Life In 19x19

I've extended what I mentioned above as potentially the correct line. I also added Ed's suggested possibilities as variations. I'm not a strong player, so if anyone can see a flaw, please speak up.

And if this problem is really in the "Elementary" section, then I need to go back to just playing tic ...

I just downloaded 围棋练习大全, a Chinese tesuji, tsumego, and joseki app. On the positive side, there are a lot of problems -- 320 tesuji and 735x3 elementary-/middle-/upper-level life and death problems. On the negative side, I don't think you can see the solution unless you get it (probably better for ...

Krama $$B B to play: Letter 'i' - 5-dan level
$$ | . . . . . . . . . . .
$$ | . O . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | 5 O O O . . . . . . .
$$ | 2 X . . O . . . . . .
$$ | 3 a 6 , . O . . . , .
$$ | 4 X 1 . . O . . . . .
$$ | O X O b . O . . . . .
$$ | . X O ...

Bill,

Ahem ... two weeks the ago, the AGA's Problem Of The Week guy published the same basic problem from the Gokyo Seimyo:
http://www.usgo.org/problem/seeing-move-too-far

Enjoy this problem from another Japanese tsumego book and good luck.

$$Bc Black to kill. Ko is not acceptable
$$ ----------------+
$$ . . X X . . . . |
$$ . . X O . O . . |
$$ . . X O . . . . |
$$ . . X X O . . . |
$$ . . . . X O . O |
$$ . . . . X . . O |
$$ . . . . . X X X ...

Black seems to have 4 straightforward inside forcing moves to limit White to one eye. Maybe White can give up some stones to live small, but I don't see how.

White has many center moves that quickly lead nowhere. Only one move seems to give White any chance, although I'm sure I'm missing Black's best defense.

Nice problem, tchan. Thanks!

(;AB[dr][cq][dp][do][co][cn][dm][em][en][di][ci][bi][bh][ei][eh][eg][fj][gj][cd][gc][jd][kb][jg][jj][mh][ph][pi ...

BobC, just based on the 2 problems you've given so far, I think I would like your book a lot!

(;
AB[cm][jo][dp][cq][jq][cr]
AW[dj][fo][dq][eq][hq]
C[Black plays.];
B[en]
C[This calm move separates the lower group from the left side stone, strengthens Black's lower left side, and now threatens ...

Be sure to remember that when a similar position arises in your AGA tournament games this weekend, that Black dies. The American Go Association rules have situational superko, which prohibits Black from repeating the position that Black 7 creates in HermanHiddema's diagram above.

For an otherwise excellent problem, a minor issue is that under AGA or Chinese rules, Black wins.

From the original position, Black defends. Under AGA rules, White then gives Black a pass stone, whereupon Black has 27 points, White has 26 points before komi. Under Chinese rules, Black's defending ...

I'm the last person to ask about tesuji problems, but Shaddy's solution to the bottom problem seems flawed.

(;SZ[19]GN[]PC[http://lifein19x19.com/]DT[2011-09-04]PL[W]AB[gp][hp][ip][eq][fq][iq][dr]AW[do][ep][fp][cq][dq][gq][hq][br]C[White plays]

(;W[hs]C[Shaddy's suggestion, but ...];B[gr ...

Aurik, your refutation is correct! I missed that Black's outside stones would have a shortage of liberties. Ugh.

Anyway, I'll try once more to show what solution theme Bill probably had in mind, and then I'll go hide in a cave.


(;
AB[ab][bb][db][eb][fb][gb][ib][bc][ec][ed][id][be][ce][ee][ge ...

One move seems to make Black miai of living and creating an extra outside liberty for the corner semeai.

Because I'm probably incorrect (such is the life of a weak kyu player), I've only included a couple sequences to show the idea.

In any event, thanks for yet another nice problem, Bill!

&#40 ...

Nice problem. Thanks Bill!

I was always off by a point, because I missed the required White prophylactic in the lower right corner. Dagnabbit.