Sacrifice a single stone on the second line 1

Nechanicky 5d - Guo Juan 7d  

This is taken from the 1996 Fujitsu Cup in Amsterdam.

intends to settle the group. But there is an order of play problem here. It turns out that Black should have played at a, forcing White b, before .

Crawl variation  

Black gets into trouble here, as White applies the crawl variation. With the Black a-White b exchange played out, at is possible.

Comment by Seong-june Kim 6d, from the unpublished book 'Fighting Fit'.

Charles Matthews