Knotwilg's practice

Knotwilg · Post by **Knotwilg** » Mon Sep 05, 2016 7:55 am

Hitachi go problems, elementary level

1) throw in
2) vital point
3) capture three to make an eye
4) diagonal play on the first line tesuji
5) 1-1 ko
6) bulky 5 vital point
7) shortage of liberties | strange things happen at the 1-2 point
8) ko
9) vital point
10) diagonal play on the first line tesuji
11) throw in for ko | strange ...
12) ko | strange
13) shortage | strange
14) throw in | strange
15) placemen & throw in
16) vital point
17) miai
18) crane's nest
19) shortage
20) maximize eye space
21) death in the hane
22) maximize
23) attachment
24) death in the hane

Knotwilg · Post by **Knotwilg** » Mon Sep 05, 2016 1:12 pm

25) strange things ...
26) throw in
27) centre of 3
28) strange things
29) diagonal on the 1st line
30) tiger mouth & vital point
31) strange things, ko, throw in
32) diagonal on the 1st line
33) vital point
34) 6 space seki
35) crooked 4 nakade
36) placement and hane
37) bulky five
38) bulky five, throw in, seki
39) L+1
40) capture 3
41) capture 3
42) strange things, ko
43) recapture
44) shortage of liberties
45) strange things, ko
46) bulky five
47) recapture
48) sacrifice, shortage of liberties

Knotwilg · Post by **Knotwilg** » Tue Sep 06, 2016 5:13 am

49) door group
50) counting liberties
51) strange things | ko
52) rectangular six in the corner
53) rectangular six in the corner
54) 1st line connnection / weak diagonal
55) flying saucer
56) sacrifice; corner properties
57) counting liberties
58) strange things; counting liberties
59) throw in & ko
60) door group
61) vital point, shortage of liberties
62) vital point
63) throw in, shortage of liberties
64) vital point, shortage of liberties
65) (missed it)
66) shortage of liberties
67) (missed it)
68) miai, shortage
69) stretch to increase/reduce liberties
70) eye in the belly
71) shortage
72) strange, shortage, miai

Knotwilg · Post by **Knotwilg** » Wed Sep 07, 2016 3:38 am

73) vital point, shortage
74) death in the hane, eye shape, reading
75) vital point, ko
76) vital point, ko
77) vital point, ko
78) first line descent
79) vital point, ko
80) vital point, ko
81) comb, vital point
82) comb, vital point
83) under the stones
84) fix weak point
85) vital point
86) first line diagonal, ko, net
87) shortage
88) shortage, miai (missed it)
89) sacrifice, liberties
90) clamp
91) throw in, force
92) first line diagonal
93) nakade
94) vital point
95) vital point
96) vital point

3 missed after 96 problems, that's 1/32 or 3,125% wrong.

The elementary problems are sometimes trivial (1 known move), sometimes already reading exercises. For example, in problem 96 I really had to force myself to read properly. And it's when exploring the more brutal variations (reduce eyespace from outside, cut) that one discovers the vital point.

These are very good exercises to start a reading program. I'll try and complete 1000.

Knotwilg · Post by **Knotwilg** » Wed Sep 07, 2016 9:02 am

97) shortate of liberties
98) hane
99) crooked 4
100) eye in the belly
101) shortage
102) under the stones
103) vital point
104) throw in
105) strange, ko
106) descent first line
107) double snapback
108) nakade
109) nakade, ko
110) vital point
111) vital point
112) vital point
113) eye in the belly
114) shortage of liberties
115) shortage
116) bulky five
117) ko
118) diagonal first line
119) vital point, ko
120) descent first line

Knotwilg · Post by **Knotwilg** » Thu Sep 08, 2016 1:18 pm

121-144 without remarks. Some are real reading exercises, most just 1 variation to check.

Still good food.

Kirby · Post by **Kirby** » Thu Sep 08, 2016 2:00 pm

Knotwilg wrote:http://www.hitachi.co.jp/Sp/tsumego/igo1062/problems-e.html

The elementary problem is bizarre. White is dead already, or not?

Funny.

Knotwilg · Post by **Knotwilg** » Fri Sep 09, 2016 7:45 am

145-168

It helps me to post this, in order to keep up the tsumego rhythm.

Problems start to become repetitive in a gentle way. Best way to ingrain the knowledge, I guess.

Good thing would be now to focus on finding opportunities in games to take advantage of these tsumego.

Knotwilg · Post by **Knotwilg** » Fri Sep 09, 2016 5:01 pm

I completed the first 192 problems and then played a game. Would I see the difference? Would it matter?

Still too easy on tygem I think. But I won by a kill, so L&D problems may be paying off!

