Two stars side - pattern 1

  Difficulty: Expert   Keywords: Opening
Uncommon pattern  

Although black+circle occupies an obvious big point, this formation isn't very common in pro games.

Black develops  

The popular move next for Black is B1. In answer White usually takes steps to limit Black's framework, for example at the marked points. Even though B1 isn't a rapidly developing play, it is quite urgent for White to pay attention to this area.

Black develops towards the centre  

The choice of B1 has been seen in recent years: it indicates that the original third line play black+circle was made in connection with the lower left corner, and that the left side is still important. The circle-marked point is now one vital point for both sides. White may also choose the square-marked point.

In these examples Black avoids trying for a double-wing formation based on 4-4:

Invitation to invasion  

It is considered that playing black+circle and black+square invites W1, an ideal 3-3 invasion.

Widest path  

Assuming White to play, this is the widest path sequence: effectively this is a joseki. That does assume that black+circle is a strong stone.

Approaching from the other side  

This choice of W1 is only appropriate when black+circle can become weak. That is, exactly when the exchange Black a- White b will cause Black trouble. Otherwise White would get a heavy group here, without much compensation.

See Two stars side - pattern 2 for the case in which black+circle is on the fourth line.

Charles Matthews

Two stars side - pattern 1 last edited by Stefan on June 20, 2003 - 15:09
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