Life In 19x19 :: L19 Go Problem Championship: Round 5

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

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

Variation: after B5, a and b miai

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

Variation:

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

Variation:

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

B3 & W4 fails:

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

However, with B3 white has strong resistance:

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

(Cont'd)

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

Variation:

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

Variation:

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

B fails

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

B fails

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

3.
Ko:

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

B5 fails:

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

W4 fails:

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

Variation:

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

Variation:

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

Variation:
After 7, a and b miai

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

Variation:

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

B3 fails

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

B fails

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

B fails

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

B fails

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

Hard to even know where to start here. Maybe with the right incursions, we can limit White to a dead eye-space near the marked points?

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

The a and b points are jumping out at me.

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

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

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

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

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

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

Author:	EdLee [ Sun Mar 19, 2017 11:35 pm ]
Post subject:
Click Here To Show Diagram Code `[go]$$B $$ -------------------- $$\| . O . X . . . . . . $$\| . X O X X X O . O . $$\| . X X O O O O . . . $$\| O O O , . . . . . , $$\| . . . . . . . . . .[/go]` Click Here To Show Diagram Code `[go]$$B (a), (b) miai life $$ -------------------- $$\| . O a X . b . . . . $$\| 1 X O X X X O . O . $$\| . X X O O O O . . . $$\| O O O , . . . . . , $$\| . . . . . . . . . .[/go]` Click Here To Show Diagram Code `[go]$$B ko for life $$ -------------------- $$\| . O 1 X . 3 . . . . $$\| 2 X O X X X O . O . $$\| . X X O O O O . . . $$\| O O O , . . . . . , $$\| . . . . . . . . . .[/go]` Click Here To Show Diagram Code `[go]$$B ko for life $$ -------------------- $$\| . O X X . X . . . . $$\| O X . X X X O . O . $$\| 4 X X O O O O . . . $$\| O O O , . . . . . , $$\| . . . . . . . . . .[/go]` Click Here To Show Diagram Code `[go]$$B $$---------------------- $$ . X . . . . O X X . \| $$ . X O . . X . O X . \| $$ . X O . O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` W lives: Click Here To Show Diagram Code `[go]$$B at $$---------------------- $$ . X . . 4 1 W X X . \| $$ . X O . 2 X 3 O X . \| $$ . X O 6 O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` Click Here To Show Diagram Code `[go]$$B $$---------------------- $$ . X . . 1 . O X X . \| $$ . X O . . X . O X . \| $$ . X O . O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` Click Here To Show Diagram Code `[go]$$B $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . . . . . O X . $$ \| . X . X O . O . . O X . $$ \| . X . . X . . . O . X . $$ \| . . X . . . . . O O X . $$ ------------------------[/go]`

Author:	Kirby [ Mon Mar 20, 2017 7:41 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 5
@EdLee: Problem 1 is correct.

Author:	mongus [ Tue Mar 21, 2017 5:19 am ]
Post subject:	Re: L19 Go Problem Championship: Round 5
Problem 1 : Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ \| . O 3 X . 2 . . . . $$ \| 1 X O X X X O . O . $$ \| . X X O O O O . . . $$ \| O O O , . . . . . , $$ \| . . . . . . . . . .[/go]`

Author:	hyperpape [ Tue Mar 21, 2017 11:17 am ]
Post subject:	Re: L19 Go Problem Championship: Round 5
Problem 1 Ko. Black takes first. Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ \| 5 O 3 X . 1 . . . . $$ \| 2 X O X X X O . O . $$ \| 4 X X O O O O . . . $$ \| O O O , . . . . . , $$ \| . . . . . . . . . .[/go]`

Author:	Kirby [ Tue Mar 21, 2017 2:27 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 5
mongus wrote: Problem 1 : Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ \| . O 3 X . 2 . . . . $$ \| 1 X O X X X O . O . $$ \| . X X O O O O . . . $$ \| O O O , . . . . . , $$ \| . . . . . . . . . .[/go]` @mongus: Correct!

Life In 19x19 http://www.lifein19x19.com/

L19 Go Problem Championship: Round 5 http://www.lifein19x19.com/viewtopic.php?f=15&t=14110	Page 1 of 2

Author:	Kirby [ Tue Mar 21, 2017 2:28 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 5
hyperpape wrote: Problem 1 Ko. Black takes first. Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ \| 5 O 3 X . 1 . . . . $$ \| 2 X O X X X O . O . $$ \| 4 X X O O O O . . . $$ \| O O O , . . . . . , $$ \| . . . . . . . . . .[/go]` @hyperpape: Good work! Can you get better than ko, now?

