[go]$$Bc $$ ------------------ $$ | . O . . . . X . . $$ | X O O . . O X . . $$ | O O X O O X X . . $$ | . X X X X . . . . $$ | . . . . . . . . .[/go]
Problem 2 (6 points)
$$Bc $$ -------------------- $$ . . . X O O . . O . | $$ . . O O X . . X . X | $$ . . O X X X X O X . | $$ , . O . . . , O X . | $$ . . . . O O . O O . | $$ . . . . . . . . . . |
[go]$$Bc $$ -------------------- $$ . . . X O O . . O . | $$ . . O O X . . X . X | $$ . . O X X X X O X . | $$ , . O . . . , O X . | $$ . . . . O O . O O . | $$ . . . . . . . . . . |[/go]
Problem 3 (9 points)
$$Bc $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . . . . . . . $$ | . . O O X X X . X X . . . $$ | . O X X O O O . O . . . . $$ | . O X O X . . . . , O . . $$ | . . X O . . . . . X . O . $$ | O . X O . . . . . . X . . $$ | . . . . . . . . . . . . . $$ --------------------------
[go]$$Bc $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . . . . . . . $$ | . . O O X X X . X X . . . $$ | . O X X O O O . O . . . . $$ | . O X O X . . . . , O . . $$ | . . X O . . . . . X . O . $$ | O . X O . . . . . . X . . $$ | . . . . . . . . . . . . . $$ --------------------------[/go]
Have fun!
Posted: Mon May 29, 2017 8:52 pm
by EdLee
$$B $$ ------------------- $$ | . O . 1 2 3 X . . $$ | X O O . . O X . . $$ | O O X O O X X . . $$ | . X X X X . . . . $$ | . . . . . . . . .
[go]$$B $$ ------------------- $$ | . O . 1 . 3 X . . $$ | X O O 2 . O X . . $$ | O O X O O X X . . $$ | . X X X X . . . . $$ | . . . . . . . . .[/go]
$$B $$ --------------------- $$ . . . X O O 1 . O . | $$ . . O O X . . X . X | $$ . . O X X X X O X . | $$ , . O . . . , O X . | $$ . . . . O O . O O . | $$ . . . . . . . . . . |
[go]$$B $$ --------------------- $$ . . . X O O 1 . O . | $$ . . O O X . . X . X | $$ . . O X X X X O X . | $$ , . O . . . , O X . | $$ . . . . O O . O O . | $$ . . . . . . . . . . |[/go]
Re: L19 Go Problem Championship: Round 14
Posted: Tue May 30, 2017 8:25 am
by Shaddy
Problem 1 (3 points)
$$Bc $$ ------------------ $$ | . O . 1 . . X . . $$ | X O O . . O X . . $$ | O O X O O X X . . $$ | . X X X X . . . . $$ | . . . . . . . . .
[go]$$Bc $$ ------------------ $$ | . O . 1 . . X . . $$ | X O O . . O X . . $$ | O O X O O X X . . $$ | . X X X X . . . . $$ | . . . . . . . . .[/go]
Problem 2 (6 points)
$$Bc $$ -------------------- $$ . . . X 5 . 1 . O . | $$ . . O O X 3 . X 2 X | $$ . . O X X X X O X . | $$ , . O . . . , O X 4 | $$ . . . . O O . O O . | $$ . . . . . . . . . . |
[go]$$Bc $$ -------------------- $$ . . . X 5 . 1 . O . | $$ . . O O X 3 . X 2 X | $$ . . O X X X X O X . | $$ , . O . . . , O X 4 | $$ . . . . O O . O O . | $$ . . . . . . . . . . |[/go]
Problem 3 (9 points)
$$Bc $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . . . . . . . $$ | . . O O X X X . X X . . . $$ | . O X X O O O 7 O . . . . $$ | . O X O X 5 8 0 . , O . . $$ | . . X O 2 3 9 . . X . O . $$ | O . X O 1 6 . . . . X . . $$ | . . . 4 . . . . . . . . . $$ --------------------------
[go]$$Bc $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . . . . . . . $$ | . . O O X X X . X X . . . $$ | . O X X O O O 7 O . . . . $$ | . O X O X 5 8 0 . , O . . $$ | . . X O 2 3 9 . . X . O . $$ | O . X O 1 6 . . . . X . . $$ | . . . 4 . . . . . . . . . $$ --------------------------[/go]
Problem 3 (9 points)
$$Bc $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . 9 . . . . . $$ | . . O O X X X 2 X X . . . $$ | . O X X O O O 4 O 0 a . . $$ | . O X O X X O O 3 b O c . $$ | . . X O O X X 1 5 X d O e $$ | O . X O X O . . . 6 X f . $$ | . . . O 8 . . . . 7 . g . $$ --------------------------
[go]$$Bc $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . 9 . . . . . $$ | . . O O X X X 2 X X . . . $$ | . O X X O O O 4 O 0 a . . $$ | . O X O X X O O 3 b O c . $$ | . . X O O X X 1 5 X d O e $$ | O . X O X O . . . 6 X f . $$ | . . . O 8 . . . . 7 . g . $$ --------------------------[/go]
5 is a minor tesuji. 6 is pure magic.
