The Exchange: Three for Six, Territory for Power

Standard

title

Have you ever made an exchange, i.e. sacrifice a group so you can capture one of the opponents? This is an interesting game where Brown Stone found a way to sacrifice stones in exchange for a bigger profit. Also, the opponent made a little trickery during counting.

1-8

Brwnstn played White. This is the first time for a long time that Brwnstn played as White.

White chose to aim for influence. Black had the same plan though, going for sanrensei.

variation-9

White expected this variation. Black builds influence on North East.

9-24

However, Black chose the wrong direction with 9. White was surprised with the double hane of Black 13. Maybe Black realized the mistake of Black 9 in the wrong direction. White thought Black 15 was too greedy. White’s connection at 20 was bad because of Black 21. Black’s East looked bigger than necessary despite Black’s mistake in handling the sansan.

variation-25

Maybe this variation is better for Black.

25-54

Black developing the South looked wrong. White 26 reduced the potential of Black’s East. White wanted to count after 28, but Black 29 forced White to forget counting for the meantime. This peep forced White again to use time for reading instead of counting. Black did not give White enough time to breath and relax. Black gave up on North and decided to build on South with 39. White thought the pincer works wells with the White 40. Black 47 leads to a joseki, but White was worried about the ladder.

variation-55

Since the ladder did not work for White, maybe this could be a possible variation.

55-82

However, Black chose a different variation. Up to Black 61, White was happy to build a wall on North. Black 63 forced White again to read instead of count. White felt bad about 74. After Black 75, White is now peeping on both sides of a bamboo joint. White 74 looked like a very inefficient move. Black 77 was very painful. Black 79 was doubly painful. White had to defend with 80. White 82 was aiming for an exchange with. White thinks the exchange would be good, but this move does not work.

variation-83

This loos like a better variation for Black. White has a lot to catch up.

83-93

Black 83 was a mistake. White A suddenly worked. 87 and 88 were miai.

variation-94

The sagari of White 1 is the correct reply. White stays connected.

94-101

Connecting was bad for White. White 96 aimed for another exchange, influence against Black’s profit. White 100 looked misplaced and limited White’s potential.

counting

Counting

Black (■) Pairs
North West – 13.5
North East – 8.5
South East – 11
South – 7.5 ~ 4
Total -37 + 6 Prisoners
White (▲) Pairs
North +Apex – 32.5
South West – 5.5
Total – 38 + 6.5 Komi

White had a slight lead of 1.5 points. White A looks very big now.

102-135

After Black 117, White A still looked like the bigger point. Black 121 was painful because it reduced White’s potential in the Apex. White 122 aimed at securing a big Apex. Black 123 looked alright, but Black 125 looked very small. After 132, White’s Apex looked very big.

counting-2

Counting

Black (■) Pairs
North West + Apex – 14
South East + East- 27.5
South – 5.5
Total -47 + 7 Prisoners

White (▲) Pairs
North +Apex – 42
South West – 6
Total – 48 + 6.5 Komi

White was still only ahead by 1.5 points.

135-214

Endgame began. White 136 does not look so big in hindsight, but it defended a possible tactic by Black to cut-off the two marked White stones. After White 202,  he game was over at this point, but Black’s stubbornness with 203 made White worry. Black died after White 212.

variation-215-a

variation-215-b

Either variation from above, White is safe.

214-218-final-count

White only captured the two stones because White counted to be ahead.

Counting

Black (■) Pairs
North West  – 10.5
South East + East + South -29.5
Total -40 + 10 Prisoners

White (▲) Pairs
North +Apex – 43
South West – 8
Total – 51 + 2 Prisoners + 6.5 Komi
White was ahead by 20.5 points. However, in the official result, White only won by 3.5 points because the Black North group was not considered as dead, but it is dead. White did not push the issue  because it was still a clear win for White.

summary

Black’s first mistake was playing in the wrong direction with A. White was not able to punish Black A after Black played the double hane of  B. White also felt good playing D that reduced Black’s moyo on East. Maybe Black C should be at D. Things became complicated when Black attached at E. White F became inefficient when Black played G. White had no choice, but to sacrifice the three White stones in H with the push at I. However, White I does not work, if Black played J at K instead. Another bad exchange for White happened when White connected at L instead of keeping the groups connected with M.  White’s group at N died. White P gave the lead back to White when Black made the slow move at O. In the endgame, Black lost the initiative when Black played Q. Black tried to like on North With R, but White killed Black and took the win. The counting was wrong. White won by 20.5 points.

Brwnstn needs to focus more on reading and direction of play and to reserve some time for counting to make the proper decisions. White F was the most annoying because White knew Black would play G. White did not evaluate the efficiency of peeping on both sides of the bamboo joint. Brwnstn was satisfied with the exchanges made in the game.

END

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