Author:	gamesorry [ Tue Mar 21, 2017 10:59 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 5
1. Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ \| . O . X . . . . . . $$ \| 1 X O X X X O . O . $$ \| . X X O O O O . . . $$ \| O O O , . . . . . , $$ \| . . . . . . . . . .[/go]` 2. Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X 5 3 4 . O X X . \| $$ . X O 2 1 X 6 O X . \| $$ . X O 7 O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` Variation: after B5, a and b miai Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X 5 3 a . O X X . \| $$ . X O 2 1 X 4 O X . \| $$ . X O b O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` Variation: Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X 4 3 6 . O X X . \| $$ . X O 2 1 X . O X . \| $$ . X O 5 O O O O X . \| $$ , X 7 X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` Variation: Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X . 3 . . O X X . \| $$ . X O 2 1 X 5 O X . \| $$ . X O 4 O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` B3 & W4 fails: Click Here To Show Diagram Code `[go]$$Bc 9=1 $$ -------------------- $$ . X 7 5 4 8 O X X . \| $$ . X O 2 1 X 6 O X . \| $$ . X O 3 O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` However, with B3 white has strong resistance: Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X 7 4 8 9 O X X . \| $$ . X O 2 1 X 6 O X . \| $$ . X O 3 O O O O X . \| $$ , X 5 X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` (Cont'd) Click Here To Show Diagram Code `[go]$$Wc $$ -------------------- $$ . X X 2 3 X O X X . \| $$ . X . 1 X X O O X . \| $$ . X . X O O O O X . \| $$ , X X X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` Variation: Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X . . . . O X X . \| $$ . X O . 1 X 3 O X . \| $$ . X O 2 O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` Variation: Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X 5 . . . O X X . \| $$ . X O 3 1 X 2 O X . \| $$ . X O 4 O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` B fails Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X . . 3 . O X X . \| $$ . X O 4 2 X . O X . \| $$ . X O 1 O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` B fails Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X 3 . 1 . O X X . \| $$ . X O . 4 X 2 O X . \| $$ . X O . O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` 3. Ko: Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . 4 . 5 9 O X . $$ \| . X . X O . O 8 . O X . $$ \| . X . . X 2 1 0 O . X . $$ \| . . X . . 3 6 7 O O X . $$ ------------------------[/go]` B5 fails: Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . 4 . 6 . O X . $$ \| . X . X O . O . . O X . $$ \| . X . . X 2 1 . O . X . $$ \| . . X . . 3 5 . O O X . $$ ------------------------[/go]` W4 fails: Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X 8 . 9 0 b O X . $$ \| . X . X O 4 O 6 a O X . $$ \| . X . . X 2 1 c O 7 X . $$ \| . . X . . 3 5 . O O X . $$ ------------------------[/go]` Variation: Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X 8 7 . 6 . O X . $$ \| . X . X O 4 O 9 . O X . $$ \| . X . . X 2 1 . O . X . $$ \| . . X . . 3 5 . O O X . $$ ------------------------[/go]` Variation: Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X 6 . . . . O X . $$ \| . X . X O 4 O 7 . O X . $$ \| . X . . X 2 1 . O . X . $$ \| . . X . . 3 5 . O O X . $$ ------------------------[/go]` Variation: After 7, a and b miai Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X 7 5 a 2 . O X . $$ \| . X . X O 4 O . b O X . $$ \| . X . . X 3 1 6 O . X . $$ \| . . X . . . . . O O X . $$ ------------------------[/go]` Variation: Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X 5 7 a 6 . O X . $$ \| . X . X O 4 O . b O X . $$ \| . X . . X 3 1 2 O . X . $$ \| . . X . . . . . O O X . $$ ------------------------[/go]` B3 fails Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . 4 . 6 . O X . $$ \| . X . X O 3 O . . O X . $$ \| . X . . X 5 1 2 O . X . $$ \| . . X . . . . . O O X . $$ ------------------------[/go]` B fails Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X 6 . 7 5 . O X . $$ \| . X . X O 4 O 3 . O X . $$ \| . X . . X 1 2 . O . X . $$ \| . . X . . . 8 . O O X . $$ ------------------------[/go]` B fails Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X 5 a . 6 . O X . $$ \| . X . X O 4 O 3 b O X . $$ \| . X . . X 1 2 . O . X . $$ \| . . X . . . . . O O X . $$ ------------------------[/go]` B fails Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . . . . . O X . $$ \| . X . X O 3 O 4 . O X . $$ \| . X . . X 1 2 . O . X . $$ \| . . X . . . . . O O X . $$ ------------------------[/go]`

