Problem Set 3. Advanced

All problems Black to play

{{Dia 894}} {{Dia 895}}

{{Dia 896}} {{Dia 897}}

{{Dia 898}} {{Dia 899}}

The shoulderhit Black 1 settles the shape on the top side first. Both diagrams show Black in a position to block off the right side. 2

{{Dia 900}} {{Dia 901}}

The plain extension (left) is a good play. After it Black can attack on the right side. (Right) Black 1 here is heavy, and still leaves the cut at A behind.

{{Dia 902}} {{Dia 903}}

In this case Black should play tightly at the bulge point (left). After 5 White cannot hold the corner and defend the side. (Right) Playing in the corner is loose; Black needs 3 also.

{{Dia 904}} {{Dia 905}}

This is an example of weak shape for White. Black cross-cuts with 1 and 3, and is able to break in.

All problems Black to play

{{Dia 906}} {{Dia 907}}

{{Dia 908}} {{Dia 909}}

{{Dia 910}} {{Dia 911}}

The jump at the centre of three stones (left) is correct, leading to a ko. Black 11 is a local threat. (Right) Black plays into bad shape and trouble.

{{Dia 912}} {{Dia 913}}

Black should cut at 1, widening the field of action. In either variation Black 5 becomes a good play. Black 1 functions as a useful probe.

{{Dia 914}} {{Dia 915}}

The clamp Black 1 makes good shape. White’s attempts to cut Black thereafter are unfruitful: in either case up to Black 9 White is getting nowhere.

{{Dia 916}} {{Dia 917}}

The two-point jump at 1 is good in this case. The diagrams show two ways in which White’s attacks can be held off.

All problems Black to play

{{Dia 918}} {{Dia 919}}

{{Dia 920}} {{Dia 921}}

{{Dia 922}} {{Dia 923}}

The diagonal jump 1 sets up miai at A and 3 of the left-hand diagram.

{{Dia 924}} {{Dia 925}}

The knight’s move 1 sets up miai on the left and top sides.

{{Dia 926}} {{Dia 927}}

Black should make the solid staircase connection 1. Then Black can cut and fight White in good shape. (Right) White has this alternative way to play. Both these results are reasonable; what Black should not allow White is the chance to cut or play forcing moves.

{{Dia 928}} {{Dia 929}}

The contact play Black 1 works well for sabaki. In these two variations Black becomes strong.