Dropping back problem 1 / Solution

White connects in sente  

W1 forces B2 to save the corner (White can get a ko to kill it). Then White plays tenuki here.

Dropping back  

The point being that B1 and B3 are sente plays now, but don't break through, an example of dropping back. Nothing difficult, with white+circle in place; but you have to see it in a real game to feel the force of it.

Going back to the start  

Assuming this came about as a result of the play white+circle here, B1 is required. After B3, can White take still take sente?

Going back to the start (continued)  

This is much more profitable for Black (next Black a and White will have to take the black+circle stones); so that in practice White may not be able to take, should play reverse sente.

In the real game the white+circle play was a bit more like an endgame tesuji.

Going right back to the start  

The way the problem was set makes this white+circle/black+circle exchange first look better.

Charles Matthews

Dropping back problem 1 / Solution last edited by Nico on September 3, 2003 - 10:52
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