Author:	hyperpape [ Wed Mar 22, 2017 6:24 am ]
Post subject:	Re: L19 Go Problem Championship: Round 5
Problem 1 redux: Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ \| c O a X . b . . . . $$ \| 1 X O X X X O . O . $$ \| . X X O O O O . . . $$ \| O O O , . . . . . , $$ \| . . . . . . . . . .[/go]` a and b are miai. Black either makes an eye to the left of b or two eyes from captures at a and c.

Author:	Kirby [ Wed Mar 22, 2017 8:47 am ]
Post subject:	Re: L19 Go Problem Championship: Round 5
@gamesorry: Problems 1 and 2 are correct. For Problem 3, did you consider this? Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . . . . . O X . $$ \| . X . X O . O 2 . O X . $$ \| . X . . X . 1 . O . X . $$ \| . . X . . . . . O O X . $$ ------------------------[/go]`

Author:	Kirby [ Wed Mar 22, 2017 8:48 am ]
Post subject:	Re: L19 Go Problem Championship: Round 5
@hyperpape: You've got it! Good work

Author:	hyperpape [ Wed Mar 22, 2017 7:46 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 5
Problem 2: This one was funny, at least if I've managed to get it right. It was pretty easy to see that a, b, and c fail, so I was looking at d. Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X . . . a O X X . \| $$ . X O c d X b O X . \| $$ . X O . O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X . 5 4 . O X X . \| $$ . X O 2 1 X 6 O X . \| $$ . X O 3 O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` For the longest time, I had read this far, but couldn't see that made a false eye after B connects. I had to set up a board to see that there's a throw-in.

Author:	Kirby [ Wed Mar 22, 2017 9:45 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 5
hyperpape wrote: Problem 2: This one was funny, at least if I've managed to get it right. It was pretty easy to see that a, b, and c fail, so I was looking at d. Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X . . . a O X X . \| $$ . X O c d X b O X . \| $$ . X O . O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X . 5 4 . O X X . \| $$ . X O 2 1 X 6 O X . \| $$ . X O 3 O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` For the longest time, I had read this far, but couldn't see that made a false eye after B connects. I had to set up a board to see that there's a throw-in. @hyperpape: Did you consider this move? Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X . 4 . . O X X . \| $$ . X O 2 1 X . O X . \| $$ . X O 3 O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` Hint: You are pretty close.

Author:	hyperpape [ Thu Mar 23, 2017 8:07 am ]
Post subject:	Re: L19 Go Problem Championship: Round 5
Kirby wrote: @hyperpape: [hide]Did you consider this move? Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X . 4 . . O X X . \| $$ . X O 2 1 X . O X . \| $$ . X O 3 O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` Not in detail. I think I figured that there weren't enough liberties. So the issue is this under the stones play? Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X 3 O 4 5 O X X . \| $$ . X O O X X 2 O X . \| $$ . X O X O O O O X . \| $$ , X 1 X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` Maybe if we change the order of moves? Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X 4 3 6 . O X X . \| $$ . X O 2 1 X . O X . \| $$ . X O 5 O O O O X . \| $$ , X 7 X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` White can try the throw in. Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X 5 3 4 . O X X . \| $$ . X O 2 1 X 6 O X . \| $$ . X O . O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]` But we're back to Black being able to make the eye false. Click Here To Show Diagram Code `[go]$$Bc $$ -------------------- $$ . X 7 3 4 . O X X . \| $$ . X O 2 1 X 6 O X . \| $$ . X O 5 O O O O X . \| $$ , X . X X O , O X . \| $$ . X . . . O O X . . \| $$ . . . . X X X X . . \| $$ . . . . . . . . . . \|[/go]`

Author:	Kirby [ Thu Mar 23, 2017 9:56 am ]
Post subject:	Re: L19 Go Problem Championship: Round 5
@hyperpape: Yup! The under-the-stones trick was the thing to watch out for, and you found it. Changing the order of moves fixes the problem, and solves it. You're on a roll.

