# Does the 3-3 invasion work with 3 stones already placed?

With the three black stones placed, I did the 3-3 invasion.

``````\$\$Wm1
\$\$ ----------
\$\$ ........|
\$\$ ...X....|
\$\$ ...X.1..|
\$\$ ....X...|
\$\$ ........|
``````

I tried tried to force a KO and did get 2 moves elsewhere, but I would rather have lived.

``````\$\$Wm1
\$\$ ----------
\$\$ ........|
\$\$ ...X..5.|
\$\$ ...X.O.7|
\$\$ ....X236|
\$\$ ......4.|
``````

Does 3-3 invasion work here?

Liam showed a good way to kill the invasion already, but you can be even more mean and play 2 at 4:

``````\$\$Wm1
\$\$ ----------
\$\$ ........|
\$\$ ...X....|
\$\$ ...X.1..|
\$\$ ....X...|
\$\$ ......2.|
``````

If white then plays 3, you just draw back instead of playing below 1, and you avoid a cut at 4:

``````\$\$Wm1
\$\$ ----------
\$\$ .....c..|
\$\$ ...Xb.a.|
\$\$ ...X.1..|
\$\$ ....X.3.|
\$\$ .....42.|
``````

Then, a, b and c are miai to kill.

The cut would not usually be dangerous, but it at least allows white to get 1 or 2 outside sente moves in the area, which is more than she should get - the original invasion at 3-3 was way too deep (the deepest possible would be white 1 at 2 in the above diagram, but that is a bit advanced, don't worry about it too much).

White may try to be sneaky and return to the variation with the cut present like this:

``````\$\$Wm1
\$\$ ----------
\$\$ ........|
\$\$ ...X....|
\$\$ ...X.1..|
\$\$ ....X...|
\$\$ .....32.|
``````

In that case, you can easily play at 6 instead of a to gain more and avoid white's sente atari at 6. The white inside group is still dead as per what we saw above.

``````\$\$Wm1
\$\$ ----------
\$\$ ........|
\$\$ ...X....|
\$\$ ...X.1a.|
\$\$ ....X45.|
\$\$ .....32.|
\$\$ ......6.|
``````

Black 6 should be at white 7. After this white dies uncondittionally.

https://online-go.com/demo/66482