Knotwilg · Post by **Knotwilg** » Sun Sep 11, 2016 7:18 am

Based on the thread on studying relentless, I played another game on tygem, studied 24 more Hitachi go problems and replayed anotehr game by Otake:

attempt 1 - 3 tries for each move, then peek
attempt 2 - likewise
attempt 3 - 1 more try for each move and analyze the mistake

Remembering doesn't show understanding: sometimes I remember the moves which I don't understand. And it's the moves I understand which I want to play earlier than they're played in the actual game.

Here's the final analysis, including 18 misses out of 170 moves: 8 in the middle game and 10 in the endgame.

Knotwilg · Post by **Knotwilg** » Sun Sep 25, 2016 4:11 pm

Hitachi problems 241-264. This part is much more difficult than earlier ones and I missed several of them.
It will make sense to redo the whole series once I'm done with all 1000+ ...

I also replayed another Otake game.

Knotwilg · Post by **Knotwilg** » Mon Sep 26, 2016 5:06 am

Hitachi 265-288.

In another discussion, John F. questions the use of doing tsumego.

In my next few games, I'll make a mental note of when I'm reminded of any of these tsumego I did.

edit: I'm including a problem from the Hitachi collection

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

At first I found this problem very difficult. I couldn't find the vital point. My intuition drew me towards A or B. Then I got remineded about the fundamentals of L&D: expand eye space first.

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

I read this. White connects his stone. After

White needs to prevent a ko. One starts seeing a possibility.

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

Next I tried to prevent the connection with maximal expansion and read this. Black gets close to shortage of liberties but not close enough.

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

I tried to use

where White had played

and found life

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

We get a ko again.

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

Unfortunately, I didn't pursue this path of reusing the opponent's move because I got tired. I tried

and found the same ko, so I got convinced

was the solution.

Click Here To Show Diagram Code: [go]$$B ------------------------ $$ | . . a . . . . 1 O O . . $$ | . O X X X O 2 b X O . . $$ | . O O O X . X X . O . . $$ | . . . . X X X . . O . . $$ | . . . O O O O O . . . . $$ | . . . . . . . . . . . . $$ | . . . . . . . . . . . .[/go]

If I had continued and tried

here - which is where Black played

before, I would have seen that Black dies here. A and B are miai.

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

I would then have tried

at what has clearly turned out to be the vital point. It's not a very favorable ko for Black but it's his best possibility.

What am I trying to prove with all this?

- I will probably never encounter this shape in my games
- But I might encounter something similar and may think of the vital point faster
- Tsumego makes you practice the principle of trying the variation where you play where your opponent would answer, or vice versa.

Knotwilg · Post by **Knotwilg** » Tue Sep 27, 2016 4:46 am

Replay of an Otake Hideo game. After 5 iterations I know it by heart (the last two were needed to memorize the particular order of forcing moves).

Highlights:

Opening

10: White plays the unusual high move, presumably because the diagonal opening has disturbed symmetry and the top is important.
31: Black plays the unusual attachment, to stress the lower left corner, at the expense of White strength at the bottom, which is presumably overlapping

Middle game:

57: Black ignores a shape wrecking move to fasten the attack on White's invasion of the right side
61: Black activates a cutting stone in order to separate another White group and have two targets to attack
97: after the difficult to remember forcing exchange of 95-96 Black wants to weaken White's second group again, in order to continue the double attack. However ...
98: White counterattacks and weakens the group that separates the two
112: White connects his groups on a large scale after a few forcing moves.

Endgame:

135: Immediately Black goes for mutual damage
136: White "punishes" Black for his play elsewhere, in the most beautiful way of making equivalence. This is truly "the" highlight of the game.
170: after a long sequence of sente moves, a typical endgame consequence of Otake's thick style, Otake takes 2 stones and this is a declaration of victory for me
175: Black resists by playing a reverse sente move
192: in a grand display of fighting spirit, White lives with eyes instead of connecting on neutral points

Full review:

You will see here the compound variations of all 5 iterations to predict the moves, giving myself 3 attempts in the first two runs, 2 in the 3rd run and only 1 in the last two runs.

Knotwilg · Post by **Knotwilg** » Sun Dec 25, 2016 2:47 pm

Highlights: Black gets off a bad start but White plays a few soft moves and Black gets back into the game. I (Black) manage the middle game quite well and eventually play a tesuji to capture the cutting stones.

Anyone knows why this file is corrupt? COmes straight from cgoban.

Bill Spight · Post by **Bill Spight** » Sun Dec 25, 2016 3:06 pm

The file contained a number of [1d]s. I removed the brackets.

Life In 19x19

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