Keep pulling problems from Fa Yang Lun, please
Re: L19 Go Problem Championship: Round 14
Posted: Tue May 30, 2017 9:34 am
by Kirby
@EdLee:
Problem 1 is correct.
Re: L19 Go Problem Championship: Round 14
Posted: Tue May 30, 2017 9:38 am
by Kirby
@Shaddy:
Problems 1 and 3 are correct. I agree that is amazing. I heard that Dosaku came up with this move.
For Problem 2, do you have a response to this?
$$B $$ --------------------- $$ . . 2 C O O 1 . O . | $$ . . O O X . . X . X | $$ . . O X X X X O X . | $$ , . O . . . , O X . | $$ . . . . O O . O O . | $$ . . . . . . . . . . |
[go]$$B $$ --------------------- $$ . . 2 C O O 1 . O . | $$ . . O O X . . X . X | $$ . . O X X X X O X . | $$ , . O . . . , O X . | $$ . . . . O O . O O . | $$ . . . . . . . . . . |[/go]
Re: L19 Go Problem Championship: Round 14
Posted: Tue May 30, 2017 10:52 am
by Marcus
Oh, hey, I wonder if I can still do these. Quick shot at it:
Problem 1:
$$Bc $$ ------------------ $$ | . O . 1 3 5 X . . $$ | X O O 2 4 O X . . $$ | O O X O O X X . . $$ | . X X X X . . . . $$ | . . . . . . . . .
[go]$$Bc $$ ------------------ $$ | . O . 1 3 5 X . . $$ | X O O 2 4 O X . . $$ | O O X O O X X . . $$ | . X X X X . . . . $$ | . . . . . . . . .[/go]
Problem 2:
$$Bc Best I could come up with $$ -------------------- $$ . . . X 7 C 1 5 O . | $$ . . O O X 3 . X 4 X | $$ . . O X X X X O C 6 | $$ , . O . . . , O C 2 | $$ . . . . O O . O O . | $$ . . . . . . . . . . |
[go]$$Bc Best I could come up with $$ -------------------- $$ . . . X 7 C 1 5 O . | $$ . . O O X 3 . X 4 X | $$ . . O X X X X O C 6 | $$ , . O . . . , O C 2 | $$ . . . . O O . O O . | $$ . . . . . . . . . . |[/go]
Problem 3: Nifty Ladder?
