Solution

Problem 1. Be careful not to be seki (O1,M2,M3,L1,M1,N2 ).

Problem 2. Two gote -1-eye mean death. Even if  3 stones are captured, gote 1 eye ! (S5,S4,T7,T1,T2,Q1,T6)

Problem 3. Q3,Q2,S2,T2,R2,T3,T4

Problem 4. S1,R1,Q2,R2,P1,Q1,O1

Problem 5. K1,K12,.....