43**

Problem #13: Black to play and kill the bottom group.

Click Here To Show Diagram Code: [go]$$Bc Black to play $$ --------------------------------------- $$ | . . . X . . . . . . . . . X O O . O . | $$ | . . X O O O . . O X . . . X O . O O X | $$ | . . X O . . O X O . X . . X X O O X . | $$ | . . O X O O . O . , . . . X X X X . X | $$ | . . X X . . . . . X O . O X O . . X . | $$ | . . . X X X O . . . . O X O O . . . . | $$ | . . X O O O X X X . O . X X . O X . . | $$ | . X . X . X O X . O O X X . . O . O . | $$ | . O X X X O O X X X O O X . . . O . . | $$ | . . O O O O . O X X O . O X . , . . . | $$ | . . . . . . . O O X X O O X . . . . . | $$ | . . . . O X X X O O O . O X . . O . . | $$ | . . O . . O . . X O O . O X . . O O . | $$ | . . . . . O X . X X O O X . X X O X . | $$ | . . . . . O X . . O X X X X . . X X . | $$ | . . . O O X . . . O . . . . X X O O . | $$ | . O O X X X . . X . O X X O . X . . . | $$ | . . X . . . . . X O . O O . O X X . . | $$ | . . . . . . . . O . . . . . . O . . . | $$ ---------------------------------------[/go]

Answer:

jlt · **#44**

This ridiculous position is from a blitz game.

Problem #14: Black to play. Which group should Black choose to kill and how?

Click Here To Show Diagram Code: [go]$$Bc Black to play $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . X . . . | $$ | . . O . . . . . . . . O . . X . X O . | $$ | . X X O O O . . . . . . . X X . X O . | $$ | . . . X X X O O O O . O . . . X O O . | $$ | . . . . . . X X X O . . . . . X X O . | $$ | . . . . . . . . . . . . . . . X O O . | $$ | . . . . . X . . X . . . . . . . X . . | $$ | . . . . . X O . . . . . . . . . . . . | $$ | . . . X X O . . . X . . . . O O . . . | $$ | . . X O O . O . O O X . . X O X . . . | $$ | . . . . . . . . . . X . X X X O O . . | $$ | . . X . . . O . . O X X O O X X O . . | $$ | . . . . X O O . . . X O O . O X O . . | $$ | . . . . . X O X . . X O . O . X . . . | $$ | . . X X . X X . . . X . . . . X O . . | $$ | . . O , . O . . . , X O . O O X O . . | $$ | . . . O . . . O . . X . O . X X O . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Answer:

jlt · **#45**

Problem #15: Black to play. What is the status of the lower right corner?

Click Here To Show Diagram Code: [go]$$Bc $$ --------------------------------------- $$ | . . . . . . . . . . . O X X . . X . . | $$ | . . . O . O . . . . . O O X O O X . . | $$ | . . O , . . . . O , O X X . X X . . . | $$ | . O X X . . O . . . O . O X X . . . . | $$ | . O O X . X X X . . . . O X . X . . . | $$ | . O X X . . O X . . X O . O X X O . . | $$ | . O O X . . O . X . . O O O O O . O . | $$ | . . . X . . . O O O . . O X X X O O . | $$ | . . . , . . . . . , . . . O X X X X . | $$ | . X X X . . O . . . . . . O O X X . . | $$ | . X O X O X . X X . . . . . . X O O X | $$ | . O O O X X . O X . X X O . O O X X . | $$ | . . . . . . . O X O . . . . . . X X . | $$ | . . . . X . X X O X X X X . O O O X . | $$ | . . O O O . . . O O O O . X X X X O . | $$ | . . X X O O O O . . . . . . . X O O . | $$ | . . . . X X X O . . . . . . X O . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ ---------------------------------------[/go]

jlt · **#46**

Problem #16, Black to play.

I was white playing an H9 game and killed the upper left corner. However, Black could have lived. How?

Click Here To Show Diagram Code: [go]$$Bc Black to play $$ --------------------------------------- $$ | . . . . . . . . O O X . . . . . . . . | $$ | . O O . X X O . O X X . . . . . . . . | $$ | X X X . X O . O X . . . . . X O O . . | $$ | . O O X X O . . . X . . . X . X X O . | $$ | O . . O X O . O X . . . . . . . X O . | $$ | . O . . O X . O X . . . . . . X X X O | $$ | . O . O O X . O X X . . . . . . X O . | $$ | O . O . O . . O X . . . . . . . X O . | $$ | . O X O . O . . O O X X . X . . X O . | $$ | . X . X . . . . . X O X X O . X O . . | $$ | . . X . . O . . . . O . O O X X O . . | $$ | . . . . . O . X X . . O . . X O . . . | $$ | . . . . X O X . O O O X X . X O O . . | $$ | . . X . X X O . O X X . . . . X O . . | $$ | . . . . X O O . X . . . . . . X X O . | $$ | . . X X . . . . . X . . . X . X O . . | $$ | . . X O . O . . O X . . . . . X O . . | $$ | X X O O . . . . O X . . . . X O O . . | $$ | . O . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

lightvector · **#47**

About problem 15 shape, one interesting thing to know, if we adjust the stones a little...