$$Bc $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . . . . . . . $$ | . . O O X X X . X X . . . $$ | . O X X O O O 7 O . . . . $$ | . O X O 6 4 8 0 . , O . . $$ | . . X O 2 3 9 . . X . O . $$ | O . X O 1 . . . . . X . . $$ | . . . 5 . . . . . . . . . $$ --------------------------
[go]$$Bc $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . . . . . . . $$ | . . O O X X X . X X . . . $$ | . O X X O O O 7 O . . . . $$ | . O X O 6 4 8 0 . , O . . $$ | . . X O 2 3 9 . . X . O . $$ | O . X O 1 . . . . . X . . $$ | . . . 5 . . . . . . . . . $$ --------------------------[/go]
$$Bcm11 $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . 7 . . . . . $$ | . . O O X X X 4 X X . . . $$ | . O X X O O O 6 O 8 9 . . $$ | . O X O W W W W 1 0 O . . $$ | . . X O W B B 2 5 X . O . $$ | O . X O B . . 3 . . X . . $$ | . . . B . . . . . . . . . $$ --------------------------
[go]$$Bcm11 $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . 7 . . . . . $$ | . . O O X X X 4 X X . . . $$ | . O X X O O O 6 O 8 9 . . $$ | . O X O W W W W 1 0 O . . $$ | . . X O W B B 2 5 X . O . $$ | O . X O B . . 3 . . X . . $$ | . . . B . . . . . . . . . $$ --------------------------[/go]
$$Bcm21 $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . B . . . . . $$ | . . O O X X X W X X . . . $$ | . O X X O O O W O W B . . $$ | . O X O W W W W B W O 1 . $$ | . . X O W B B W B X 2 O 3 $$ | O . X O B . . B . . X 4 5 $$ | . . . B . . . . . . . 6 7 $$ --------------------------
[go]$$Bcm21 $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . B . . . . . $$ | . . O O X X X W X X . . . $$ | . O X X O O O W O W B . . $$ | . O X O W W W W B W O 1 . $$ | . . X O W B B W B X 2 O 3 $$ | O . X O B . . B . . X 4 5 $$ | . . . B . . . . . . . 6 7 $$ --------------------------[/go]
Re: L19 Go Problem Championship: Round 14
Posted: Tue May 30, 2017 9:27 pm
by Shaddy
Kirby wrote:@Shaddy:
Problems 1 and 3 are correct. I agree that is amazing. I heard that Dosaku came up with this move.
For Problem 2, do you have a response to this?
$$B $$ --------------------- $$ . . 2 C O O 1 . O . | $$ . . O O X . . X . X | $$ . . O X X X X O X . | $$ , . O . . . , O X . | $$ . . . . O O . O O . | $$ . . . . . . . . . . |
[go]$$B $$ --------------------- $$ . . 2 C O O 1 . O . | $$ . . O O X . . X . X | $$ . . O X X X X O X . | $$ , . O . . . , O X . | $$ . . . . O O . O O . | $$ . . . . . . . . . . |[/go]
Ugh, of course it should be the other atari first, then after w captures make an eye. It's ko.
Re: L19 Go Problem Championship: Round 14
Posted: Sat Jun 03, 2017 12:29 pm
by gamesorry
1.
$$Bc $$ ------------------ $$ | . O . 1 3 . X . . $$ | X O O . 2 O X . . $$ | O O X O O X X . . $$ | . X X X X . . . . $$ | . . . . . . . . .
[go]$$Bc $$ ------------------ $$ | . O . 1 3 . X . . $$ | X O O . 2 O X . . $$ | O O X O O X X . . $$ | . X X X X . . . . $$ | . . . . . . . . .[/go]
2. Ko
$$Bc $$ -------------------- $$ . . 2 X O O 5 4 O . | $$ . . O O X 1 . X . X | $$ . . O X X X X O X . | $$ , . O . . . , O X 3 | $$ . . . . O O . O O . | $$ . . . . . . . . . . |
[go]$$Bc $$ -------------------- $$ . . 2 X O O 5 4 O . | $$ . . O O X 1 . X . X | $$ . . O X X X X O X . | $$ , . O . . . , O X 3 | $$ . . . . O O . O O . | $$ . . . . . . . . . . |[/go]
Variation: B fails
$$Bc $$ -------------------- $$ . . 2 4 O O 1 . O . | $$ . . O O X 3 . X 6 X | $$ . . O X X X X O X . | $$ , . O . . . , O X 5 | $$ . . . . O O . O O . | $$ . . . . . . . . . . |
[go]$$Bc $$ -------------------- $$ . . 2 4 O O 1 . O . | $$ . . O O X 3 . X 6 X | $$ . . O X X X X O X . | $$ , . O . . . , O X 5 | $$ . . . . O O . O O . | $$ . . . . . . . . . . |[/go]
Variation: B fails
