Life In 19x19

Posted: **Mon Apr 24, 2017 8:46 pm**

Welcome to Round 10 of the L19 Go Problem Championship.

All problems are black to play. As usual, provide your solutions either via hide tags, or direct private message to me.

Problem 1 (3 points)

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

Problem 2 (6 points)

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

Problem 3 (9 points)

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

Have fun!

Posted: **Mon Apr 24, 2017 11:55 pm**

Posted: **Tue Apr 25, 2017 12:36 am**

@ EdLee:

Posted: **Tue Apr 25, 2017 3:17 am**

Cassandra:

Posted: **Tue Apr 25, 2017 7:14 am**

@EdLee:

Posted: **Fri Apr 28, 2017 9:11 pm**

1. Golden Chicken Standing on One Leg ("金鸡独立")

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

2.
The first intuition is

Click Here To Show Diagram Code: [go]$$Bc $$ -------------------- $$ . . O . . . . . . | $$ . X X O . 1 O X X | $$ . . . O . . O O X | $$ . X X O . X O X . | $$ . . . O O O X . . | $$ . . X X X X . X . | $$ . . . . . . . . . |[/go]

However, W can resist at :4 and then make a ko:

Click Here To Show Diagram Code: [go]$$Bc $$ -------------------- $$ . . O . 0 7 3 6 9 | $$ . X X O 5 1 O X X | $$ . . . O 8 2 O O X | $$ . X X O 4 X O X . | $$ . . . O O O X . . | $$ . . X X X X . X . | $$ . . . . . . . . . |[/go]

So B should destroy W's eye shape first:

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

3.
The intuition is a ko:

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

Variation:

Click Here To Show Diagram Code: [go]$$Bc $$ | . . . . . . . . $$ | . X X X X . . . $$ | X O . , . X . . $$ | 6 O 7 O . X . . $$ | 5 O 1 . O X X . $$ | . 3 2 4 . O X . $$ ----------------[/go]

Posted: **Sun Apr 30, 2017 10:12 pm**

@gamesorry:

Posted: **Sun Apr 30, 2017 10:16 pm**

Solutions and updated leader board are given below.

Problem 1

Problem 2

Problem 3

Leaderboard

gamesorry - 120
EdLee - 75
dfan - 70
Schachus - 68
Shaddy - 49
hyperpape - 26
mongus - 19
Lanrose - 16
jeromie - 13

Life In 19x19

L19 Go Problem Championship: Round 10

L19 Go Problem Championship: Round 10

Re:

Re: L19 Go Problem Championship: Round 10

Re: L19 Go Problem Championship: Round 10

Re: L19 Go Problem Championship: Round 10

Re: L19 Go Problem Championship: Round 10