Click Here To Show Diagram Code: [go]$$Bc White status? $$ | . . . , . . . . . , . . . O X X X X . | $$ | . X X X . . O . . . . . . O O X X . . | $$ | . X O X O X . X X . . . . . . X . X . | $$ | . O O O X X . O X . X X O . O O X . . | $$ | . . . . . . . O X O . . . . . . X . . | $$ | . . . . X . X X O X X X X . O O X . . | $$ | . . O O O . . . O O O O . X X X X . . | $$ | . . X X O O O O . . . . . . . X O O . | $$ | . . . . X X X O . . . . . . X O . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ ---------------------------------------[/go]

Now white is alive and there is no ko.

Click Here To Show Diagram Code: [go]$$Bc Exercise for the reader - white to live $$ | . . . , . . . . . , . . . O X X X X . | $$ | . X X X . . O . . . . . . O O X X . . | $$ | . X O X O X . X X . . . . . . X . X . | $$ | . O O O X X . O X . X X O . O O X . . | $$ | . . . . . . . O X O . . . . . . X . . | $$ | . . . . X . X X O X X X X . O O X . . | $$ | . . O O O . . . O O O O . X X X X . . | $$ | . . X X O O O O . . . . . . . X O O . | $$ | . . . . X X X O . . . . . . X O . 2 1 | $$ | . . . . . . . . . . . . . . 3 . O . . | $$ ---------------------------------------[/go]

Although also it requires the marked spots to be free of black stones:

Click Here To Show Diagram Code: [go]$$Bc $$ | . . . , . . . . . , . . . O X X X X . | $$ | . X X X . . O . . . . . . O O X X . . | $$ | . X O X O X . X X . . . . . . X . X . | $$ | . O O O X X . O X . X X O . O O X C . | $$ | . . . . . . . O X O . . . . . . X C . | $$ | . . . . X . X X O X X X X . O O X C . | $$ | . . O O O . . . O O O O . X X X X . . | $$ | . . X X O O O O . . . . . . . X O O . | $$ | . . . . X X X O . . . . . . X O . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ ---------------------------------------[/go]

To also prevent this sequence:

Click Here To Show Diagram Code: [go]$$Bc $$ | . . . , . . . . . , . . . O X X X X . | $$ | . X X X . . O . . . . . . O O X X . . | $$ | . X O X O X . X X . . . . . . X . X . | $$ | . O O O X X . O X . X X O . O O X C . | $$ | . . . . . . . O X O . . . . . . X C . | $$ | . . . . X . X X O X X X X . O O X C . | $$ | . . O O O . . . O O O O . X X X X 4 5 | $$ | . . X X O O O O . . . . . . . X O O . | $$ | . . . . X X X O . . . . . . X O . 1 2 | $$ | . . . . . . . . . . . . . . . . O 3 . | $$ ---------------------------------------[/go]

Anyways, this means that the following push is very bad for white, because white's corner goes from alive to black being able to make a ko.

Click Here To Show Diagram Code: [go]$$Wc bad push $$ | . . . , . . . . . , . . . O X X X X . | $$ | . X X X . . O . . . . . . O O X X . . | $$ | . X O X O X . X X . . . . . . X . X . | $$ | . O O O X X . O X . X X O . O O X . . | $$ | . . . . . . . O X O . . . . . . X . . | $$ | . . . . X . X X O X X X X . O O X 2 . | $$ | . . O O O . . . O O O O . X X X X 1 . | $$ | . . X X O O O O . . . . . . . X O O . | $$ | . . . . X X X O . . . . . . X O . . . | $$ | . . . . . . . . . . . . . . . . O . . | $$ ---------------------------------------[/go]

jlt · **#48**

In fact you make me realize that Problem #15 is the tripod group with extra leg.

https://senseis.xmp.net/?TripodGroupWithExtraLeg

I had read this page before, but not carefully.

jlt · **#49**

Answer to problem #16:

jlt · **#50**

Problem #17, White to play. What is the status of the black group Q7?

Click Here To Show Diagram Code: [go]$$Wc White to play $$ --------------------------------------- $$ | . X . . . . . . . . . . . . . . . . . | $$ | O X O O . . . . . . . . . . . . . . . | $$ | . O X O . . . . . . . O X X X . . . . | $$ | O X X O . . . . X O . O X O . , X . . | $$ | X X X O . . . O O . O X O O O X . X . | $$ | . X O O . . . . . X . X X X O O X . . | $$ | . . X . . . . . . . . X . X . O O . . | $$ | . X . . . . . . X . X . X . X X O . . | $$ | . . . . . . . . . . X X O O O O O . . | $$ | . . O , . . . O . O X O O X . , . . . | $$ | . . . . . . . . . . O O X . X . X . . | $$ | . . . . . . . . . O O . O . . . . . . | $$ | . . . . . . . . . . X O . X . X X . . | $$ | . . . O . . . . . . . . O . X . X O . | $$ | . O O . . . . X X . . . . . . X O . O | $$ | . X X O . . . O . X . O . O O O O O . | $$ | . . X O . O . . . . X O . O X X X . . | $$ | X . X X O . . . . . . X X X . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Answer ?

Tsumegos from real games

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