$$Bc $$ -------------------- $$ . . . X O O . . O . | $$ . . O O X . . X 1 X | $$ . . O X X X X O X . | $$ , . O . . . , O X 2 | $$ . . . . O O . O O . | $$ . . . . . . . . . . |
[go]$$Bc $$ -------------------- $$ . . . X O O . . O . | $$ . . O O X . . X 1 X | $$ . . O X X X X O X . | $$ , . O . . . , O X 2 | $$ . . . . O O . O O . | $$ . . . . . . . . . . |[/go]
Variation: B fails
$$Bc $$ -------------------- $$ . . 4 X O O 3 1 O . | $$ . . O O X . . X . X | $$ . . O X X X X O X . | $$ , . O . . . , O X 2 | $$ . . . . O O . O O . | $$ . . . . . . . . . . |
[go]$$Bc $$ -------------------- $$ . . 4 X O O 3 1 O . | $$ . . O O X . . X . X | $$ . . O X X X X O X . | $$ , . O . . . , O X 2 | $$ . . . . O O . O O . | $$ . . . . . . . . . . |[/go]
3. B1 should be the only move, however I couldn't figure out a way to capture w so far:
$$Bc $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . . . . . . . $$ | . . O O X X X . X X . . . $$ | . O X X O O O 7 O . . . . $$ | . O X O 6 4 8 9 e , O . . $$ | . . X O 2 3 0 b d X . O . $$ | O . X O 1 h a c f . X . . $$ | . . . 5 . . . . g . . . . $$ --------------------------
[go]$$Bc $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . . . . . . . $$ | . . O O X X X . X X . . . $$ | . O X X O O O 7 O . . . . $$ | . O X O 6 4 8 9 e , O . . $$ | . . X O 2 3 0 b d X . O . $$ | O . X O 1 h a c f . X . . $$ | . . . 5 . . . . g . . . . $$ --------------------------[/go]
Variation:
$$Bc $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . e . . . . . $$ | . . O O X X X b X X . . . $$ | . O X X O O O 7 O f g . . $$ | . O X O 6 4 8 0 a h O i . $$ | . . X O 2 3 9 c n X j O k $$ | O . X O 1 . . . . . X l m $$ | . . . 5 . . . . . . . . . $$ --------------------------
[go]$$Bc $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . e . . . . . $$ | . . O O X X X b X X . . . $$ | . O X X O O O 7 O f g . . $$ | . O X O 6 4 8 0 a h O i . $$ | . . X O 2 3 9 c n X j O k $$ | O . X O 1 . . . . . X l m $$ | . . . 5 . . . . . . . . . $$ --------------------------[/go]
Re: L19 Go Problem Championship: Round 14
Posted: Sun Jun 04, 2017 5:58 am
by Shaddy
Problem 3 is not to capture White, but to save the 5 black stones.
Re: L19 Go Problem Championship: Round 14
Posted: Mon Jun 05, 2017 6:14 am
by unkx80
Marcus wrote:
$$Bcm11 $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . 7 . . . . . $$ | . . O O X X X 4 X X . . . $$ | . O X X O O O 6 O 8 9 . . $$ | . O X O W W W W 1 0 O . . $$ | . . X O W B B 2 5 X . O . $$ | O . X O B . . 3 . . X . . $$ | . . . B . . . . . . . . . $$ --------------------------
[go]$$Bcm11 $$ | . . . . . . . . . . . . . $$ | . . . O . . . . . . . . . $$ | . . . . . . . 7 . . . . . $$ | . . O O X X X 4 X X . . . $$ | . O X X O O O 6 O 8 9 . . $$ | . O X O W W W W 1 0 O . . $$ | . . X O W B B 2 5 X . O . $$ | O . X O B . . 3 . . X . . $$ | . . . B . . . . . . . . . $$ --------------------------[/go]
Your ladder won't work if W12 is played at W14.
Re: L19 Go Problem Championship: Round 14
Posted: Mon Jun 05, 2017 9:45 pm
by Kirby
@Marcus:
See unkx80's comment regarding problem 3. Regarding Problem 2:
$$Bc Best I could come up with $$ -------------------- $$ . . 2 C O O 1 . O . | $$ . . O O X . . X . X | $$ . . O X X X X O X . | $$ , . O . . . , O X . | $$ . . . . O O . O O . | $$ . . . . . . . . . . |
[go]$$Bc Best I could come up with $$ -------------------- $$ . . 2 C O O 1 . O . | $$ . . O O X . . X . X | $$ . . O X X X X O X . | $$ , . O . . . , O X . | $$ . . . . O O . O O . | $$ . . . . . . . . . . |[/go]
Re: L19 Go Problem Championship: Round 14
Posted: Mon Jun 05, 2017 9:46 pm
by Kirby
@gamesorry:
Correct on problems 1 and 2. I hope Shaddy's clarification on problem 3 helped.
