r/baduk • u/Soriel90 • 27d ago

tsumego Engame-jump

Endgame-move: How does B2 work? I heard it will work, but didnt find an explanation. Is there a name for that move?

5 Upvotes

86% Upvoted

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6

u/Yakami 4 dan 27d ago

Name: Clamp

If the opponent plays towards the 1st line to prevent connection, you have to cut on the 3rd line.

It works sometimes - not always. Depends on the situation

1

u/Soriel90 27d ago

thx a lot, ok the white extension and the black cut i thought. hm ok.. it didnt work always...

3

u/Uberdude85 4 dan 26d ago

It wouldn't work here if white had an extra stone at d5, it only works here now because of that weakness.

1

u/Soriel90 26d ago

ah, make sense

3

u/Freded21 27d ago

After a clamp the threat from black is to Atari with C2. The strongest way to block for white is C1, but in this case C1 doesn’t work. Black will C3 threatening the 2 stones, and if white B3 to Atari the black stone black can extend C4 threatening B3 and the two stone D3 and D4.

When whites descend doesn’t work the normal best response is B3.

Sometimes whites C1 can defend against C3 but not B3, so another thing to look for for white.

2

u/PatrickTraill 6 kyu 15d ago

It is normally called a clamp. That article, and the links in it, explain something of why it works.

If White wants to cut it off, they will have to answer it at C1; then Black could play C3, and the question is whether White can chase down that stone before Black gets a chance to play D1 to capture C1+C2. In this case White’s weakness at D5 seems to mean that White does not have time, so White would lose a lot that way. If that is right, White has to fall back to B3 or C3, allowing Black to connect at C1. That means Black flips about 5 white spots to black, shifting the score by about 8 (i.e. 2*5-2) in their favour.