Extra handicap stones can be added according to the diagrams below. I think this might be the Chinese pattern. (The Japanese pattern is given below). Most people who need such handicaps would probably prefer to play small board Go such as 9x9 and 13x13.
Table of contents | Table of diagrams Handicaps up to 17 Handicaps up to 25 Japanese Handicap stones Gene Fellner, stones 1-25 25 stones, another variation Handicaps up to 29 Gene Fellner, stones 1-41 |
Handicap stones 10 through 17 are at R13, C7, N3, G17, N17, G3, C13, and R7.
Handicaps 18 through 25 are at R17, C3, C17, R3, N13, G7, G13, and N7.
In fact a game Nemesis vs Janice Kim almost 20 years ago at this handicap is recalled.
Rich: Robert Jasiek's page shows the official Japanese rules for placement of handicap stones. They agree in large part with the diagram, although they don't have the 10-3 points.
Gene Fellner, USA, 1965:
10-13: G7,G13,N7,N13 14-17: C3,C16,R3,R16 18-25: D7,D13,G16,N16,Q7,Q13,G4,N4 26-29: J3,C10,J17,R10 30-33: F6,F14,O6,O14 34-41: C7,C13,G17,N17,R7,R13,G3,N3
[erratum?: K3, K17 instead of J3, J17?]
Crimson: I'm sure I saw that somewhere. Is it impractical, or why isn't it listed here?
Handicaps 26 through 29 are at K13, K7, N10, and G10.