Author:	Kirby [ Fri Mar 24, 2017 11:13 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 5
Solutions and updated leader board are given below. Problem 1 Problem 2 Problem 3 Leaderboard gamesorry - 82 Shaddy - 49 Schachus - 43 EdLee - 38 dfan - 25 Lanrose - 16 hyperpape - 15 jeromie - 13 mongus - 10

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Author:	Kirby [ Thu Mar 23, 2017 8:02 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 5
Since we started a bit late this week, I'll wait until about 24 hours from now to post solutions.

Author:	hyperpape [ Fri Mar 24, 2017 6:33 am ]
Post subject:	Re: L19 Go Problem Championship: Round 5
Problem 3 Hard to even know where to start here. Maybe with the right incursions, we can limit White to a dead eye-space near the marked points? Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . . . M M O X . $$ \| . X . X O . O M M O X . $$ \| . X . . X . . M O . X . $$ \| . . X . . . . . O O X . $$ ------------------------[/go]` The a and b points are jumping out at me. Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . . . . . O X . $$ \| . X . X O . O a . O X . $$ \| . X . . X ..b . O . X . $$ \| . . X . . . . . O O X . $$ ------------------------[/go]` Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . 3 4 . . O X . $$ \| . X . X O . O 1 . O X . $$ \| . X . . X 2 . 5 O . X . $$ \| . . X . . . . . O O X . $$ ------------------------[/go]` Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . . . 4 . O X . $$ \| . X . X O 6 O 1 5 O X . $$ \| . X . . X 3 . 2 O . X . $$ \| . . X . . . . . O O X . $$ ------------------------[/go]` Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . 3 4 . . O X . $$ \| . X . X O . O 1 . O X . $$ \| . X . . X 2 . 5 O . X . $$ \| . . X . . . . . O O X . $$ ------------------------[/go]` Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . 5 7 4 . O X . $$ \| . X . X O 3 O . 6 O X . $$ \| . X . . X . 1 2 O . X . $$ \| . . X . . . . . O O X . $$ ------------------------[/go]` Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . 4 . 6 . O X . $$ \| . X . X O 3 O . . O X . $$ \| . X . . X 5 1 2 O . X . $$ \| . . X . . . . . O O X . $$ ------------------------[/go]`

Author:	gamesorry [ Fri Mar 24, 2017 6:44 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 5
Kirby wrote: @gamesorry: For Problem 3, did you consider this? Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . . . . . O X . $$ \| . X . X O . O 2 . O X . $$ \| . X . . X . 1 . O . X . $$ \| . . X . . . . . O O X . $$ ------------------------[/go]` Oops, I overlooked that. So after 2 B has to play 3, but after W4B5, W has 6 and 8 Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X 5 3 . . . O X . $$ \| . X . X O 4 O 2 . O X . $$ \| . X . . X 6 1 . O . X . $$ \| . . X . . 7 8 . O O X . $$ ------------------------[/go]` Therefore, to prevent 6 and 8, B need to consider something like: Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X 5 3 . . . O X . $$ \| . X . X O 4 O 2 . O X . $$ \| . X . . X 9 6 . O . X . $$ \| . . X . . 8 1 7 O O X . $$ ------------------------[/go]` B still needs to be careful: B3 fails Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . 6 . 4 8 O X . $$ \| . X . X O . O 3 5 O X . $$ \| . X . . X . 2 7 O . X . $$ \| . . X . . . 1 . O O X . $$ ------------------------[/go]` Therefore, B3 should: Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . 3 . . . O X . $$ \| . X . X O . O 4 . O X . $$ \| . X . . X . 2 . O . X . $$ \| . . X . . . 1 5 O O X . $$ ------------------------[/go]` (Please deduct at least half of the points even if this is correct.)

Author:	gamesorry [ Fri Mar 24, 2017 11:51 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 5
Ah, I excluded the correct answer in the beginning due to the following W2: Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . . $$ \| . . . . . . . . . . . . $$ \| . . . . . X X X X . . . $$ \| . . . . X O O O O X X . $$ \| . . . X . 1 . . . O X . $$ \| . X . X O . O 2 . O X . $$ \| . X . . X a b . O . X . $$ \| . . X . . . c . O O X . $$ ------------------------[/go]` a and b obviously do not work, but actually c works. However, playing c first doesn't work. Nice problem!