Re: L19 Go Problem Championship: Round 14
Posted: Mon Jun 05, 2017 9:52 pm
by Kirby
Solutions and updated leader board are given below.
Problem 1
(;GM[1]FF[4]CA[UTF-8]AP[WebGoBoard:0.10.8]ST[0]SZ[19]KM[6.5]HA[0]PB[Black]PW[White]AB[ab][ga][gb][gc][fc][ed][dd][cd][bd][cc]AW[ac][bc][bb][ba][cb][dc][ec][fb]C[Problem 1: Black kills white.](;B[db]C[Playing at D18 is too hasty.];W[eb];B[ea];W[da];B[fa];W[db]C[White is alive.])(;B[da](;W[ea];B[fa];W[db];B[eb]C[White is captured.])(;W[eb];B[fa];W[db];B[ea]C[White is captured.])))
Problem 2
(;GM[1]FF[4]CA[UTF-8]AP[WebGoBoard:0.10.8]ST[0]SZ[19]KM[6.5]HA[0]PB[Black]PW[White]AB[sb][rc][rd][qb][pc][oc][nc][mc][nb][ma]AW[na][oa][ra][qc][qd][qe][re][oe][ne][ld][lc][lb][mb]C[Problem 2: Black gets ko.](;B[pa]C[Q19 looks like a nice shape, but it's wrong.];W[la](;B[sd];W[rb]C[Black is dead.])(;B[ob]C[If black plays P18...](;W[rb];B[ma]C[It appears that white could live.])(;W[ma];B[sd];W[rb]C[Black is dead.])))(;B[ob]C[P18 is the correct answer.];W[la](;B[sd];W[qa];B[pa]C[Back gets ko - this is the best result black can expect.])(;B[pa]C[Black should avoid playing Q19.];W[ma];B[sd];W[rb]C[Black dies.])))
Problem 3
(;GM[1]FF[4]CA[UTF-8]AP[WebGoBoard:0.10.8]ST[0]SZ[19]KM[6.5]HA[0]PB[Black]PW[White]AB[do][co][cp][cq][cr][ep][en][fn][gn][in][jn][jq][kr]AW[ar][bp][bo][cn][dn][dl][dp][dq][dr][eo][fo][go][io][kp][lq]C[Problem 3: Black gets a suprising ko, due to an amazing move by white.];B[er]C[Black E2 is the right way to start.];W[eq]C[White pushes through to avoid immediate capture.];B[fq](;W[ds](;B[fp]C[Connecting with F4 is the answer.];W[fr]C[White can increase liberties, but...];B[ho];W[gp];B[gq];W[hp];B[hq];W[hn];B[iq](;W[bq]C[If white tries to capture black immediately it doesn't work.];B[ip];W[ho];B[hm];W[jo];B[ko]C[Black has ladder!];W[jp];B[lp];W[kq];B[mq]C[White is captured.])(;W[hm]C[If white tries to move out and escape...];B[fs]C[Black F1 kills white.];W[es];B[gs]C[White doesn't have enough liberties, and dies.])(;W[jr]C[White's move at K2 was discovered by Dosaku!](;B[js]C[Black has no choice but to play ko.];W[bq];B[ip];W[ho];B[hm];W[jo];B[ko];W[jp];B[lp];W[kq];B[mq];W[lr];B[ls]C[Now, it's no longer a ladder. Wite's move at K2 set up the situation for a ko!
This is the best for both sides.];W[ks])(;B[ks]C[Black L1 doesn't work.];W[js]C[Black loses the stones at C3.])))(;B[es]C[Black E1 is a mistake.];W[fp];B[cs];W[ep];B[ho];W[gp]C[Black has no real followup.]))(;W[fp]C[White F4 is a mistake (if white doesn't have enough ko threats), and allows black to save his stones easily.];B[ds];W[ep];B[ho];W[gp];B[gq];W[hp];B[ip];W[hn];B[hq]C[Black lives with a lot of points - in sente.]))
is amazing. I heard that Dosaku came up with this move.